| 1. |
- Adell, Anna, et al.
(författare)
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Open-access portal with hindcast wave data for Skåne and Halland
- 2021
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 77:2, s. 81-90
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Wave climate data for the Swedish provinces Skane and Halland, were hindcast using SWAN, a third-generation spectral wave model. The 40-year wave dataset, from 1979 to 2019, is made available through an open-access data portal (https://gis.sgi.se/vagmodell/). The wave data has a three-hour resolution and includes significant wave height, peak wave period, and wave direction. The wave model domain encompasses the Baltic Sea, Öresund, Kattegat, and Skagerrak. Along the coast of Skane and Halland, the spatial resolution of the computational nodes, from which data can be extracted in the portal, is 250 m. In the offshore areas, the resolution of the computational grid is coarser. The simulated significant wave height was validated against observations from 25 wave gauges, operating intermittently during the simulation period. The coefficient of determination, R2, for these comparisons ranged from 0.46 to 0.93 for the different stations. For 15 wave gauges, R2 values for the comparisons exceeded 0.80. The wave model will continuously be updated and developed.
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| 2. |
- Ahlman, Stefan, 1973
(författare)
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SEWSYS – ett verktyg för att bestämma källor till dagvattenföroreningar och pröva olika åtgärder
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:1, s. 39-48
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Dagvatten transporterar stora mängder toxiska ämnen till våra vattendrag. En substansflödesmodell har utvecklatsför att möjliggöra analys av scenarier relaterade till föroreningsminskande åtgärder och källkontroll.Datormodellen har fått namnet SEWSYS och innefattar generering och transport av föroreningar i urbanaavrinningsområden. Föroreningarnas källor är också beskrivna i modellen och inkluderar exempelvis materialkorrosion,bromsslitage och däckslitage. SEWSYS främsta egenskap är möjligheten att analysera föroreningaroch dess mängder utifrån de bidragande källorna. För närvarande hanterar modellen 20 olika substanser sominnefattar näringsämnen, metaller och organiska föroreningar. Det är möjligt att simulera både dagvatten ochhushållsspillvatten, antingen i kombinerade eller i duplikata avloppssystem. Modellens möjligheter demonstrerasi denna artikel genom ett urval av resultat från två tillämpade studier där SEWSYS använts för substansflödesmodellering.Baserat på den detaljnivå som modellen har i beräkningarna av dagvattenföroreningar ocherfarenheter från flera tillämpade studier har SEWSYS visats sig vara ett användbart verktyg för att simuleradagvattenföroreningar och utvärdera åtgärder som bygger på källkontroll.
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| 3. |
- Al-Najjar, Nasik
(författare)
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FRAMTIDA VATTENFÖRSÖRJNING FÖR VÄXJÖ KOMMUN : BEDÖMNING AV OLIKA ALTERNATIV
- 2008
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 63:4, s. 299-311
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Water supply in Växjö municipality has since 1887 been based on surface water from Helga lake. A water treatment plant was built in 1957 and was extensively reconstructed in 1969 but there are still problems to accomplish with drinking water quality, mainly related to temperature, smell and taste, managanese and aluminum rest. Present water consumption periodically approached the water treatment plant maximum capacity. A performed risk analysis showed that catastrophic consequences for the water supply could occur due to an accident in a nearby traffic route or discharges from an industrial area.In 1997 Växjö municipality decided to perform a comprehensive investigation of different alternatives for future water supply. Seven alternatives were evaluated including remedial measures at the present water treatment plant. The chosen alternative was based on supply and conveying ground water from Berga esker at Ljungby municipality. Re-infiltration of ground water will be used to guarantee required water quality and quantity and will be implemented in autumn 2008 with a planned supply of 200 l per second delivered to about 70.000 persons in the municipalities of Växjö and Alvesta. The article describes the different alternatives, motives for the chosen alternative and the evaluation procedure.
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| 4. |
- Al-Najjar, Nasik
(författare)
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The future water supply of Växjö municipality – evaluation of different alternatives
- 2007
-
Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 63:4, s. 299-312
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The water supply in Växjö municipality has since 1887 been based on surface water from Lake Helgasjön. A water treatment plant was built in 1957 and was extensively reconstructed in 1969 but there are still problems to accomplish with drinking water quality, mainly related to temperature, smell and taste, manganese and aluminium rest. The present water consumption has periodically approached the water treatment plant maximum capacity. A performed risk analysis showed that catastrophic consequences for the water supply could occur due to an accident in a nearby traffic route or discharges from an industrial area. In 1997 Växjö municipality decided to perform a comprehensive investigation of different alternatives for future water supply. Seven alternatives were evaluated including remedial measures at the present water treatment plant. The chosen alternative was based on supply and conveying ground water from the Berga Esker in Ljungby municipality. Re-infiltration of ground water will be used to guarantee the required water quality and quantity and will be implemented in autumn 2008 with a planned supply of 200 l per second delivered to about 70,000 persons in the municipalities of Växjö and Alvesta. The article describes the different alternatives, motives for the chosen alternative and the evaluation procedure.
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| 5. |
- Al-Najjar, Nasik, et al.
(författare)
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The water and wastewater situation in Iraq – problems and possibilities for counter-measures
- 2004
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 60:4, s. 269-274
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A summary is given of the water and wastewater situation in Iraq before the Gulf War 1991, the situation after the Gulf War and the recent effects of the conflict in 2003. The access of safe water was halved in certain governorates after March 2003 and half of the sewage works were out of function with a discharge of untreated wastewater into rivers and channels. The supply of electricity was less than 4 hours per day in January 2004 and caused discharges of untreated sewage on streets etc. The leakage from the water net was estimated at 60%. The wastewater system in 3 out of 5 schools was estimated to be out of function and epidemics have especially affected children and caused increased mortality. Special issues like the illegal openings of water pipes and security have worsened the situation. The Swedish knowledge of water and wastewater handling may have an important role in rebuilding water and wastewater handling in Iraq and different possibilities are exemplified.
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| 6. |
- Al-Najjar, Nasik, et al.
(författare)
-
VA - SITUATIONEN I IRAK : PROBLEM OCH MÖJLIGHETER TILL MOTÅTGÄRDER
- 2004
-
Ingår i: VATTEN: Tidskrift för vattenvård. - : Föreningen Vatten. - 0042-2886. ; 60:4, s. 269-274
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A summary is given on the water and wastewater situation in Iraq before the Gulf war 1991, the situation after the Gulf war and the recent effects of the conflict 2003. The access of safe water was halved in certain counties after March 2003 and half of the sewage works was out of function with a discharge of untreated wastewater to rivers and channels. The supply of electricity was less than 4 hours per day in January 2004 and caused discharges of untreated sewage on streets etc. Leakage from the water net was estimated to 60%. The wastewater system in 3 out of 5 schools was estimated to be out of function and epidemics have especially affected children and caused an increased mortality. Special issues as illegal openings of water pipes and security have worsened the situation. Swedish knowledge in water and wastewater handling may have an important role in rebuilding water and wastewater handling in Iraq and different possibilities are given.
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| 7. |
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| 8. |
- Aljaradin, Mohammad, et al.
(författare)
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Evaluation of using grey water as an alternative irrigation source in Jordan
- 2011
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 67:2, s. 119-122
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Tidskriftsartikel (refereegranskat)abstract
- One option for coping with wasteful uses of fresh water in landscape irrigation is to use the treated greywater(GW). In the present study, an evaluation of a simple treatment system for reusing GW to irrigate green areas,trees, and ornamentals all over the campus in Tafila Technical University (TTU), Jordan, is presented. After 12 months of using the treatment system, the necessity for using fresh water as irrigation source was reduced. Meanwhile, the area of tree covered land increased from 2.3 ha to 8.4 ha and a 0.5 ha grass areas were introduced in the campus area. In conclusion, the use of a GW as alternative irrigation source is considered an effective method for saving fresh water and increasing green area at the campus.
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| 9. |
- Amofah, Lea Rastas, et al.
(författare)
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Nutrient recovery in a smallscale wastewater treatment plant in cold climate
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:4, s. 355-368
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An onsite wastewater treatment plant at Brändön, north of Luleå, receiving primarily treated wastewater from a village, was operated and investigated during one year. The wastewater flow was 0.5 m3/d. The main treatment steps were a prefilter, mainly to distribute the flow, a vegetation filter consisting of two different clones of Salix and two phosphorus filters with Filtralite-P and blast furnace slag (BF slag) operated in parallel. The willow bed reduction of BOD7 was in average about 80% and of phosphorus (P) and nitrogen (N) 20-30%. The main mechanism was believed to be filtration in the bed. The reduction through plant uptake was minor. The Filtralite-P filter reduced BOD7, P and N with 67%, 72% and 20%, respectively. The BF slag filter reduced P and N with 53% and 3%, respectively. The release of sulphuric compounds from the BF slag filter increased the BOD7 content in the effluent. The Filtralite-P system achieved the requirements of the normal protection level given by the Swedish Environmental Protection Agency but not all of the requirements of the high protection level. The BF slag system did not fullfil the requirements of the two protection levels.
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| 10. |
- Andersson-Chan, Anneli, et al.
(författare)
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Odorous wastewater emissions
- 2006
-
Ingår i: Vatten. - 0042-2886. ; 62:3, s. 227-236
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this article is to review odour problems of wastewater treatment facilities and air emission treatment methods. The malodorous wastewater emissions consist of a complex mixture of substances with different properties. A screening of volatile organic and reduced sulphur compounds revealed very low concentrations of individual compounds (< 50 ppb), and only dimethyl sulphide, hydrogen sulphide and methyl mercaptan were found at concentrations above threshold values. Indicating one single compound responsible for the foul odours was not possible. Two case studies are presented and discussed. In the first, a compact biofilter was evaluated for the treatment of gas streams from a sewage pumping station. A rockwool filter media was inoculated with a mixed bacterial wastewater culture that established successfully. However, evaluating the biofilter's performance proved analytically difficult and expensive due to the low concentrations of incoming gases. In the second case study the odour nuisance situation around a wastewater treatment plant was evaluated and a holistic approach to manage the odour problems was developed. An odour panel of local observers worked well, since they got involved in the process. However, using the panel's reports on odour episodes to find the source of the odour was difficult.
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| 11. |
- Andersson, Sandra Andersson, et al.
(författare)
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Undersökning av kalciumkarbonatförekomsten i Vombfältet
- 2015
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 71, s. 17-26
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- In a study of the neutralization capacity and limestone content the artificial recharge area of the Sydvatten waterworks Vombverket in Vomb, Skåne, five samples from different locations in the area was collected, sieved and acidified with hydrochloric acid. The neutralization capacity measured as calcium carbonate content was found to vary in the different sandy soil samples but was generally high (about 2–14 % by weight). The total mass of calcium carbonate in the infiltration area was determined taking into account the volume and density, i.e. possible porosity of the soil. There is at least equal to 4.3 million tons of calcium carbonate present in the infiltration area. This corresponds to a neutralization capacity of 88 x 109 moles in the study area. The annual limestone dissolution in the area is about 750 tons. The limestone content in the area is generally high and has a good ability to buffer also more acidic water than water from Vombsjön. At present limestone consumption, the neutralization capacity lasts for at least 5700 years.
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| 12. |
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| 13. |
- Arnell, Magnus, et al.
(författare)
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Balancing effluent quality, greenhouse gas emissions and operational cost - developing dynamical models for intergrated benchmarking of wastewater treatment plants
- 2012
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 68:4, s. 295-302
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Tidskriftsartikel (refereegranskat)abstract
- The scope for wastewater treatment plants (WWTPs) widens to consider not only water quality and cost, but also energy efficiency and greenhouse gas (GHG) emissions. The on-going research project, “Development and dynamic analysis of operational strategies for enhanced energy efficiency of wastewater treatment systems” aims to develop a tool for integrated evaluation of energy efficiency and greenhouse gas (GHG) emissions with effluent quality and operational costs. The tool will build on the comprehensive Benchmark Simulation Model no. 2. It will be extended with models for: i) production and emission of CO2, N2O and CH4 and ii) calculation of energy consumption and production at the plant. Here, a first attempt is presented together with a case where different set-points of dissolved oxygen, DO, in the aeration-tanks are simulated. The simulation results show that lowering the DO set-point from 2 mg l–1 to 1 mg l–1 reduces the CO2-emissions by 570 kg d–1, a reduction from 30,500 kg CO2 d–1 emitted from the plant at 2 mg DO l–1. However, at the same time this slightly increases the effluent discharge. Moreover, due to increased nitrite accumulation in the aeration tank, the N2O emissions increase by 12,500 kg carbon dioxide equivalents, CO2e d–1, which dramatically exceeds the reduction due to lowered power generation. Accordingly the total GHG-emissions are reduced by an increase of the DO set-point to 3 mg l–1, but the reduction is insignificant and the increased operational cost disproportional to the improvements in the emissions. The conclusion is that, to meet multi-objective goals, integrated benchmarking of the three criteria is essential.
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| 14. |
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| 15. |
- Bashitialshaaer, Raed
(författare)
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Desalination and Brine Discharge Case Study for PEAW in Oman
- 2016
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 72:1, s. 41-47
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Desalination is an important method for producing drinking water and it has been a freshwater supply alternative for a long time. The water resources in the Gulf Cooperation Council (GCC) countries, are mostly depending on desalination as a major source of (>80 %) drinking water, while the rest comes from groundwater. The largest number of desalination project is located in the Gulf countries (Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain and Oman) which today counts for more than 45 % of the world production, of this amount about 3 % total Omani production. The International Desalination Association (IDA), Award Program (2014–2015) was designed to facilitate the advancement of global expertise in desalination and water reuse through the exchange of talents, knowledge and skills. This was awarded for the author at Public Authority for Electricity and Water (PAEW), as the host agency in Oman for six weeks. PAEW performs studies and explores and evaluates multiple techniques for providing fresh water and power production to various consumers; residential, industrial and commercial. Oman has several desalination plants, both small (smallest about 100 m3/d) and large size (largest about 200,000 m3/d) which are controlled by the PAEW. In the program lecturing, discussions and field visits were conducted to assist the host agency PAEW in Oman.
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| 16. |
- Bashitialshaaer, Raed, et al.
(författare)
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Mixing Time for the Dead Sea Based on Water and Salt Mass Balances
- 2010
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 66:1, s. 55-66
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Tidskriftsartikel (refereegranskat)abstract
- Water and salt mass balances for the Dead Sea were modeled. Precipitation, evaporation, river discharges, ground water flows, input/output from potash companies and salt production, and brine discharge were included in the models. The mixing time in the Dead Sea was modeled using a single-layer (well-mixed) atwo-layer (stratified) system.Using the single-layer approach the water level was predicted to change from 411 m below mean sea level (bmsl) (in 1997) to 391 m and 479 m bmsl (in 2097) based on water mass balances including and excluding brine discharge, respectively, and to reach 402 m and 444 m for the two cases based on a salt mass balance.In the two-layer approach the water level after 100 years was predicted to change from 411 m bmsl (1997) to 397 m and 488 m for a water mass balance including and excluding brine discharge, respectively, and to reach 387 m and 425 m for the two cases using a salt mass balance.The water mixing time using the single-layer description increased from 58 to 116 years when excluding brine discharge. Using the two-layer approach the exchange or mixing time increased in both layers, when adding brine discharge to the system, from 1.2 to 1.7 years and 11 to 15.3 years in the upper and lower layers, respectively. Good agreement was found between the models and historical data.
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| 17. |
- Bashitialshaer, Raed, et al.
(författare)
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Worldwide Oil Prize, Desalination and Population Growth Correlation Study
- 2009
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 65:1, s. 37-46
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, the investment in new desalination capacity, expressed as daily production capacity, was studied as a function of oil production and population increase for a large group of countries for the last 25 years. These countries were selected for their large desalination production and Sweden presented as reference. Oil production correlated well with investments in new desalination capacity. On a yearly basis, the correlation was about 78 %, but taking into account the time needed from investment decision to inauguration of new desalination plants, the correlation increased. The world oil production two years prior inauguration correlated to 88 % with new world desalination capacity during the entire study time.The total population for the studied countries was compared to the world population. In 1950, about 69 % of world population lived in the chosen countries, decreasing to 63 % in the year 2008 and according to population prognosis continues to decrease to 56 % in the year 2050 with occupied area of about 52 %. The totaldesalination capacities of these countries are slightly increased from 88 to 92 % in 1996 and 2008 respectively, and decreased to 90 % at 2050.Increased desalination capacity means increased energy demand. To a large extent, the energy costs are site specific as are the costs of labour and capital, but the reported water price was about 2.5 US $/m3 desalinatedwater until the 1980s, decreasing to roughly US $1.5/m3 in the early 1990s and to about $0.50/m3 in the late 2003.
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| 18. |
- Bengtsson, Lars
(författare)
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De första stegen mot grundandet av Lunds universitet - Tåget över Bälten.
- 2017
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 73, s. 19-24
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The Swedish army marched 1658 over the ice on the Danish sounds from Jutland to Zealand. An event that led to the foundation of Lund University in 1666. From the loads involved the ice thickness can be determined to have been at least 20 cm. Using data from mid-17 hundreds and forward the ice thickness of every year is computed. Large ice thickness seems to have been more common in the period mid 17 hundreds to mid-18 hundreds than for the next 100 year period. The computations are repeated assuming colder temperatures in the 16 hundreds than for the period 1760–1860. While the probability that the ice today is 20 cm a certain year is very low, the probability in the 17th century should have been somewhat less than 20 %.
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| 19. |
- Bengtsson, Lars
(författare)
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Extrema dygnsregn och trender i Skåne och Vädtkusten
- 2008
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 64, s. 31-39
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Series of daily precipitation including 89 years from Malmö, Halmstad and Göteborg have been analyzed aswell as daily precipitation from 230 stations in Skåne in the period 1961–1990. The distribution in space andtime has been investigated, and also the relation between daily rainfall and different parameters. The mostextreme independent events have occurred rather evenly distributed over Skåne, although there is a weak relation between high daily precipitation and annual precipitation. Different frequency distributions have beenattempted. The most extreme observed daily precipitation amounts can not be fitted to any statisticalfrequency distribution. The return period of daily precipitation near 100 mm is very long. Trends have beeninvestigated. It is for the long time series over 89 years not possible to find any trend of changing annualhighest daily precipitation. However, there have been trends over shorter periods
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| 20. |
- Bengtsson, Lars, et al.
(författare)
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Intensiva regn i Malmö
- 2008
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 64, s. 291-304
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Short-term intensive storms of duration up to an hour the years 1980–2007 from rain gauges in Malmö havebeen analyzed to find intensities of long return periods. Non-dependent observations from different stationshave been combined into a series to which probability functions have been adjusted. The extreme events havebeen investigated individually. The reliability of rain measurements is discussed. In order to investigate whetherrain intensities are different today compared to back in time, new and old rain data have been compared. Trendsover the last 20–25 years have been computed for two stations. It is found that 10–25 year long rain series fromsingle stations are too short to give good estimates of rains of long recurrence time, since a single event influ-ences very much. However, there is a good fit to theoretical distributions if data from many stations are com-bined; the number of station year increases. The largest observed rains in Malmö in the investigated period havea return period of about 100 year. Rains of shorter return period than 10 year can be given as a simple relationof duration and return period. Rain intensity curves 50 years old do not differ much from those derived fromnew data. It is not possible to draw any conclusions about trends
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| 21. |
- Bengtsson, Lars
(författare)
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Inverkan av värmeuttag på temperatur- och cirkulationsförhållanden i istäckta sjöar
- 1982
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Ingår i: Vatten. - 0042-2886. ; 38:1, s. 3-16
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Three different circulation mechanisms are analyzed: 1) through-flow of a river; 2) wind generated oscillations; and 3) convective currents induced by heat flow from the bottom sediments. The through-flow takes place between the ice and a depth, which is mainly determined by the conditions at the inlet of the river into the lake. Just below this depth there is a sharp thermocline. The water mass below the thermocline is hardly affected at all by the through-flow. The bottom currents generated by the heat flow from the sediments is found to be of the order up to some tenth of metres per day. The stream velocity is shown to be proportional to the heat flow rate to the power 1/3. In discussing expected effects of withdrawal of heat from ice covered lakes with and without through-flow and heat with drawal with closed and open systems are disinguished. A thermocline is likely to develop also in lakes with no through-flow. The layer close to the ice with a temperature of almost 0 degree C must increase during the course of the winter.
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| 22. |
- Bengtsson, Lars
(författare)
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Magrör : ett konservationsprogram för beräkning av dagvattenflöden
- 1980
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Ingår i: Vatten. - 0042-2886. ; , s. 325-336
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A conversational program, MAGROR, for storm water run-off is described. Such programs are necessary for practical engineering purposes related to storm water run-off. The program will assess storm water run-off and recommend optimal pipe dimensions. The program has an automatic capability. The principle of a connecting system for run-off piping is shown schematically. Theoretical considerations are also presented, including Manning's and Chezy's formulae. A special snow-melt routine is also included. Other systems, SWMM and ILLUDAS, are also discussed and compared with MAGROR
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| 23. |
- Bengtsson, Lars
(författare)
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Regn i Båstad
- 2023
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; :1-2, s. 61-70
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- On 18 August 2022, an extremely very local 45 minutes storm fell over Båstad. There are several observations close to or more than mm. In the summer 1937 there was a famous long-lasting rain, for which the daily value was 150 mm. During the summer 2007, there were many large rainstorms of around 75 mm. I compare the short-term 2022 storm with other large storms observed in Sweden, and I do the same with daily rains. It seems that extreme storms happen randomly and can occur almost anywhere in Sweden. The August 2022 storm is the probably most extreme 45-minutes storm ever occurred in Sweden, although one must be uncertain about how intense it was. However, rain statistics for Båstad do not show that the probability of large storms are higher than at other places.
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| 24. |
- Bengtsson, Lars
(författare)
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Runoff from green roofs
- 2002
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 58, s. 245-250
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Tidskriftsartikel (refereegranskat)
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| 25. |
- Bengtsson, Lars
(författare)
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VA-HANTERING OM 10 år
- 1994
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 50:4, s. 364-369
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Tidskriftsartikel (refereegranskat)
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| 26. |
- Bengtsson, Lars, et al.
(författare)
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Öppen dagvattenavledning i Augustenborg
- 2004
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 61:3, s. 163-171
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 27. |
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| 28. |
- Berndtsson, Ronny, et al.
(författare)
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Climate change and transboundary water management in the Tunisian Mellegue Catchment
- 2017
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; :4, s. 131-144
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Human activities and climate change affect hydrological and sedimentological characteristics within catchments. For arid and semiarid areas this induces direct negative economic and environmental consequences on society. In fact, stability in the rainfall regime and less siltation trapped in reservoirs mean more water for irrigation, water supply, and better flood control. This is especially important in the Tunisian semiarid region where water needs are close to potential water resources and siltation is reducing the reservoir capacity rapidly. Wadi Mellegue was chosen in order to study trends of water resources availability. Linear regression modelling and Mann-Kendall tests were performed for trend analysis. The study dealt with rainfall, discharge, and sediment patterns in the catchment area during a 44-year period. The results display a common decline in rainfall depth at different time scales. However, a positive trend related to discharge and siltation process was found. An increase in vulnerability to the new climate conditions is described. Consequently, water resources and agricultural landscape management for the Mellegue catchment should be revised in order to ensure a sustainable up- and downstream catchment development.
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| 29. |
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| 30. |
- Berndtsson, R., et al.
(författare)
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The effects of storm water on Lake Vaxjosjon
- 1989
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 45:2, s. 167-173
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The aim of the present study was to determine the pollution load originating from storm water on Lake Vaxjosjon. Each year about 1,050,000 m3 of storm water are discharged into the lake. Storm water represents a substantial pollution source for the lake and therefore also a main reason for the hypertrophic conditions in the lake. In order to evaluate the effects of the discharged storm water on the ecological conditions in the lake, an investigation was carried out using available information on storm water quality together with complementary sampling and flow measurements. Two different time scales were considered to be important: a short time scale for evaluating effects on the receiving waters due to shock loads of toxic substances (hours and days) and a long time scale for evaluating the effects of nutrients (years). In order to investigate effects concerning the short time scale, a computer-based runoff model was used. For the long time scale a daily precipitation series from 1970 to 1983 was used. The results showed that approximately 37% of the annual load of total phosphorus and 70% of the annual load of total nitrogen originate from storm water. Also a considerable portion of the annual heavy metal load originates from storm water (zink 51%, copper 55%). The annual total phosphorus load on Lake Vaxjosjon is 0.63 g/m2 lake area and year. The storm water part represents a phosphorus load equal to 0.23 g/m2 lake area and year. The acceptable load of phosphorus, for mesotrophic conditions in the lake, is about 0.2 g/m2 lake area and year. In order to improve the water quality in Lake Vaxjosjon sediment dredging of the bottom sediments needs to be undertaken. The sediments consists of an organic rich, phosphorus and nitrogen accumulated, black, anaerobic deposit, causing internal nutrient loading during summer periods.
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| 31. |
- Bjerkén, August, et al.
(författare)
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Evaluating GIS based water budget components applicability and availability for the Lagan River catchment
- 2021
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 77:4, s. 229-238
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Using open-access data sets on water and soil from Swedish authorities and compiling them in a QGIS-programme made it possible to present and visualise the water budget of the Lagan River Catchment. Based on the estimations of the water volume in groundwater reservoirs and lakes the total maximum available volume in the Lagan River Catchment area was determined to be 9.36 km3. Of this 75.9% (7.10 km3) is found within groundwater reservoirs and 24.1% (2.26 km3) is present in lakes. This study indicates that GIS-based parameters are useful for specifying what a water budget in a catchment area looks like.The use of GIS-based parameters also allows for the development of interactive maps which can be used to visualize different conditions in the catchment area. In addition, many people who work with water management have a good habit of using GIS tools. Utilizing open data sources means that the number of additional measurements can be kept low. Furthermore, the use of open sources contributes to increased transparency in the development process
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| 32. |
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| 33. |
- Bontje, Lotte E., et al.
(författare)
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COASTAL EROSION AND BEACH NOURISHMENT IN SCANIA AS ISSUES IN SWEDISH COASTAL POLICY
- 2016
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 72:2, s. 103-115
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I den här artikeln diskuteras kustpolicyförändringar i Sverige och deras dynamik, med stranderosion ochstrandfodring som exempel. Analysen baseras på Multiple Stream – modellen, som är en teoretisk modell förpolicyutveckling och agendasättning, utvecklad av samhällsvetaren John Kingdon (1984, 2003). Kustskydd ärinte ett separat policyområde i Sverige; åtgärder för att skydda allmän kust är ofta en del av den fysiska planeringen som till största del är en kommunal angelägenhet. Vår analys bekräftar att kustskyddsåtgärder verkligen organiseras på lokal nivå, av markägare och kommuner som drivs av en djup probleminsikt. Denna probleminsikt ger också upphov till ett lokalt engagemang som verkar för ett större erkännande av kusterosionsproblemen på regeringsnivå. Även om kusterosionsproblemen under det senaste årtiondet har letat sig in på flera policyagendor och erfarenheterna av Sveriges första storskaliga strandfodring har varit i huvudsak positiva, så har fortfarande inte något »policyfönster» öppnats som kunnat leda fram till någon betydande förändring på regional eller nationell nivå.
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| 34. |
- Bryhn, Andreas C., 1971-, et al.
(författare)
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Variabilities and uncertainties in key coastal water variables as a basis for understanding changes and obtaining predictice power in modelling
- 2008
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Ingår i: Vatten. - 0042-2886. ; 64, s. 259-272
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Tidskriftsartikel (refereegranskat)abstract
- The focus of this work is on general patterns in uncertainty as well as temporal and spatial variability in keywater variables in coastal science and management. These patterns are essential since they regulate how manysamples must be taken to get reliable mean or median values characterising coastal water quality and whichvariables are most suitable for monitoring and predictive modelling. We present results concerning coefficientsof variation, correlations, regressions, variations in data from different time periods, and confidence intervalsfor empirical mean values. We use data from Ringkøbing Fjord (Denmark, N. Europe), Chesapeake Bay(Eastern U.S.) and other coastal marine sites to illustrate the basic principles related to patterns in variability.We have shown that total and particulate N and P generally have much lower coefficients of variability (CV)than dissolved inorganic nutrient fractions. The latter are, hence, of limited use in predictive models for coastalmanagement. Total nitrogen (N) and phosphorus (P) were, on the other hand, found to be useful predictors oftwo standard bioindicators, the Secchi depth (a measure of water clarity) and chlorophyll-a concentrations(a measure of phytoplankton biomass or production)
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| 35. |
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| 36. |
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| 37. |
- Czemiel Berndtsson, Justyna, et al.
(författare)
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Gröna taks påverkan på dagvattenkvalitén
- 2005
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 61:2, s. 115-122
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 38. |
- Czemiel Berndtsson, Justyna, et al.
(författare)
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Vattenöversikt i små avrinningsområden i Skåne
- 2007
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 63:3, s. 231-244
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 39. |
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| 40. |
- Davidsson, Åsa, et al.
(författare)
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Pre-treatment of wastewater sludge before anaerobic digestion - hygienisation, ultrasonic treatment and enzyme dosing
- 2006
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 62:4, s. 335-340
-
Tidskriftsartikel (refereegranskat)abstract
- Pre-treatment of sludge before anaerobic digestion can increase methane production and degradation of organic matter. There are various pre-treatment methods for this purpose. Anaerobic digestion tests were performed for comparison of three pre-treatment methods (hygienisation, ultrasonic treatment and enzyme dosing) used separately or in combination on biosludge and mixed sludge. COD solubilisation and methane potentials from the differently pretreated sludges were used for comparison. Pilot-scale digestion was further used for evaluation of hygienised/untreated mixed sludge in semi-continuous operation. The results show that pre-treatment of biosludge leads to increased methane potential, especially hygienisation and ultrasonic treatment. Combining enzyme dosing with hygienisation or ultrasonication implies additional increase in methane potential while hygienisation combined with ultrasonication does not. Increased COD solubilisation seen after pre-tretment does not always bring about an increase in methane potential. On the other hand, pre-treatment methods like ultrasonication can lead to higher methane production although the COD solubilisation is low.
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| 41. |
- Dlugolecka, Maja, et al.
(författare)
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Low concentrations of high prority : pharmaceutical and personal care products (PPCPs); occurrence and high removal at wastewater treatment plant
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:2, s. 139-148
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Development of advanced analytical tools and analysis of wastewater samples confirmed the presence of residualamount of pharmaceuticals in environment and WWTP effluent in many European countries. Significantamount of compounds (30–90 % of administrated dose of antibiotics) is transported as active substance viaurine. Only some part of taken drug dose is metabolized by organisms and the rest is excreted in changed orunchanged form. Many non-target organisms, that could share some receptors with humans, could be exposedon pharmaceutical activity. Another important issue discussed is the combination of additive, synergistic andantagonistic effect that might reveal in the mixture of pharmaceutically active compounds introduced to theenvironment. The objective of this paper is to give the overview of recent published data concerning PPCPs. Inorder to find the efficient technology for removal of residual amount of pharmaceuticals the studied methodsand solutions are presented. The most interesting removal system is based on membrane technology. Separationof micropollutants onto membrane surface gives satisfactory results in experiments. A polishing step seems tobe also a very attractive technology for treatment of biologically active substances that pass all the precedingsteps in conventional WWTP s.
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| 42. |
- Dlugolecka, Maja, et al.
(författare)
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Two years of experience with semitechnical scale membrane bioreactor (MBR)
- 2007
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Ingår i: Vatten. - 0042-2886. ; 63:1, s. 69-78
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Tidskriftsartikel (refereegranskat)abstract
- In wastewater treatment applications the MBR technology combines biological treatment and a membrane systemto provide organic and suspended solids removal. Installation of low-pressure membranes within a biological reactor system replaces sedimentation, screening and media filtration as means of separating mixed liquorsuspended solids (MLSS) from treated wastewater. This study is focused on experiments with ZeeWeed10™MBR (Zenon GmbH) installed at the outlet of the main process line at Himmerfjärden WWTP, situated inGrödinge (south of Stockholm, Sweden). Results obtained for the MBR tests showed effluent water qualityimprovement in comparison with the full-scale plant performance with efficiency from 12 % removal efficiencyfor total nitrogen to 100 % for MLSS. Additionally, Design of Experiments methodology (Modde 7), wasappliedfor evaluation of fouling phenomenon in order to optimize the ZeeWeed10™ operation. 35 l m–2 h–1of flux and 7 minutes filtration with 40s of backwash were found as the optimal effective permeation conditionsfor the MBR process. The permeation fouling rate (PFR) was chosen as the major criterion that illustrates themembrane fouling occurrence and shows the necessity for membrane cleaning procedure. Furthermore, thecomparative studies of two membrane units (ZW500 and ZWNEW) were completed with an emphasis on fouling occurrence and indicated the ZWNEW as more fouling-resistant.
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| 43. |
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| 44. |
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| 45. |
- Ekelund, Nils, et al.
(författare)
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Flagellaten Euglena gracilis rörelseförmåga kan avslöja graden av giftighet (kadmium) i vatten med hjälp av metoden ECOTOX. (Orientation of the flagellate Euglena gracilis can identify the toxicity (cadmium) of water using the automatic biotest ECOTOX).
- 2004
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Ingår i: Vatten. - 0042-2886. ; 60:2, s. 77-84
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Tidskriftsartikel (refereegranskat)abstract
- The interest in testing of water and wastewater for toxic compounds has increased in the last few years with rising pollutant levels from industry and with rising sensibility towards environmental problems. In order to get an early warning signal of environmental conditions the use of unicellular organism are recommended since they respond quickly and are easy to handle. An early warning system, called ECOTOX, for monitoring of water quality has been developed by a research group in Germany (Prof. D.-P. Häder). ECOTOX use movement parameters of the flagellate Euglena gracilis as orientation in the gravity field, the motility and the velocity of the cells. These parameters have been found to be sensitive to toxic compounds. In the present study it was shown that cadmium affect gravitaxis, motility, velocity and compactness of the cells negatively in the concentration interval of 10 to 15 mg l-1 after 24 and 48 h. After short time of incubation (minutes) with cadmium there is an inhibition of the different movements parameters starting at the concentration of 25 mg l-1. Like other biomonitoring systems ECOTOX can be used to detect changes in quality of aquatic systems.
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| 46. |
- Ekelund, Nils
(författare)
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Hur påverkar klimatförändringar sjöar och hav? = The potential effects of global climate change on oceans and lakes
- 2012
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Ingår i: Vatten. - : Föreningen för vattenhygien. - 0042-2886. ; 68, s. 155-160
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I samband med de pågående klimatförändringarna så sker även en temperaturhöjning i sjöar och hav. Islossningen sker tidigare i sjöar vilket innebär att växtsäsongen för växtplankton blir längre och att perioden för skiktning kan förlängas. Dessutom kommer troligen artsammansättningen av växtplankton att förändras. Enligt klimatmodeller innebär detta att blå-grön alger börjar sin tillväxt tidigare på våren när temperaturen ökar. Effekter av klimatförändringar på marina ekosystem relaterar till förändringar av havstemperaturen, cirkulation av havsströmmar, skiktningsförhållanden, näring och pH. En ökad havstemperatur ger sedan som följd en höjd havsnivå, en minskad mängd havsis i Arktis och Antarktis, en ökad skiktning av havet, ett förändrat mönster av havsströmmar och ett förändrat inflöde av färskvatten till haven. En av effekterna vid en minskning av havsisen kan bli ett ökat ljusinflöde ner på djupet i havet som i sin tur ger en ökad primärproduktion. Emellertid kan denna ökning av primärproduktionen eventuellt begränsas av näringstillgången. I tropiska vatten är korallekosystemen väldigt känsliga för små förändringar i temperaturen. En ytterligare effekt från en ökad koldioxidhalt i atmosfären är det ökade upptaget av koldioxid till haven som ger en minskning av pH. Ett minskat pH i haven innebär att korallernas förmåga att bilda kalkskelett försämras.
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| 47. |
- Ekelund, Nils, et al.
(författare)
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Årstidsvariationer i sjöar vid klimatförändringar / Seasonal Variations in Lakes in Northern Sweden in a Changing Climate
- 2019
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 74:4, s. 181-188
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Ekosystem bestående av sjöar och vattenområden är viktiga och känsliga indikatorer på klimatförändringar eftersom de svarar relativt snabbt på förändringar i klimatet. Många sjöar på norra halvklotet täcks av is under vintern och de är dimiktiska, vilket innebär att vattnet cirkulerar två gånger varje år. Isen förhindrar inte bara gasutbyte eller vindblandning utan isen tillsammans med snö, är också ett stort hinder som förkortar odlingsperioden för alla producenter i sjön genom att minska ljusinsläppet. Vårblomningen av växtplankton tillsammans med den termiska skiktningen som sker under den lugnare sommarperioden kan förekomma tidigare på säsongen om isen bryts upp tidigare. Klimatuppvärmning kommer att leda till högre temperaturer och det kommer att förändra blandningsförhållandena såväl som den termiska skiktningen i sjöar. Samtliga sjöar som ingår i denna studie ligger i de södra delarna av Norrland i Sverige. Den genomsnittliga islossningen mellan 2001 – 2010 sker ungefär 12 dagar tidigare jämfört med den genomsnittliga islossningen mellan 1916 – 1925 och 11 dagar tidigare än för perioden 1976 – 1985. Den genomsnittliga årliga lufttemperaturen i Junsele uppvisar en trend där lufttemperaturen blir varmare med tiden. Högre lufttemperatur visar en god korrelation med förändringar i islossning, där sjöarna upplever en kortare tid med lager av is och snö.
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| 48. |
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| 49. |
- Fredriksson, Caroline, et al.
(författare)
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Historiska stormhändelser som underlag vid riskanalys : Studie av översvämningarna 1872 och 1904 längs Skånes syd- och ostkust
- 2017
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 73:3, s. 93-110
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- On November 13, 1872 an extreme flood occurred in the coastal areas surrounding the South Baltic Sea. An extreme storm surge in combination with high waves caused the death of about 300 people and more than 15,000 people lost their homes. Along the coast of Scania, southern Sweden, at least 23 people were killed and more than 100 houses were destroyed. Hundreds of fishermen lost their source of income when boats and fishing equipment were damaged by the waves and pulled offshore. During the night before New Year’s Eve in 1904 the Scania coast was again hit by a severe storm. This storm in 1904 was not as extreme as the storm in 1872. The damage was less extensive but of a different character, because railroads had been built along parts of the coast. This study presents information about the storms in 1872 and 1904 that is analysed with respect to the evolution of risk awareness, vulnerability, and societies’ resilience over time. After the storms, the coastal communities in Scania recovered quickly through governmental subsidies, voluntary work, and charity. If the 1872 storm would repeat itself today, the damage to buildings and infrastructure would be far worse and in some areas, human lives and health would be at risk. Meanwhile, the coastal communities of today are much richer, home insurances are more common, and fewer people depend on income from fishery. Studies of historical storm events that occurred before the start of systematic wave and water level measurements are important complements to risk analyses based on statistical extreme value models whose reliability is limited by the length of the data series. Increased risk awareness leads in itself to risk mitigation. Through understanding and remembering historical storm events and their consequences, individuals and the society can make informed decisions about the level of risk they are willing to accept to live near the coast.
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| 50. |
- Fredriksson, Caroline, et al.
(författare)
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Planering för ett förändrat klimat – strategi för att hantera stigande havsnivåer i fysisk planering i Ystad, Skåne
- 2014
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 70:4, s. 205-214
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Ystads kommun arbetar med en fördjupning av översiktsplanen för staden Ystad med omnejd. Ystads havsnära läge gör att klimatförändringen kommer att innebära stora utmaningar. Stigande havsnivåer väntas leda till ökade erosions- och översvämningsrisker i kustnära områden. Samtidigt är efterfrågan på havsnära boende stor och kommunen planerar att bygga ut staden mot havet. Författarna har utrett klimatförändringens effekter och föreslagit en strategi för hur kommunen ska bemöta klimatförändringen i sin fysiska planering. Strategin är proaktiv och innebär att staden i vissa delar skyddas genom ny exploatering framför den befintliga bebyggelsen. Sandstränder och naturområden skyddas genom åtgärder som ökar deras attraktivitet så att kommunen kan fortsätta att utveckla sin turistnäring. Strategin har som målsättning att klimatanpassningen ska utföras så att den tillför ett värde för Ystad och inte enbart ses som en kostnad. Skyddsåtgärder bör vara flexibla och anpassningsbara till förändrade prognoser och teknikutveckling. Eftersom osäkerheterna är så stora inför vad klimatförändringen kommer att innebära bör kommunen sträva efter att göra så lite som möjligt, så sent som möjligt, men ändå inte för sent.
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