| 1. |
- Ali, Ammar A., et al.
(författare)
-
Spatial total load rating curve for a large river : A Case study of the Tigris River at Baghdad
- 2020
-
Ingår i: International Journal of River Basin Management. - UK : Taylor & Francis. - 1571-5124 .- 1814-2060. ; 18:3, s. 363-376
-
Tidskriftsartikel (refereegranskat)abstract
- The Tigris River in Baghdad is a large sand-bed river, supply-limited because of the implementation of a water flow regulation scheme comprising a series of reservoirs and barrages. The significant reduction in the water discharge has affected the hydraulic performance of the river and turned it into an under-fit river of complicated morphology where many islands and bank deposits have been showed up across an 18km reach in addition to the essential sinuosity. Measuring sediment load at individual cross-sections in the river gives misleading estimates and the corresponding sediment rating curve has a locally limited using. A spatially sediment rating by investigating sediment loads over the complicated reach is required to overcome the local limitations. Sediment transport rates have been investigated at 16 cross-sections along the study reach by collecting suspended load, bed load and bed material samples. Velocity profiles were measured at the sampling stations using an Acoustic Doppler Current Profiler (ADCP). The measurement results indicated that the suspended load is the dominant mode of transport (93.5%). However, bedloads were considered in determining the total loads. A spatial total load rating curve in the form of a power function was established and examined against the sediment measurements. Twenty-two previously published total load formulae where applied at the same sections and of these the Colby1964 formula gave the closest fit to the measured loads. Based on the results from this study a recommended procedure is established for using a spatial total load rating curve to estimate sediment transport rates for similar morphologically complicated rivers. Average annual transport rates during the period 2009-13 was estimated at 3.21 million tons.
|
|
| 2. |
- Arvidsson, Björn, et al.
(författare)
-
A methodological approach for mapping and analysing cascading effects of flooding events
- 2023
-
Ingår i: International Journal of River Basin Management. - : Informa UK Limited. - 1814-2060 .- 1571-5124. ; 21:4, s. 659-671
-
Tidskriftsartikel (refereegranskat)abstract
- Current local or regional flood risk assessments, as required by the EU flood risk directive, rarely account for cascading effects due to interdependencies between critical infrastructures. However, it is essential to consider these effects, as they may severely impact areas outside the immediate flood risk area. The main purpose is to present and problematize a method (AB-CEM) for mapping and analysing cascading effects due to floods, aiming at also being relevant for other spatially widespread hazards. The method development and the pilot study, in Sweden, reveal that there is a prominent practical need for methods for mapping and analysing critical infrastructure interdependencies and cascading effects. Another key finding is that the method process and its results can serve as an important basis for decision-making about proactive and reactive efforts related to geographically extensive hazards. We further conclude that there is a recurring problem regarding sensitive and secret data. More specifically, the conflicting interests of information availability and information security concerning critical infrastructures, which needs to be resolved at the national level and communicated through clear guidelines. The method is a much-needed step towards accounting for cascading effects of floods in practice.
|
|
| 3. |
- Beven, Keith J., et al.
(författare)
-
Communicating uncertainty in flood inundation mapping : a case study
- 2015
-
Ingår i: International Journal of River Basin Management. - : Informa UK Limited. - 1571-5124 .- 1814-2060. ; 13:3, s. 285-295
-
Tidskriftsartikel (refereegranskat)abstract
- An important issue in taking account of uncertainty in flood inundation mapping is the communication of the meaning of the outputs from an uncertainty analysis. In part this is because uncertainty estimation in this domain is not a simple statistical problem in that it involves knowledge uncertainties as well as statistical (aleatory) uncertainties in most of the important sources of uncertainty (estimated upstream discharges, effective roughness coefficients, flood plain and channel geometries and infrastructure, choice of model, fragility of defences, etc.). Thus, assumptions are required associated with the knowledge or lack of knowledge about these different sources of uncertainty. A framework has been developed in the form of a sequence of condition trees to help define these assumptions. Since stakeholders in the process can potentially be involved in making and recording decisions about those assumptions the framework also serves as a means of communicating the assumptions. Recording the decisions also serves to provide an audit trail for later evaluation of the decisions and hence the resulting analysis. Communication can also be helped in this type of spatial problem by effective visualization techniques and a visualization tool has been developed for both a web-based service using Google Maps™ and a desktop application using the Matlab™ numerical package.
|
|
| 4. |
|
|
| 5. |
- Evers, Mariele, et al.
(författare)
-
Coherence and inconsistency of European instruments for integrated river basin management
- 2013
-
Ingår i: International Journal of River Basin Management. - : Taylor & Francis. - 1571-5124 .- 1814-2060. ; 11, s. 139-152
-
Tidskriftsartikel (refereegranskat)abstract
- Large rivers are particularly under pressure due to multiple uses which often have severe impacts on ecosystems, or water quality and flow. Conflicting aims and a lack of integration and cooperation in planning and management are not beneficial to sustainable management. Important elements of integrated river basin management (IRBM) include both water quality aspects and floodplain and flood risk management. On the other hand, land use and land use planning are also both of great importance for sustainable river management. However, water management and land use planning are generally treated as two distinct issues in planning procedures and decision-making processes. Even water quality and flood risk issues are often handled by different authorities. Integrated management of transnational river basins is even more complicated and difficult. In Europe, there is a range of relevant Directives such as the Water Framework Directive, Floods Directive and Habitat Directive. This paper illustrates how these legal and planning instruments influence the IRBM of large rivers. It analyses the potential synergies of the goals outlined in the directives and various related measures. Coherent but also inconsistent aspects of IRBM are identified against six different dimensions: political intention, legal, geographical, management, socio-economic and sustainability. The analysis shows potentials for synergies but also potential inconsistencies. We show that directives must be carefully coordinated to ensure coherent management and that synergies and site-specific goals, such as target areas, are important for sustainable management. Possible methodologies are described. IRBM can be considered as one possible approach towards sustainable development by coordinating different policies.
|
|
| 6. |
- Plummer, Ryan, et al.
(författare)
-
Improving river health : insights into initiating collaboration in a transboundary river basin
- 2016
-
Ingår i: International Journal of River Basin Management. - : Informa UK Limited. - 1571-5124 .- 1814-2060. ; 14:1, s. 119-132
-
Tidskriftsartikel (refereegranskat)abstract
- River health is a concern worldwide. Governance of river basins is particularly complicated when they are large scale and cross jurisdictional boundaries. Past approaches to making decisions in transboundary basins are limited and attention is increasingly being focused on the potential of collaboration. This research investigates the initiation phase of a collaborative conservation project (WWF-Canada Freshwater Program, St. John River project) in the St. John River Basin of Canada. A social-ecological inventory technique and social network analysis are used to identify the actors in the transboundary basin and their activities, perceptions and connections to river health, relationship with other stakeholders, and actual engagement with a milestone event in the project. Insights gained from exploring the relationships between/among these variables highlight the complicated nature of initiating collaboration. A common understanding of river health and a strong structure of connected actors were encouraging signs that collaboration may flourish, while the assertion of power and context surrounding the initiative were found to mediate its possibility. The collaborative potential of conservation projects in large-scale transboundary river basins may be enhanced through such research and by actively applying these insights.
|
|
| 7. |
- Popescu, Luigia, et al.
(författare)
-
Effects of climate change over energy production in La Plata Basin
- 2014
-
Ingår i: International Journal of River Basin Management. - : Informa UK Limited. - 1571-5124 .- 1814-2060. ; 12:4, s. 319-327
-
Tidskriftsartikel (refereegranskat)abstract
- The population growth and the economic development that the five Countries (Argentina, Bolivia, Brazil, Paraguay and Uruguay) located in La Plata Basin (LPB) have gone through over the last decades have risen the necessity to assess the current and future electricity demand and compare it to the energy production. In this region, the water resources of LPB are one of the most important sources of energy. In this context, the CLARIS EU (European Union) FP7 project has carried out an extensive research work which, in terms of investigating hydropower potential and vulnerability, has produced the following outcomes: assessment of current hydropower production and electricity demand; calculation of the maximum potential hydropower in order to establish whether and when shortage in terms of hydropower generation is to be expected; analysis of potential residual hydropower taking into account future user demands and analysis of hydropower production taking into account climate change scenarios, in order to identify potential vulnerabilities under variable input and/or needs for other sources of energy.This paper focuses on the outcomes of the climate change scenario analysis and its impacts on hydropower production in the basin. This has been investigated by (1) assessing the current hydropower production and electricity demand over the last 20 years (1991–2010), in order to establish growing trends in the short-term (2031–2040) and at the end of the century (2079–2098); (2) estimating maximum potential hydropower under present hydrological conditions; (3) analysis of potential vulnerability, by combining the first two research steps and (4) analysing the impact of climate change scenarios on hydrological variability and thus on hydropower production.The assessment of hydropower production and electricity demand determined that the current hydropower production represents about 73% of the electricity demand. Analysing the trends for the electricity produced by hydro-plants and the electricity demand, it is evident that the increment rate for the hydroelectricity production is lower than the increment rate of the electricity demand. Although, the maximum theoretically available energy at the basin level is about 683 GWh, the maximum feasible available energy (taking into account environmental flow requirements and financial constraints) will be of about 514 GWh per year.The climate change analysis shows an opposite trend at the sub-basin level, but overall, at the basin scale, the hydropower production is expected to increase because of changes in the hydrological variables.
|
|
| 8. |
|
|
| 9. |
|
|
