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- Pettersson, Thomas, 1966
(författare)
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FEM-Modelling of Open Stormwater Detention Ponds
- 1997
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Ingår i: Nordic Hydrology. ; 28:4/5, s. 339-350
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Tidskriftsartikel (refereegranskat)abstract
- Stormwater in urban areas is polluted with suspended materials which transport heavy metals and degrade the quality of the receiving waters. Since open detention ponds improve water quality, an investigation of a constructed pilot-scale detention pond was carried out.Measurements of inflow and outflow were performed and two flow-weighted samplers were used to collect representative samples of suspended solids and heavy metals. The particlesize distribution was analysed to allow an estimation of the settling of suspended solids. Particle removal from a rain event was defined as two different phases where the first phase occurs during the rain event and the second phase after the event. In this paper only the firstphase is considered. A FEM-software package (FIDAP) was used to calculate the three dimensional velocity flow field for one rain event. A sedimentation approach was applied to the flow field where paths were calculated through the detention pond for different particle sizes. The results from four different particle sizes show satisfactory agreement between FEM-calculated and observed particle removal. The results show that FIDAP is a useful tool to predict pollutant removal for open detention ponds with arbitrary geometry.
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| 2. |
- Pettersson, Thomas, 1966, et al.
(författare)
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Modelling of flow pattern and particle removal in an open stormwater detention pond
- 1998
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Ingår i: In: Proc. HydraStorm’98, Adelaide, Australia, 27-30 September 1998. ; , s. 63-68
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Konferensbidrag (refereegranskat)abstract
- In Sweden open stormwater detention ponds are more often used to reduce stormwater pollution through sedimentation. The pollution reduction occurs both during storm events and in between events. Design methods are often simplified and based on detention time only. However, not only the pond volume but also the geometry and thus the flow pattern are of concern when designing open detention ponds. In the city of Göteborg a 6200 m2 open stormwater detention pond was investigated with respect to massflows of pollutants and flow pattern. The observed data has been used to verify a FEM model established for the pond. Both 3-D and 2-D flow simulations have been performed at inflows starting at 20 l/s up to a maximum of 800 l/s. The simulations show that both 2-D and 3-D calculations give reasonable agreement with observed data. The 3-D calculations are however more accurate taking the bottom shape into account. Conclusions drawn from this study is that simulations of pond flow pattern are essential in designing pond geometry, and inlet and outlet locations.
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| 3. |
- Pettersson, Thomas, 1966, et al.
(författare)
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Modelling of open stormwater detention ponds
- 1996
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Ingår i: In: Proc. 7th International Conference on Urban Storm Drainage, Hanover, Germany, 9-13 September 1996. ; 1, s. 539-544
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Konferensbidrag (refereegranskat)
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| 4. |
- Pettersson, Thomas, 1966, et al.
(författare)
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Particle removal in detention ponds modelled for a year of successive rain events
- 1998
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Ingår i: In: Proc. Novatech 1998, 3rd international conference on innovative technologies in urban storm drainage, Lyon, France, 4-6 May 1998. ; 1, s. 567-574
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Konferensbidrag (refereegranskat)abstract
- The aim of this study was to model the removal of pollution in small open stormwater detention ponds by a simple method of particle settling. Simulations were made with a rain series for a normal hydrological year selected from a 19-year long rainfall series. TSS removal calculations were based on the US EPA-method. Measured TSS concentrations from the Järnbrott detention pond were used for comparison with the modelled concentrations. The model work showed that the removal efficiency is strongly dominated by inter-event settling. Removal efficiency may be improved by increasing the specific pond area up to 150 m2/ha. A consideration of the particle density has to be made since the removal efficiency is affected by low densities, often seen for urban runoff sediments.
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| 5. |
- Pettersson, Thomas, 1966, et al.
(författare)
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Pollutant removal efficiency in two stormwater ponds in Sweden
- 1999
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Ingår i: In: Proc. 8th International Conference on Urban Storm Drainage, Sydney, Australia, 30 August-3 September 1999. ; 2, s. 866-873
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Konferensbidrag (refereegranskat)abstract
- Open stormwater ponds have been frequently addressed as a method for treatment of stormwater since measurements show a considerable pollutant removal effect. Pollutant removal efficiency in two stormwater ponds in Sweden is studied where field measurements of inflow and outflow pollutant loads for several successive storm events are described. Cumulative effects of inflow and outflow pollutant discharges are studied and for the outflow a strong correlation to constant outflow pollutant discharges appears that indicate an independence of inflow pollutant load for the two ponds. Hereby, it becomes possible to extrapolate the annual loads from the ponds to the receiving waters of studied pollutants. The specific pond area (m2/ha) is 20 times larger in one of the ponds, which affect the pollutant removal efficiencies. A comparison between specific pond area and pollutant removal efficiency gave that the removal efficiency increases up to a certain level of surface/impervious area, 250 m2/ha, and above this level the increase is not as significant as below. Another factor that has an impact on the removal efficiency is the pond geometry.
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| 6. |
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| 7. |
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| 8. |
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| 9. |
- Pettersson, Thomas, 1966
(författare)
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Water quality improvement in a small stormwater detention pond
- 1998
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Ingår i: Water Science and Technology. ; 38:10, s. 115-122
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to investigate a small open detention pond predominantly receiving stormwaterdrainage from a highway. The results showed a difference in pollutant removal characteristics. Particle-associatedpollutants were effectively removed during storm events as indicated by EMC (Event Mean Concentrations) whiledissolved pollutants were not effectively removed. Outflow pollutant loads followed linear profiles when sevenconsecutive storm events were represented as cumulative graphs. PEMC's (Partial EMC's) during a storm eventshowed an association between the specific surface area of small particles and lead content. A detention pondshould be designed according to capacity to detain the complete storm volume, thus avoiding short-circuiting ofthe pond by pollutants.
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| 10. |
- Bergdahl, Lars, 1943
(författare)
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Ny kanal
- 1999
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Ingår i: Svensk Hamntidning. - 0346-2110.
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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