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Article: Modelling the long-term suspended sedimentological effects on stormwater pond performance in an urban catchment

TitleModelling the long-term suspended sedimentological effects on stormwater pond performance in an urban catchment
Authors
KeywordsStormwater pond
Long-term performance
Urbanisation
Flood resilience
Sediment dynamics
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrol
Citation
Journal of Hydrology, 2019, v. 571, p. 805-818 How to Cite?
AbstractThe influence of long-term suspended sediment dynamics on stormwater pond performance should not be ignored, but is often neglected in pond design and performance evaluation. This paper provides systematic simulated quantification of long-term suspended sedimentological effects on stormwater pond performance. Integrated hydrological and two-dimensional hydro-morphodynamic modelling and simulations were carried over a 32-year period (1984–2015) covering 3896 rainfall events with a wide range of rainfall volumes, durations and intensities. Three event-based hypothetical rainfall scenarios: non-flood condition (5-year), sewer design condition (30-year), and river flood condition (100-year) rainfall events with 1-h duration, were also simulated for comparison between the traditional event-based approach and the novel approach presented in this study. Simulation results show that the flood peak attenuation and delay are more pronounced for small (<5-year) and medium (<30-year) flood events. The long-term continuous simulation results indicate that the pond provides positive annual trap efficiencies varying from 2% to 69% for 31 of 32 years, providing long-term water quality benefits downstream. However, an extreme rainfall event in year 2012 flush out the accumulated sedimentation as a shock load to the downstream river, leading to a negative trap efficiency of −11%. The spatially averaged sediment deposition rate, as predicted by the model, varies with a mean (SD) of 2 (1.34) cm/year over the study period, which resulted in a 24% loss in the pond’s volume over 32 years. The impact of the loss in storage on pond flood attenuation capacity are explored at regular time intervals over the study period. The results indicate that reduction in the pond’s flood attenuation capacity is relatively more pronounced for medium (30-year) and extreme (100-year) flood events than the frequent small flood (5-year) events. The variation in annual sediment loading with rainfall quantities and patterns are also explored.
Persistent Identifierhttp://hdl.handle.net/10722/272873
ISSN
2023 Impact Factor: 5.9
2023 SCImago Journal Rankings: 1.764
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorAhilan, S-
dc.contributor.authorGuan, M-
dc.contributor.authorWright, N-
dc.contributor.authorSleigh, A-
dc.contributor.authorAllen, D-
dc.contributor.authorArthur, S-
dc.contributor.authorHaynes, H-
dc.contributor.authorKrivtsov, V-
dc.date.accessioned2019-08-06T09:18:10Z-
dc.date.available2019-08-06T09:18:10Z-
dc.date.issued2019-
dc.identifier.citationJournal of Hydrology, 2019, v. 571, p. 805-818-
dc.identifier.issn0022-1694-
dc.identifier.urihttp://hdl.handle.net/10722/272873-
dc.description.abstractThe influence of long-term suspended sediment dynamics on stormwater pond performance should not be ignored, but is often neglected in pond design and performance evaluation. This paper provides systematic simulated quantification of long-term suspended sedimentological effects on stormwater pond performance. Integrated hydrological and two-dimensional hydro-morphodynamic modelling and simulations were carried over a 32-year period (1984–2015) covering 3896 rainfall events with a wide range of rainfall volumes, durations and intensities. Three event-based hypothetical rainfall scenarios: non-flood condition (5-year), sewer design condition (30-year), and river flood condition (100-year) rainfall events with 1-h duration, were also simulated for comparison between the traditional event-based approach and the novel approach presented in this study. Simulation results show that the flood peak attenuation and delay are more pronounced for small (<5-year) and medium (<30-year) flood events. The long-term continuous simulation results indicate that the pond provides positive annual trap efficiencies varying from 2% to 69% for 31 of 32 years, providing long-term water quality benefits downstream. However, an extreme rainfall event in year 2012 flush out the accumulated sedimentation as a shock load to the downstream river, leading to a negative trap efficiency of −11%. The spatially averaged sediment deposition rate, as predicted by the model, varies with a mean (SD) of 2 (1.34) cm/year over the study period, which resulted in a 24% loss in the pond’s volume over 32 years. The impact of the loss in storage on pond flood attenuation capacity are explored at regular time intervals over the study period. The results indicate that reduction in the pond’s flood attenuation capacity is relatively more pronounced for medium (30-year) and extreme (100-year) flood events than the frequent small flood (5-year) events. The variation in annual sediment loading with rainfall quantities and patterns are also explored.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrol-
dc.relation.ispartofJournal of Hydrology-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectStormwater pond-
dc.subjectLong-term performance-
dc.subjectUrbanisation-
dc.subjectFlood resilience-
dc.subjectSediment dynamics-
dc.titleModelling the long-term suspended sedimentological effects on stormwater pond performance in an urban catchment-
dc.typeArticle-
dc.identifier.emailGuan, M: mfguan@hku.hk-
dc.identifier.authorityGuan, M=rp02461-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1016/j.jhydrol.2019.02.002-
dc.identifier.scopuseid_2-s2.0-85062148377-
dc.identifier.hkuros300262-
dc.identifier.volume571-
dc.identifier.spage805-
dc.identifier.epage818-
dc.identifier.isiWOS:000462692100066-
dc.publisher.placeNetherlands-
dc.identifier.issnl0022-1694-

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