Effects of sediment deposit on the hydraulic performance of the urban stormwater drainage system
| Autor: | C N X Quang, N N H Giang, H V Hoa, P Q Hung |
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| Rok vydání: | 2022 |
| Zdroj: | IOP Conference Series: Earth and Environmental Science. 964:012020 |
| ISSN: | 1755-1315 1755-1307 |
| DOI: | 10.1088/1755-1315/964/1/012020 |
| Popis: | Sediment deposit is a critical factor strongly affecting the drainage capacity of the conduits due to its cross-section area narrowing and roughness increasing. In this study, a numerical model was applied to investigate the influences of sediment deposit on the hydraulic performance of the drainage conduits. The Nhieu Loc - Thi Nghe (NL-TN) basin, located in Ho Chi Minh City, Vietnam, was selected as a case study. The drainage network of the NL-TN basin was simulated by using the EPA-SWMM model. The effects of sediment deposit were assessed by a non-dimensional comparison of the simulated peak flows of the sediment-deposited conduits and the clean ones. The results indicated that the sediment deposit significantly affects the flow capacity of the conduits and could cause severe inundation. Narrowing of the cross-section area has more impact on the hydraulic performance of the conduit than the increase in the roughness. A 40% increase in the Manning coefficient could decline the peak flow to approximately 80-90%, while a 40% increase in sediment thickness depth could degrade the peak flow by about 60-70% to compare with the peak flow of the clean conduit. The findings could support decision makings on the operation and maintenance of the sewer system and adaptation to extreme rainfall events. |
| Databáze: | OpenAIRE |
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