Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Exceptional Backwater Effects on Wedge Storages and Flood Stages in a Large River-Type Reservoir: HEC-RAS Modeling of Feilaixia Gorge in the North River, South China. |
| Συγγραφείς: |
Zhong, Zhiwei, Wang, Xianwei, He, Yong, Cai, Silong, Tong, Hongfu |
| Πηγή: |
Water (20734441); May2025, Vol. 17 Issue 10, p1447, 21p |
| Θεματικοί όροι: |
Water storage, Backwater, Watersheds, Floods, Gorges |
| Περίληψη: |
Backwater effects of the Feilaixia Reservoir caused frequent inundations in the reservoir tail and complicated flood regulations in the North River basin. Currently, how backwater effects impact wedge storages and flood stages in the Feilaixia Reservoir remains unknown. This study established the 1D HEC-RAS model to simulate the water level profile and dynamic storage capacity in the Feilaixia Reservoir during two flood events and in 25 regulation scenarios. The results show that the simulated water levels aligned well with the measured data during the flood events in June 2022 and April 2024. The impact of backwater effects on flood stages, i.e., the water level difference between reservoir regulation and natural river, gradually diminished from the dam to the reservoir tail. The larger flood flow and higher water levels in front of the dam triggered greater wedge storages and higher flood stages and inundation risks in the reservoir. The narrow Mangzaixia Gorge produced a secondary backwater effect in the reservoir tail, resulting in distinct water level profile patterns above the Lianjiangkou confluence in the main stream and in the Lian River tributary. The backwater effects on wedge storage and flood stages were exceptionally large, and the ratios of wedge storages to static water storages in the Feilaixia Reservoir were 125% and 147% during both flood events, and even up to 199% as inflow reaches 20,000 m3/s, which should be carefully considered in operational flood regulation and levee height design in the reservoir. [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: |
Complementary Index |