期刊
ENVIRONMENTAL ENGINEERING SCIENCE
卷 38, 期 12, 页码 1195-1205出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/ees.2021.0003
关键词
catastrophic flood; flood control capacity; flood control scheduling; Jingjiang flood diversion area; Three Gorges Reservoir
资金
- National Natural Science Foundation of China [51979105, 52025092]
An accurate assessment of flood control capacity of a reservoir is essential for ensuring the safety of flood control works. This study used a one-dimensional hydrodynamic model to evaluate the flood control capacity of the Three Gorges Reservoir and found that while it can effectively withstand most large floods, additional measures are needed for exceptionally rare flood events. It is suggested to utilize a series of upstream cascade reservoirs for a joint flood control strategy in such extreme cases.
An accurate assessment of flood control capacity of a reservoir is a prerequisite for ensuring the safety of flood control works. This study used the method of adding side reservoirs and used MIKE11 to establish a one-dimensional hydrodynamic model of the Three Gorges Reservoir (TGR). Based on the combination of the dynamic reservoir capacity flood control and the separation of the outflow of the Jingjiang Three Outlets, the flood control capacity of the TGR was assessed. The results showed that the TGR can effectively withstand large floods below the magnitude of 100-year return period discharge. For a rare flood event in 1,000 years recurrence interval, it is necessary to use the Jingjiang flood diversion area for ensuring the safety of downstream floodplains along the main river course. As far as exceptionally large floods with the return frequency of 0.01% or lager magnitude concerned, this extreme high flow cannot be safely impounded by the TGR even if the Jingjiang flood diversion area is adopted. Therefore, a series of upstream cascade reservoirs are suggested to be fully utilized for a joint flood control strategy.
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