| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 101 === Empty flushing is the most effective approach to evacuate the deposited sediments in the reservoir. It requires complete drawdown of reservoir storage to allow the inflow passing through the reservoir at depths similar to riverine depths. However, emptying reservoir essentially conflicts with its water supply objective, thus a feasible strategy of empty flushing should prevent significant increase of water shortage risks. This paper presents a framework of performing empty flushing in tandem reservoir systems, where flushing is carried out in the upstream inline reservoir and the downstream off-line reservoir provides backup storage for stable water supply during and after flushing. A simulation model was developed to perform daily joint operation of reservoirs. During the simulation, if the storage of each reservoir achieves the predefined conditions, drawdown and empty flushing of the upstream reservoir is activated. During the flushing, if the storage of any reservoir, or the total storage reaches the predined thresholds, then the flushing operation is halted and the simulation switches back to the regular joint operation mode. Different activating and hlating conditions are tested to evaluate the most appropriate strategy which maximizes the volume of flushed sediments without inducing intolerable water shortage ris. The results from the case study of Tsengwen and Wushanto Reservoirs system validate the effeteciveness of the proposed approach.
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