| Summary: | 碩士 === 國立交通大學 === 土木工程學系 === 101 === Shimen Reservoir with the function of water supply contributes to the north of Taiwan enormously. Nowadays, the problem of sediment deposition in Shimen Reservoir is more and more seriously. It becomes more important to deal with the deposition efficiently. Recently, there have been many research about sediment bypassing in Shimen Reservoir. There are three alternative cases about sediment bypassing, which are C1 case(with extension tube in Dawanping), D2 modified case(in Amouping) and C1(with extension tube)+D2 modified case. The functions of these cases which are drainage and desilting on C1 case, only drainage on D2 case, and joint operation of C1and D2 case. This study simulates sedimentation of Shimen Reservoir before and after with sediment bypassing operation with one-dimensional mobile mode tool in order to comprehend that the erosion and deposition of bed changes and the desilting efficiency of outlets.
From the simulation results in this study, we can know that the erosion and deposition in the reservoir occur downstream of the bypassing tunnel. The more water discharge from sediment bypassing tunnel, the less desilting efficiency of outlets will be improve. After considering the three cases, the reductions of sediment release efficiency of existing outlets are 12.54%, 6.26%, and 11.61%, respectively. The improvement of C1case (with extension tube) is most obvious, followed by C1(with extension tube)+D2 modified case and D2 modified case.
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