| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系碩士在職專班 === 102 === This study is based on how Pa-Chang River has changed over the years. In order to understand the types of water scoures and siltations, this paper discusses about the influence on topographic change after the construction of porous basket. Hope it could be used for the reference of protecting river banks. First,the change of directon in Pa-Change river and the analysis on how the amount of river affects the flow direction will be disscussed by studying the information of topographic changes and river changes over the years. Second,this paper not only analyzes the flow change after project layout is carried out, but also explores tophgraphic change of river bed. Last, by doing a comprehensive analysis, we could know the relevance between groin revetment, roll gabion revetment, and gabion construction method.
According to the results, rainfalls,flow directions and the main channels variations bring huge influence to bank protection. After the construction of porous basket, the flow will be blocked and formed a deep channel around it. The flow which passed through the porous basket makes grains of sand in the deep channelformed a sediment behind the porous basket. Obviously, the source of the sand comes from the the sand of scouring effect, since the siltation and sedimentation match the direction of the flow.
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