屏東縣來社溪集水區土砂變遷之探討
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摘要
2009年莫拉克颱風在台灣南部带來超大豪雨,導致來義集水區多處大規模崩塌带來大量的土砂,沖毁了來義村沿溪堤防、道路及民宅;也造成下游地區河道產生淘刷及淤積的現象。近年來每逢豪雨,因河道大量土砂淤積使溪床壅高,危及下游聚落及居民。有鑑於此,本研究藉由基礎資料的蒐集與現地調查,掌握來社溪集水區土砂變遷之趨勢,並以數值地形分析崩塌範圍及土砂變化量,針對來社溪集水區土砂災害治理方案及可行性評估。
Typhoon Morakot brings extremely torrential rain.Large amounts of landslides occurred and destroyed the levees,roads and houses alongside the stream of watershed area Laishe Creek in 2009.Large amount of soil was deposited on the river bank,which caused the danger to the village and the transportation at the down-stream of Laishe Creek.Based on the observation data,the multi-period digital elevation models and the field-work records,this project provides the major trends of soil movement for the area occurring the severe soil-related disaster,which may serve as a reference for the conservation plans,detailed river training works or disaster prevention plans of Laishe Creek in future.
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