集水區治理主要在控制土砂安全無害通過集水區外及防止土石流 發生，因此要確實掌握土砂量體之來源及其分布，才能有效地解決集水區 的土砂災害。惟因土砂生產量體之估算未臻成熟，引發其防砂效益及治理 成效之疑慮。為此，本研究依據集水區地文條件、降雨條件、植生條件等 特徵之關聯性，建立「集水區土砂生產量估估模式」，並以LiDAR實測資 料為基礎，輔以多變量迴歸分析，歸納取得土砂生產量估算之簡易推估模 式，提供實務運用及規劃設計之參採。茲就本研究重要成果摘述如下：

The two key issues of watershed management are to conduct the sediment to get through the outer of the watershed safely and to prevent landslides from happening. So, in order to solve such sediment disasters in the watersheds, to note the origin and distribution of the sediment is significant for sure. However, the technique to estimate the amount of sediment volume hasn’t been mature yet, which would make the efficiency of sediment prevention and management to be doubtful. For this purpose, this study tries to establish “the estimation model of sediment yield in the watersheds” on the basis of the relevance of landscape features, rainfall factors, vegetation etc. in the watersheds and to build a simple estimation model of sediment yield, which is based on LiDAR data and multivariate logistic regression analysis. Furthermore, be the reference for field practice and project set. The main results of my study are as follows :