2011-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/687362摘要：颱風與暴雨期間之崩塌地與土壤沖蝕量的估算，為水庫集水區泥沙與災害管理重要課題。石門水庫開始蓄水以來，水庫泥砂淤積問題嚴重，尤其在颱風暴雨期間，造成庫區大量的土砂堆積，如2004 年8 月艾利颱風導致當年水庫淤積2,891 萬立方公尺，使水庫的有效容庫降低，影響水庫永續經營。本計畫透過石門水庫集水區崩塌相關文獻蒐集與野外量測，建立崩塌地面積與體積經驗公式，將崩塌地依照其類型與子集水區的地文特性分類，探討個別差異對面積體積關係式的影響。另一方面，於颱風或暴雨事件後，採集秀巒子集水區邊坡的土壤樣本，分析土壤中的放射性核種鈹-7 的活性密度，推估土壤沖蝕量，並與沖蝕釘量測與通用公式估算結果比較，探討造成差異的原因，進而提出合理之土壤沖蝕量。而此計畫之成果將有助於集水區管理與災害應變，並對於泥沙的相關研究提出更深入之探討。<br> Abstract: Quantifying rate of landslide and soil erosion triggered by typhoon or storm event is a critical issue for sediment and hazard management of reservoir watershed. The silting of Shihmen reservoir has been a serious problem since reservoir started operating. Lots of sediments deposited in the reservoir, especially during typhoon and heavy rainfall events. For example, Aere typhoon triggered 2.8×107 m3 of sediment deposited in the reservoir. Then, silting of reservoir lowed down the capacity of reservoir and influenced sustainable development of Shihmen reservoir. This project will establish the scaling relationships linked landslide volume to area by the data from field measurement and collecting publications, and will investigate the Volume-Area scaling linked with their landslide type and location. In the other hand, this project will collect soil samples on the hillslopes located at the Hsiuluan sub-catchment after typhoon or storm events to analyse the activity density of beryllium-7 of soil to estimate erosion rate. Furthermore, we will investigate the difference of soil erosion rates estimated by beryllium-7, erosion pins, and USLE to propose a reasonable soil erosion rate. The results of this project will help make better watershed and disaster management and have advanced studies about sediment research.放射性核種鈹-7土壤沖蝕量通用公式石門水庫集水區Beryllium-7Soil erosionUSLEShihmen Reservoir watershed