| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 102 === Reservoirs not only built to retain water also for distribution during dry seasons. One of the most important influence the design life of reservoirs is the annual sediment input to reservoirs. The study area located in Shihmen reservoir, Taiwan. It is a important reservoir for distributing water in central Taiwan. To understand the amount of soil erosion of watershed, firstly we use Arc GIS graphic model to build USLE as the analysis tools, secondly we use one of the most important formula called Universal Soil Loss Equation, USLE as the caculating formula. There are six factors of USLE, namely the rainfall factor Rm, the soil erodibility factor Km, the topographic factors including the slope length factor L and slope degree factor S, the crop management factor C, and the erosion control practice factor P. Because of Arc GIS graphic model has its convenient, so we can analyze different years of sources to get the amount of soil loss of each year.
Instead of using USLE formula, we also combine with GIS tools. Use GIS tools to build model, analyzing each factor of USLE. The result can be seen as judge the life of the reservoir.
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