Study on Soil Erosion and Sustainability of Reservoirs

• Main Authors: Wu Chun Yi, 吳俊毅
• Other Authors: Chen Su Chin
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/05076792212627335619

碩士 === 國立中興大學 === 水土保持學系 === 89 === Constructing the sustainable indicators of the soil environment based on the soil erosion quantity under the calculation of SEIM(Soil Erosion Index Model) is an important step to know the sustainability of the reservoir watershed. The indicators of soil erosion sustainable model, which is presented, contains DSR (Driving force, State, Response) indicators frame. The relationship between soil erosion indicator AI and soil erosion sustainable development indicator SDI as follow: where AIl is the AI from the watershed is covered by tree completely ; AIu is the AI from inflow sediment for sustainable management in one thousand years ; AId is the AI from inflow sediment for design years. The relationship between soil erosion sustainable development indicator SDI and reservoir sustainable development indicator RSDI as follow: where SDIi is sustainable development indicator of the ith subsection of the reservoir watershed; ai is the percentage of area of the ith subsection; bi is soil erosion quantity SE of the ith subsection. This research also constructed sustainable development indicator estimating system of the Der-Ji reservoir watershed. It can analyze the change of the soil erosion quantity under the different land-use conditions and the sustainable development indicator as a reference for watershed development and plan. In the watershed of Der-Ji reservoir, RSDI is 0.366 now, but it will be raised to 0.687 and 0.600 after the simulation of long-term and short-term watershed management individually. The simulation provides ways for the reservoir watershed to reduce inflow sediment and extend lifespan of the reservoir.