本研究根據流域水、砂生產及運動過程，建立水、砂生產及運動模式，用以模擬集水區內由降雨所衍生之水、砂運動過程，包含地表漫地流與表土沖蝕、地下水流及淺層崩塌等水、砂生產過程與河道渠流、非均質輸砂以及動床演算等水、砂運動過程，除模式之開發外，更針對模式實用性，建立參數設定與率定、驗證流程，大幅降低模式使用門檻；本研究所提出之模式為一結合坡面與水系之準二維格網系統，不但降低傳統二維模式在計算時間與網格配置受限之缺點，更在坡面系統上建立真實空間網格，使模式對於山區土砂生產過程能有更高精度之模擬。
完成之模式除了基本之守恆性、穩定性，亦針對使用參數進行敏感度分析，以增加模式使用之便利性，而最後本研究針對大安溪流域內烏石坑集水區於2005年至今之水、砂運動過程進行模擬，模擬成果良好，顯示本研究所發展之模式相當適合於山區河川之水、砂生產及運動過程。

In Taiwan, the catastrophic typhoon is an important factor to trigger serious landslides in mountains. For example, Typhoon Morakot in 2009 caused 39,492 hectares for landslide areas. The sediments yield from landslides triggered the mass movement in the mountains and caused serious hazards. In order to make the manage plan for watersheds, an applicable numerical model is needed to estimate the mass movement. In this study, the purpose of this research is to establish a model for sediment yield and transportation in a watershed. The model can be simulating the process of sediment yield and transportation in a watershed during rainfall. The processes of sediment yield and transportation, which including several major mechanisms, runoff, soil erosion, groundwater, shallow landslide, channel flow, bed load, suspended load ,river bed and sediment size variation are established in this model. The scheme of the model is setup as quasi-two dimension model and based on mass conservation. This scheme can shorten lots time in simulation, and shows more detail terrain characteristic in special scale, resulting in sediment yield and transportation can be accurately assessed.
The conservation, stability, and sensitivity analysis of this model are also preceded in this research. The result shows that conservation of runoffs and sediment is accurate, and the simulation is very stable in common cases. Furthermore, the results of sensitivity analysis presents that infiltration velocity, hydraulic conductivity and slope gradient of the hill are the most significant parameters. Finally, the Wushihkeng watershed in Central Taiwan is selected to simulate the process of sediment yield and transportation during 2005 to 2011 by this model. The simulation shows this model could provide good result at sediment movement in watershed. So the model is effective in watershed management.

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