降雨所造成之邊坡破壞的發生機制相當複雜，若能了解其發生機制，進而提出因應對策，即可對眾多潛在土砂災害區域進行有效治理。斜坡地下水之滲出點常為坡地滲流破壞起點，故本研究利用Hele Shaw Model模擬斜坡飽和含水土層的地下水位變化情形。本研究以實驗探討不同上游地下水位及坡度下之自由水面剖面，其流量變化及濕鋒前進、後退歷程。經由實驗觀察並紀錄自由水面高度、流量、時間及相關物理量等，針對水頭高以及坡度因子對自由水面之影響作探討，最後並與理論式進行比較。 The mechanism of seepage-induced slope failures is quite complicated, and the initiation of those failures usually occurs at the seepage face. In this study, we examine the saturated groundwater seepage profile by employing the Hele Shaw Model. Under different slopes and upstream groundwater depths while pertaining zero downstream water depth , the seepage profile and the corresponding discharge are evaluated. The advancing fronts and the retreating fronts under different transient flows are also analyzed. The experimental data are used to evaluate the validity of Dupuit Model and the improvement of Boussinesq equation for hillslopes.
