本研究以台南市南化區羌黃坑集水區作為分析對象，此區域於2008年卡玫基颱風及2009年莫拉克颱風皆發生重大土石流災害，災後均進行土石流整治工程，包含野溪設置八座梳子壩、一系列潛壩工程及下游區域排水改善工程，以期整治工程能發揮攔蓄及調節土砂之功效，以降低衝擊下游區域的土砂量，達到減少土石流災害再次發生的可能性及降低土砂災害之規模。本研究使用FLO-2D及Debris 2D二維數值模式模擬分析莫拉克颱風之土石流流動特性，並比較分析兩套數值模式之差異性，結果顯示兩套數值模式模擬結果有相同的趨勢，但土石流推積深度及影響範圍略有不同。

In this study, the study area is the watershed of Qianghuangkeng in Nanhua, Tainan. The Qianghuangkeng watershed was destroyed by catastrophic debris flow in 2008 Typhoon Kalmaegi and Morakot 2009. After the debris flow disaster, disaster prevention facilities were built, such as comb dam, submerged dam and the construction of regional drainage for eliminating from the repeated debris flow disasters. This study presents the results of numerical simulations on the characteristics of debris flow. The two-dimensional numerical simulation model FLO-2D and Debris 2D are applied to the simulation of debris flow. The result shows the difference of flow depth and deposition area between FLO-2D model and Debris 2D model.