石門水庫集水區土壤厚度經驗式探討

Discussions on Empirical Equations for Soil Depth in Shih-Men Watershed

林伯勳(B. S. Lin) ； 許振崑(C. K. Hsu) ； 陳建宏(S. Y. Chiou) ； 冀樹勇(S. Y Chi) ； 邱世宜(S. Y. Chiou) ； 鍾啓榮(C. R. Chung) ； 王晉倫(C. L. Wang)

《水保技術》 6卷2期 (2011/04) Pp. 98-109

https://doi.org/10.30040/JSWCT.201104.0004

摘要

近年高強度及長延時暴雨颱風事件頻仍，易引致大規模坡地崩塌發生並伴隨地表逕流落入河道，構成集水區土砂供應料源；其崩塌量多寡除受制於崩塌規模大小，亦與對應土壤厚度有關。土壤厚度不僅與坡度有直接關係，且深受地形曲率影響。本文蒐集石門水庫集水區主支流土壤厚度資訊，依地域特性建立具合理化且可信高之土壤厚度經驗式，冀能有效推估災害事件後引致新增崩塌量，供以相關單位進行集水區全流域土砂防治策略擬訂及整治規劃。

關鍵字

土壤厚度 ； 崩塌量 ； 防砂策略

並列摘要

Long duration, high intensity rainfall associated with typhoon storm events causes landsliding and surface runoff. Surface runoff in turn leads to erosion. Debris sediment from landsliding and surface erosion contribute to river sediment yield. The size of the landslide and depth of the soil that the landslide takes place in effect the total landslide volume. Soil depth has been found to not only be related to depth but also the terrain curvature. In this study, soil depths have been measured from the trunk stream and tributaries of the Shih-Men watershed to establish a rational and reliable empirical equation for soil depth relative to topological characteristics. The hope of this study is that the empirical formula can be used to guide estimates of landslide volume for a given disaster event. The availability of such an empirical equation would help mitigation strategies and project management in response to sediment disasters that affect an entire watershed.

並列關鍵字

Soil Depth ； Landslide Volume ； Mitigation Strategy on Sediment Disaster