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防砂壩與下游河床特性對土石流流動影響之研究

Study on the Effects of Dam and Downstream Bed's Characteristics on the Flowing of Debris-flow

摘要


土石流災害在本省發生之頻率,近年來有逐漸增加,且災情也有愈來愈嚴重之趨勢,而台灣河川上游之防砂設施大都為封閉之重力式防砂壩,當土石流溢流過壩頂之後,運動方向急遽地改變、土砂礫之間的碰撞、防砂壩高度及其所造成之跌水效果、下游河床糙度之摩擦阻力等,都能減低土石流之運動趨勢或促使其臨時停止。本文係利用室內渠槽試驗,探討防砂壩下游河床對土石流停止並堆積的影響。

關鍵字

土石流 防砂壩

並列摘要


With gravity-type, sabo dams in Taiwan were filled and overflow for their insufficient space when the debis-flow occurred. The dam's height, bed roughness and slope of the dam's downstream might affect the flowing and deposit character of the debris-flow. The purpose of this paper is to study the relationship' between, the dependents (length, thickness, and stable slope of deposit) and variables (dam height, stream roughness, and bed slope).

並列關鍵字

Debris-flow Saba dam

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