土石流之衝擊力與防治工法介紹

The Impact Force and Countermeasure Structures of Debris Flow

林炳森(Ping-Sien Lin) ； 林基源(Ji-Yuan Lin)

《地工技術》 74期 (1999/08) Pp. 67-80

https://doi.org/10.30140/SG.199908.0006

摘要

土石流的破壞力來自其大量的土砂與快速運動衝力，其衝擊力包含土石流流體動壓力與巨礫的撞擊力兩部份。土石流防治工法乃針對如何減少土砂量與降低土石流運動衝力而考量，上游發生區以抑制土石材料來源與避免土石發生流動為目的，中游流動區除避免土石流材料加入外並以攔阻及減緩土石流流速，使土水分離為目的，下游堆積區則以防止土石堆積造成災害為目的。本省以往土石流防治工法中之攔阻工法以非透過性防砂壩為主，近來有逐漸考慮採用透過性防砂壩之趨勢。

關鍵字

土石流 ； 衝擊力 ； 防治工法

並列摘要

The destruction of debris flow comes from its containing a lot of granular soilds and also its quick movement. Fluid pressure and impact of large boulders are two factors contributing to the impact force in its quick movement. The countermeasure structures of debris flow are built to reduce the amount of debris and slow down the velocity of its movement. On the upper section of the stream, the structures are to reduce the amount of debris and avoid transformation of debris flow. On the middle stream, the structures are to retain and slow down the debris flow. On the lower part of the stream, the structures serve as a way of eliminating damages from accumulation. In Taiwan, the closed-type of sabo dams are mainly used as the retaining method of countermeasures. However, the open-type of the permeable dams have been gradually increasingly adopted in recent years.

並列關鍵字

Debris Flow ； Impact Force ； Countermeasure Structures