土石流防治工程之規劃設計

Planning and Design of Debris-Flow Prevention Countermeasures

謝金德(Chin-Teh Hsieh)

《地工技術》 94期 (2002/12) Pp. 29-40

https://doi.org/10.30140/SG.200212.0003

摘要

台灣地區土石流危險溪流依據行政院農業委員會水土保持局於民國91年完成之調查，共有1420條之多。民國88年921地震後，中部重建區土石流發生之頻率更高，其規模亦更大，土石流防治工程實為災害防救重要的一環。由於土石流之特性與一般山洪截然不同，其防治工程之規劃設計與一般治山防災工程有顯然之差別。本文就土石流發生之原因與條件，土石流防治整體規劃原則，各種防治工法如非透過性防砂埧、透過性防砂埧及沈砂池等之設計予以介紹。此外對於過去在土石流危險溪流施設之整治工程受損之原因亦加以分析檢討，以利工程師規劃設計之參考，期能避免類似工程災害之重演。

關鍵字

土石流 ； 透過性防砂壩

並列摘要

According to the investigations performed by Soil and Water Conservation Bureau, Council of Agriculture, Executive Yuan in 2002, there totally 1,420 streams were categorized as potentially hazardous stream of debris-flow. The frequency of debris-flow occurrence increases with large-scale in the restoration area of central part of Taiwan after chichi earthquake in 1999. Consequently, debris-flow hazards and the associated prevention countermeasures have now become a major concern in disastrous remedies. However, due to the distinct characteristics of debris-flow, which is significantly different from the mountain flooding, the planning and design of prevention works against debris-flow need to be carried out with great care.This paper presents the design of prevention countermeasures such as consolidation-type sabo dam, open-type sabo dam and debris retention basin on the basis of the factors and conditions controlling the occurrence of debris-flow and the principles of overall planning of debris-flow prevention. In addition, the main causes of the damage of structures and facilities used to prevent debris-flow hazards in the past were also analyzed and discussed. It is of great advantage to the engineers to take the case histories and lessons depicted as a reference in their planning and design works without encountering difficulties.

並列關鍵字

debris flow ； open-type sabo dam