土石流發生機制與地質環境之相關性

The Relationship on the Geological Environment and Triggered Mechanism of Debris Flow

陳宏宇(Hong-Ey Chen) ； 蘇定義(Ding-I Su) ； 陳琨銘(Kun-Ming Chen)

《地工技術》 74期 (1999/08) Pp. 5-20

https://doi.org/10.30140/SG.199908.0001

摘要

本文從花蓮銅門村及南投信義鄉之兩個案例的航空照片判釋、地貌表徵、地質概況、地質材料特性以及穩定性分析等一系列的調查資料來瞭解土石流的發生機制。調查結果發現，在溝谷堆積之地質材料雖然不多，但在高降雨強度之下，上游溝谷兩側谷壁會產生崩塌，崩塌之土、石與水以及溝谷中已堆積之地質材料混合成土石流，一面順坡往下流動，一面持續淘挖、侵蝕中游谷壁兩側之坡體，並匯聚這些崩塌之土石方量繼續往下游流動而產生災害衝擊。

關鍵字

地貌表徵 ； 地質材料 ； 機制 ； 土石流

並列摘要

Various investigated methods of aerial photographs, geomor-phological characteristics, geological condition, geomaterial properties and stability analysis were used to identify these hazardous mechanism by two debris flow cases in Tungmen, Hualien and Shing-Yi, Nantou. The investigation results demonstrated that these deposited materials were triggered and moved downward to the lower part of the gully by high intensity precipitation. These geomaterials coverged from the sidewall of the gully by cutting and erosion from the moving debris flow.

並列關鍵字

geomorphological characteristics ； geomaterial ； mechanism ； debris flow