筒狀模式之土壤雨量指數應用於土石流防災警戒

Soil Water Index Applied as a Debris Flow Warning-Reference Based on a Tank Model

陳樹群(Su-Chin Chen) ； 蔡喬文(Chiao-Wen Tsai) ； 陳振宇(Chen-Yu Chen) ； 陳美珍(Mei-Chen Chen)

《中華水土保持學報》 44卷2期 (2013/06) Pp. 131-143

https://doi.org/10.29417/JCSWC.201306_44(2).0004

摘要

A tank model is a conceptual model which simulates the moving behavior of water in the soil layers, including runoff, infiltration and percolation. The water depths of three tanks, representing surface, middle and deeper soil layers, respectively, were summed up as a soil water index (SWI). This study analyzes the debris flow cases in Eastern Taiwan based on the tank model and the current warning threshold value for debris flow. Results showed SWI has a linear relationship with the depth in the second tank, i.e. the soil moisture in the middle soil layer is closely related to the occurrence of debris flow cases. In addition, debris flow occurred when SWI＞107mm. This finding can be used as a warning for debris flow in Eastern Taiwan.

關鍵字

筒狀模式 ； 土壤雨量指數 ； 土石流災害 ； 警戒基準值

並列摘要

A tank model is a conceptual model which simulates the moving behavior of water in the soil layers, including runoff, infiltration and percolation. The water depths of three tanks, representing surface, middle and deeper soil layers, respectively, were summed up as a soil water index (SWI). This study analyzes the debris flow cases in Eastern Taiwan based on the tank model and the current warning threshold value for debris flow. Results showed SWI has a linear relationship with the depth in the second tank, i.e. the soil moisture in the middle soil layer is closely related to the occurrence of debris flow cases. In addition, debris flow occurred when SWI＞107mm. This finding can be used as a warning for debris flow in Eastern Taiwan.

並列關鍵字

Tank model ； soil water index ； debris flow disaster ； warning threshold value