Abstract
The occurrence of debris flow is strong affected by ground water flow. Heavy rain raises the degree of saturation in the riverbed deposits in steep watersheds. Ground water flow follows various parts and flows out from the soil. Therefore, the degree of saturation of a soil is not constant. But, in most studies, the riverbed deposit which is the source of debris flow is considered to be saturated. In our research, we observe the variation of water content in the riverbed deposit and rainfall in a mountainous watershed in order to evaluate the influence of unsaturated ground water flow on debris flow formation. The measurements show that most of the deposit was unsaturated when sediment movement occurred. They showed that sediment movement typically occurred during event for which the effective rainfall, computed with a half-life of 1.5 hours, exceeded 15mm.
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Schedule a callMore From: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
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