Risk Assessment Method Of Debris Flow
Occurrence Utilizing A Digital Terrain Model
Author(s)
O. Nunokawa, T. Sugiyama, N. Ota, K. Okada & T. Fujii
Abstract
In Japan, train operation control based on rainfall index is being applied when it
rains to secure the safety of the train. It is necessary to evaluate the stability of
the slope considering the change of the water level on the slope’s surface layer
for executing operation control more appropriately during wet weather. We have
investigated an analytical model to make the evaluation method for the debris
flow occurrence risk.
The velocity of the water, which runs on the surface of the ground changes in
various ways according to the ground’s inequalities, whereas, using this method,
the velocity of the flow on the surface of a mesh is expediently constant. The
velocity of the surface flow was assumed to be constant, and we examined the
influence that the velocity exerted on the safety factor and the runoff. When the
velocity of the surface flow is 2m/min, the peak of the rainfall is corresponding
to the peak of the amount of flow. Such a tendency obtained as a result of
calculation gave good agreement with the report of some past debris flows.
Therefore, it is concluded that this method is appropriate for the evaluation of the
risk of the debris flow occurrence.
Keywords: digital terrain model, surface flow, rainfall.
1 Introduction
In Japan, railway operation is controlled according to rainfall in order to ensure
railway safety from rain-induced slope failures. Rainfall levels at which to start
operational control have been determined empirically on the basis of factors such
as disaster prevention measures, information on past disasters, and rainfalls that
Keywords
digital terrain model, surface flow, rainfall.
Related Book
Other papers in this volume
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