Prediction Of Landslide-induced
Debris Flow Hydrograph:
The Atsumari Debris Flow Disaster In Japan
Author(s)
H. Takaoka, H. Hashimoto, S. Ikematsu & M. Hikida
Abstract
Landslides sometimes occur on mountain slopes by heavy rains. Some of them
change into debris flows and then move into mountain rivers. The debris flows
erode the river bed and increase their discharge. Prediction of debris flow
discharge becomes important for the simulation of flooding debris flows along
the river. The purpose of the present study is to develop a prediction model of
the landslide-induced debris flow hydrograph. This study is composed of three
steps. First, we assume a transformation model of landslide into debris flow.
Second, we calculate the development process of debris flow in the middle reach
and determine the debris flow discharge. Finally, we simulate the flooding
process of debris flow in the downstream reach.
Keywords: Atsumari River, debris flow, landslide, bed variation.
1 Introduction
There was a continuous heavy rain in Minamata City, Kumamoto Prefecture,
Japan on July 20, 2003 (fig. 1). Especially, at the Atsumari River basin in the
Minamata City as shown in fig. 2, the maximum hourly and accumulated rainfall
was 91 mm/h and 323 mm, respectively (fig. 3). As a result, a large-scale of
landslide occurred on the right-hand side slope of the Atsumari River. The
landslide changed into debris flow. During the movement in the middle reach at
steep slope, the debris flow eroded the river bed and bank and increased its flow
discharge. In the downstream reach at mild slopes, the debris flow caused
sediment deposition and moved over river bank. The debris flow broke several
Keywords
Atsumari River, debris flow, landslide, bed variation.
Related Book
Other papers in this volume
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