余笹川流域の1998年水害の発生構造について
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概要
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Severe flood disaster occurred in the Yosasa River basin due to heavy rainfall on August 27, 1998. The discharge of flood flow was about four times as large as the average conveyable capacity of the river channel in the investigated reach. In this paper, the cause of new channels formed by the flood flow was discussed on the basis of the field survey and aerial photographs taken before and after the flood around the Yosasa River. It was cleared that the new channels were formed in the place where curved river channels were extremely narrow and this kind of disaster is related to land use around curved river channels. The author arrived at the conclusion that the cause of disaster is in the following points; (1) the record rainfall and discharge of flood flow, (2) the characteristics of flood plains in valley and river channels, (3) land use around river channels, and (4) poor maintenance of the river.
- 2005-11-30