都市型洪水と宅造地

概要

論文の詳細を見る
Recently, many large cities and their vicinal areas frequently suffered from floods as a result of rapid urbanization. For example, in the dormitory towns of Tokyo, at the time of a heavy rain the overflows from the drain system are often observed. The sites of the dormitory towns can be divided into two groups, one has been constructed in the f1oors of the Holocene valleys and the other on the platforms veneered with the Pleistocene volcanic ash called the Kanto loam formation. The platforms in general are the recharge area in terms of groundwater. The home lots clowded on the platform reduce the percolation of rain-fall considerably. The more developmment of the home lots on platform, the less percolation of rain-fall into underground. For above reason, at the time of heavy rain, a great deal of rain-fall on the dormitory towns on the platforms flows down instantly toward the valley floors. The drain system in the valley floors is no longer to swallow all drains and results flood over the dormitory towns developed in the foot of the platforms.
日本地質学会の論文
1983-12-25