臨海部における地盤環境問題 (災害とその予測--第4紀研究の果たす役割<特集>)

概要

論文の詳細を見る
A waterfont zone, located at the boundary between the sea and the land, is likely to incur serious damage by natural disasters.Representative bay areas in Japan, such as Tokyo, Ise, Osaka, and Ariake, have vast alluvial plains lying behind them. These areas are typical weak ground zones. To add to the danger, there are always large urban area and vast reclaimed land just on the weak ground.The weak ground along the Tokyo Bay area consists of the Holocene Yurakucho Formation and the uppermost Pleistocene Nanagouchi Formation. The sediment composing both formations is called “Chuseki-so”deposits by geotechnical engineers and applied geological engineers in Japan.The geotechnical evaluation of the ground is affected by the complex buried topography beneath the“Chuski-so”deposit. Generally speaking, the thinner the“Chuseki-so”deposit is, the better the ground condition is from geotechnical point of view.Reclaimed land is made by using dredged and pumped up sandy soil near sea bottom. Reclaimed layers are very loose because of their extremely short diagenetic geological age. And land reclamation often worsen the water environment in the bay.Consequently, it is clear that waterfront zones are vulnerable to earthquakes, typhoons, heavy rains, land subsidence, etc. In reclaimed land, the potential for damage by liquefaction during earthquakes has become a major concern in recent years. Typhoons bring damage from tidal waves and storms.Countermeasures against earthquakes and typhoons are indispensable in the waterfront zone. In addition, artificial beaches such as those created by retaining walls with gentle slopes and shallow sea shores are necessary to remediate water polluted by reclamation.
日本第四紀学会の論文

臨海部における地盤環境問題 (災害とその予測--第4紀研究の果たす役割<特集>)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク