首都圏のヒートアイランド対策と東京湾浄化対策への深層海水利用検討案

概要

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Urbanization and population accumulation in Tokyo Metropolitan area, which has almost 30 million population, causing serious problems of heat island phenomenon and eutrophication in Tokyo bay. Possibility of deep ocean water is studied. Water of 200∼300m depth at the mouth of Tokyo bay may be suitable, as water temperature and nutrient concentration is relatively low there. Long pipeline of large diameter is necessary to transport ocean water. In the case study of 6 m diameter and 70km length pipe, 8% reduction of summer synthetic heat volume and 20% reduction of nutrient concentration in the inner part of Tokyo bay, may be expected. On the other hand, there are many problems of under sea tunnel construction technology, various impact to the environment, project revenue vs. huge construction cost etc..