Prediction of the scale of anoxic water and possible measures for reducing it in eutrophic bays

2016 Fiscal Year Final Research Report

• Project/Area Number: 25289152
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Sasaki Jun 東京大学, 新領域創成科学研究科, 教授 (50292884)
• Co-Investigator(Kenkyū-buntansha): 鈴木 崇之 横浜国立大学, 都市イノベーション研究院, 准教授 (90397084)
• Research Collaborator: O Hechon ; A. A. W. R. R. M. K. Amunugama
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 水工学 / 海岸工学 / 貧酸素水塊 / 閉鎖性水域 / 環境再生 / 硫化物 / 有機汚濁 / 東京湾

Outline of Final Research Achievements

A pelagic-bed coupled numerical model for long-term prediction of bay environments was developed and applied to reproduction of 100-year time scale of processes in Tokyo Bay. Using the model, mechanism of formation of anoxic water and organic rich sediment was discussed. It has been pointed out that organic matter content has increased in spite of introduction of the total load control and one of the causes was considered as long-term accumulation mechanisms of organic rich sediment at the central part of the head of the bay, which did not mean overall extension of organic contamination. Numerical experiments on measures for environmental restoration of the bay indicate that their results are consistent with findings in terms of pelagic and bed processes revealed in field works, including the necessity of long-term implementation of restoration efforts for reducing the area of anoxia.

Free Research Field

環境水工学，海岸工学，沿岸環境学，国際開発学