2010 Fiscal Year Final Research Report

Fundamental Study on Prediction and Control for Eutrophication and Hypoxia in a Closed Water

Research Project

Project/Area Number	21880036
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Single-year Grants
Research Field	Irrigation, drainage and rural engineering/Rural planning
Research Institution	Kyushu University
Principal Investigator	OZAKI Akinori Kyushu University, 大学院・農学研究院, 特任助教 (40535944)
Project Period (FY)	2009 – 2010
Keywords	閉鎖性水域 / 水質成層 / 密度流 / 曝気装置
Research Abstract	In this study, it was our aim to identify several original conditions of density stratification which was closely related to eutrophication and hypoxia in a closed water environment and to look at effect of aerator and wind-induced flow on density stratification as elimination method for density stratification. We focused on density flow and water quality transport of closed water in the hot and rainy season and conducted field observations and hydraulic experiments. From the results, it was confirmed that wind-induced flow which was stimulated by strong wind had stratification eliminating potential similar to a running aerator. In addition, it was clarified that supply and transport of turbulent energy induced by wind was important for elimination of density stratification.