Nutrient and Cod Loads in the Edo, Ara, Tama and Naka Rivers Under Flood Flow Conditions

Abstract

and Satoshi OOTSUKA 1 学生員 学(工) 東京理科大学大学院 理工学研究科土木工学専攻修士課程 (〒278-8510 千葉県野田市山崎2641) 2 正会員 博(工) 東京理科大学准教授 理工学部土木工学科(同上) 3 非会員 学(工) 埼玉県(元東京理科大学学部生) 4 非会員 学(工) 東京都文京区(元東京理科大学学部生) 5 非会員 東京理科大学 理工学部土木工学科 Previous evaluation of pollutant loads for the basin of Tokyo Bay are not accurately treated with the influence of flood-flow conditions. In the present study, we attempt to clarify the nutrients and COD loads in the main influent rivers under hydrologic events. For this purpose, we mounted automatic water samplers at the Edo, Ara, Tama and Naka Rivers. The observed results indicate that specific relations between river discharge Q and water quality are found in each river. The pollutant loads in the Ara and Naka Rivers are dominant in flood and low flow conditions, respectively. The large amount of the nutrients and COD loads were transported under flood flow conditions in all rivers.