芦田川河口湖水域における水質挙動の調査・解析

概要

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The objective basin of this research is a lower course of the Ashida river passing through Fukuyama-city. As the urbanization of this area in recent years, the extent of pollution of river water grows remarkably worse. Especially, after the construction ofbarrage at the river-mouth in 1981, we have two serious problems for management ofwater quality. The one is a preservation of reservoir water which has been caused to eutrophicate and the other is a purification of the inflow water from small branch rivers which has been polluted heavily in exceed of the envilonmental standard. As a part of analysis for above-mentioned sabjects, this research was carried out by field survey of this area during about two years since summer in 1995. The analytical results by using several items such as pH, DO, COD, SS, T-N, and T-P, are discussed with relation to the time-dependent characteristics of both precipitation and river-discharge.