WATER QUALITY CHANGE IN EUTROPHIC LAKES DUE TO DIVERSION AND WATER SUPPLY FROM NEARBY RIVERS, CASE FOR INBA MARSH

Abstract

Water quality conservation for eutrophic lakes has many perspectives in terms of factors by which phytoplankton growth is affected. Change of water control such as diversion and water supply from nearby rivers seems to provide instantaneous effect on water quality of the lakes. However, these changes will lead to the change of both retention time and nutrient supply. Therefore, it is essential to predict water quality change by simulation analysis. We have conducted several water quality simulation which deals with the change of water control in Inba marsh. Since nutrient concentration of nearby rivers is high, dilution effect is cancelled by the increase of nutrient loading. Large amount of water with relatively lower nutrient concentration stored in northern part of the marsh has potential to improve water quality of western marsh without deteriorating the water quality of other water body.