Abstract
Terauchi Dam Reservoir in Kyushu, Japan has supplied water for paddy field irrigation and domestic consumption. During recent years it has shown serious deterioration of water quality, especially in summer. Thermocline destruction is prohibited to maintain desirable temperature downstream of the reservoir for paddy field irrigation; thus, most of the existing control devices cannot be applied to the reservoir. Algal blooms in the reservoir, two vertical curtains, having depths to cover the epilimnion thickness, were installed across the reservoir to curtail the nutrient supply from the nutrient-rich inflow to the downstream epilimnion off the reservoir. Withdrawal level was also regulated to keep the downstream epilimnion off the nutrient supply. The results of this study illustrate the consequences of curtains on algal blooms in the reservoir. This method can mostly be applied for a reservoir or lake having an elongated shape.
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