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Possible methods for reducing blooms of blue-green algae in Sagami Dam, Kanagawa, Japan, by controlling hydro power discharge were considered on the basis of field measurements and numerical experiments. Field data for currents and water quality were obtained and analyzed as well as time series of temperature. The measured hydrodynamic fields were successfully reproduced by numerical computation using MIKE by DHI. Using a developed simple water quality model, we performed numerical experiments controlling the hydro power discharge and found that a change of the discharge layer from the whole to the surface layer is considered to be effective for reducing booms of blue-green algae in the dam due to enhancement of surface currents toward the outlet and reduction in the surface temperature.

Possible Methodology for Reducing Bloom of Blue-Green Algae Controlling Hydro Power Discharge in Sagami Dam, Kanagawa, Japan