諌早湾締切堤の進捗に伴う湾内の水質変化の予測と評価に関する研究

概要

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In order to investigate the qualitative changes in Isahaya bay by construction of a sea dyke, field observation and numerical simulation have been carried out. Field observation was held for 12 hours at estuary of Honmyo River, main river to the Isahaya bay. Based on the analysis of observation, it becomes clear that water quality indices change periodically and some of them have peak values in the cycle. And suspended solids (SS) affect to another indices for water quality. Therefore, numerical model of SS is designed in regard to the resuspension and the deposition of particles. Calculated results show that current in the bay varies gradually with the progress of construction as well as changes of a range of wetland. The effect of deposition is dominant in the pond, consequently its influence on water quality can be considered from the bottom. Furthermore, the resuspention is occurred by the gate control, attention should be paid not to degrade the water quality.