Characteristics of the salinity flux at the mouth of Lake Koyama-ike

Mori Akihiro, Naruoka Tomohiro, Hioki Yoshiyuki

doi:10.60290/laguna.30.0_11

Seawater backflow from the Sea of Japan is controlled by operating the flood gate on the Koyama River between the Sea of Japan and Lake Koyama-ike, a brackish lake in the Sanin region. An attempt was made to evaluate the salinity flux at the mouth of Lake Koyama-ike quantitatively, focusing on the effect of salinity on the ecosystem of the lake. The salinity and flow rates were monitored using electrical conductivity loggers and Doppler flow meter readings obtained every 10 min at various depths from August 8, 2021 to October 21, 2021. Based on the observed results, the salinity flux at the mouth of Lake Koyama-ike was estimated to be 0.09–5.82 kg/m2/s into the lake. When the salinity flux was high, the water level difference between the lake and the downstream site of the flood gate was large, the opening of the flood gate was large, and the salinity concentration was high at the downstream site of the flood gate. However, the results suggest that when the salinity flux is small, the flood gate opening is small, salinity concentration at the downstream site of the flood gate is low, and backflow time tends to be short.

Characteristics of the salinity flux at the mouth of Lake Koyama-ike

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