2022 Volume 78 Issue 2 Pages I_823-I_828
In many cities, river water is used for drinking and industrial water. Therefore, when a chemical substance flows into a river, the water supply is stopped while it stays near the water intake of the water purification plant, which adversely affects the lives of the citizens. It is expected that such a situation will occur even during a large earthquake.
In this study, the chemical substance transport was analyzed and the influence on water intake was examined in Yodo River during a Tsunami attack, using 2DH-3D hybrid model that can analyze the propagation of a tsunami from a wave source in plane two dimensions and the local flow in three dimensions including the density difference. As a result of comparing the behavior of chemical substances under the condition that the salinity of river water is different, the influence on water intake was the largest under the condition that the salinity difference between the upstream side and the downstream side of the barrage was large. It was shown that the behavior of chemical substances is greatly affected by the salinity, and it was found that consideration of salinity is indispensable when predicting the behavior of chemical substances.
