Author(s): N. Yoneyama; H. Matsumiya; R. Samejima
Linked Author(s): Nozomu Yoneyama
Keywords: Tsunami; River weir; Salt water; Water purification plant; Three-dimensional numerical analysis
Abstract: Water purification plants are generally located upstream from an estuary weir to avoid drawing salt water. If a significantly large tsunami manages to flow into a river and run up beyond the weir, the purification plant must stop intake because it may draw salt water. Here, a three-dimensional numerical analysis code is presented to predict salt behavior in rivers exposed to a tsunami flow. The main features of this code are as follows: (1) it treats the fluid flow as a three-dimensional density current; and (2) it applies the VOF method to water surface analysis. This code was applied to the Yodo River, Japan, for predicting the chlorine ion concentration that will arise near the Kunijima water purification plant, which draws water from the river, if a significantly large tsunami occurs. Using this code, it was found that the concentration will exceed the drinking water standard for around 1 h and reach 10,000 mg/L at maximum.
Year: 2011