Author(s): Haodong Bai; Nozomu Yoneyama
Linked Author(s): Nozomu Yoneyama
Keywords: Tsunami simulation hazardous substance river flow water purification plant
Abstract: This study focuses on the comprehensive prediction of the impact on water intake at purification facilities due to hazardous substances discharged into the Yodo River during a potential Nankai Trough earthquake. Using a hybrid model combining a two-dimensional wide-area tsunami propagation model and a three-dimensional density current model, the study analyzes the transport of hazardous substances near the Yodogawa Barrage. Various scenarios are simulated, including changes in earthquake intensity, river flow rate, discharge location, substance density, and volume. Results show that hazardous substances discharged downstream of the dam are transferred over the barrage due to tsunami run-up, affecting both drinking and industrial water intake points. The behavior of the substances is influenced by tsunami strength, river flow, and the properties of the substances themselves. These findings emphasize the complexity of hazardous substance dispersion during a tsunami and the need for detailed multi-condition analysis to ensure water safety in the event of such natural disasters.
Year: 2025