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JDR Vol.13 No.4 pp. 767-779
doi: 10.20965/jdr.2018.p0767
(2018)

Paper:

High Resolution Numerical Model for Salinity Transport in Rivers During a Tsunami Attack

Hiroshi Nagashima*,† and Nozomu Yoneyama**

*NEWJEC Inc.
2-3-20 Honjo-higashi, Kita-ku, Osaka 531-0074, Japan

Corresponding author

**Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan

Received:
December 11, 2017
Accepted:
April 22, 2018
Published:
August 1, 2018
Keywords:
tsunami, salinity, 3D numerical analysis, estuary barrage, water purification
Abstract

In the event of a tsunami, saltwater flows into rivers and water purification plants must stop taking water from rivers to prevent entry of saline water into the plant owing to potential damage to machinery and contamination of the system. This leads to interruption of water supply during disaster. In this study, a salinity transport simulation model that can carry out a three-dimensional salinity behavior analysis in a specific area and a horizontal two-dimensional tsunami propagation analysis simultaneously was developed to predict saltwater behavior in rivers during a tsunami. These models are structured so that the influence of the boundary of the 3D domain can be excluded without significantly increasing the calculation load. The model was used to simulate saltwater behavior in the Yodo River in Japan during a tsunami. The spatial distribution and temporal change of saltwater under various river flows were quantitatively predicted, and the effectiveness of possible countermeasures in diminishing the duration of water-intake shutdown and the presence of brackish water in upstream areas was assessed.

Cite this article as:
H. Nagashima and N. Yoneyama, “High Resolution Numerical Model for Salinity Transport in Rivers During a Tsunami Attack,” J. Disaster Res., Vol.13, No.4, pp. 767-779, 2018.
Data files:
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Last updated on Oct. 23, 2018