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J. Mar. Sci. Eng. 2018, 6(3), 99; https://doi.org/10.3390/jmse6030099

Impact Assessment of a Major River Basin in Bangladesh on Storm Surge Simulation

1
Department of Maritime Engineering, Kyushu University, Fukuoka 819-0395, Japan
2
Department of Mathematics, Islamic University, Kushtia 7003, Bangladesh
3
Department of Civil and Environmental Engineering, Kyushu University, Fukuoka 819-0395, Japan
4
Department of Geology, Faculty of Earth and Environmental Sciences, University of Dhaka, Dhaka 1000, Bangladesh
*
Author to whom correspondence should be addressed.
Received: 27 July 2018 / Revised: 20 August 2018 / Accepted: 21 August 2018 / Published: 28 August 2018
(This article belongs to the Special Issue Coastal Zone Management)
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Abstract

A two-dimensional bay and river coupled numerical model in Cartesian coordinates was developed to find the impact of the river on the simulated water levels associated with a storm along the coast of Bangladesh. The shallow water models developed for both the bay and river were discretized by the finite difference method with forward in time and central in space. The boundaries for the coast and islands were approximated through proper stair steps representation and solved by a conditionally stable semi-implicit manner on a staggered Arakawa C-grid. A one-way nested scheme technique was used in the bay model to include coastal complexities as well as to save computational costs. A stable tidal condition was made by forcing the sea levels with the most energetic tidal constituent, M2, along with the southern open boundary of the bay model omitting wind stress. The developed model was then applied to foresee the sea-surface elevation associated with the catastrophic cyclone of 1991 and cyclone MORA. A comparative study of the water levels associated with a storm was made through model simulations with and without the inclusion of the river system. We found that the surge height in the bay-river junction area decreased by 20% and the surge height reduced by about 3–8% outside the junction area from this study. The obtained results were found to have a satisfactory similarity with some of the observed data. View Full-Text
Keywords: numerical model; storm surge; tropical cyclone; Bangladesh; finite difference method numerical model; storm surge; tropical cyclone; Bangladesh; finite difference method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Mohit, M.A.A.; Yamashiro, M.; Hashimoto, N.; Mia, M.B.; Ide, Y.; Kodama, M. Impact Assessment of a Major River Basin in Bangladesh on Storm Surge Simulation. J. Mar. Sci. Eng. 2018, 6, 99.

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