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Water 2018, 10(2), 110; https://doi.org/10.3390/w10020110

A Numerical Approach to Predict Water Levels in Ungauged Regions—Case Study of the Meghna River Estuary, Bangladesh

1
Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, Korea
2
International Center for Urban Water Hydroinformatics Research & Innovation, Incheon 21999, Korea
*
Author to whom correspondence should be addressed.
Received: 26 October 2017 / Revised: 17 January 2018 / Accepted: 17 January 2018 / Published: 27 January 2018
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Abstract

Quantitative flood frequency investigation in a large estuary is somewhat challenging by numerical modelling, because the model optimization depends on the appropriate physical and hydrodynamic properties of the estuarine river. This study attempts to solve the bathymetry configurations of the Meghna River estuary and the assimilation of flow data, which exposed an important role in water level prediction. Upstream flow rates and nonlinear semidiurnal tides have an impact on the instability of the flow in this estuarine river. A large amount of flow accumulates in the upstream confluence against or in favor of tides during the rainy season from the adjacent river basins and significantly moves in the Bay of Bengal. The aim of this study is to predict water levels in the un-gauged regions of the Meghna River estuary. A numerical technique was developed using Mike21 flexible mesh, comprising shallow water hydrodynamic components in the estuary. Subsequently, log-normal distribution was employed to analyze the flood magnitudes among the ungauged stations of the estuary. The calibration results comprised with the observed water levels adequately. In conclusion, these water level prediction results can be applied to alleviate the coastal land from extreme flooding and to design hydraulic structures in the narrow streams. View Full-Text
Keywords: estuarine river; hydrodynamic; ungagged region; water level; flood frequency estuarine river; hydrodynamic; ungagged region; water level; flood frequency
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Syed, Z.H.; Choi, G.; Byeon, S. A Numerical Approach to Predict Water Levels in Ungauged Regions—Case Study of the Meghna River Estuary, Bangladesh. Water 2018, 10, 110.

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