The numerical simulation of storm surges along the Bangladesh coast |
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| Authors: | S K Dube P C Sinha G D Roy |
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| Institution: | Centre for Atmospheric Sciences, Indian Institute of Technology, Hauz Khas, New Delhi-110016 India |
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| Abstract: | Using a set of basic hydrodynamic equations governing the motion in a sea, a vertically-integrated coastal zone numerical model has been developed for the simulation of storm surges generated by the tropical stroms striking the Bangladesh coast. The model is fully nonlinear and uses a conditionally stable semi-explicit finite difference scheme for solving the relevant equations. In this model the analysis area extends from 87°E to 93°E along the south coast of Bangladesh and there are three open-sea boundaries situated along 87°E, 93°E and 19°N. With this analysis area it is possible to record, on average, 24 h of the surge generating capacity of most of the severe cyclones before landfall at the Bangladesh coast.Numerical experiments are performed with the help of this model to simulate the surges generated by several severe cyclonic storms which struck the Bangladesh coast durin the past 25 y. To compare the model predicted surges with the observed sea-surface elevations, three cyclonic storms have been chosen for which reliable observations regarding storm characteristics and the associated surges were available. The predicted peak sea-surface elevations compare well with the observed values at Chittagong port. |
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