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Tide-surge interaction model including air bubble effects for the coast of Bangladesh. (English) Zbl 1300.93032

Summary: An estimate of water levels due to the interaction of tide and surge associated with a storm including air bubble effects is made along the coastal region of Bangladesh. For this purpose, a vertically integrated shallow water model in Cartesian coordinate system is developed introducing air bubbles and is solved using nested finite difference schemes. A fine grid model covering the region between \(21^{\circ}15'\)N to \(23^{\circ}\)N and \(89^{\circ}\)E to \(92^{\circ}\)E has been nested into a coarse grid model covering the region between \(15^{\circ}\)N to \(23^{\circ}\)N and \(85^{\circ}\)E to \(95^{\circ}\)E in the Bay of Bengal to incorporate all the major islands and coastal bending accurately. By applying tidal forcing through the southern open boundary of the coarse grid model appropriate tidal conditions are generated in the problem domain. Numerical experiments are performed with the help of the model to simulate water levels due to tide and surge interaction including air bubble effects associated with the tropical storm of April 1991. The model results are found to be reasonable and the model can be found to simulate higher water levels in the presence of air bubbles.

MSC:

93A30 Mathematical modelling of systems (MSC2010)
93C20 Control/observation systems governed by partial differential equations
65M06 Finite difference methods for initial value and initial-boundary value problems involving PDEs
93C95 Application models in control theory
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