INTERNATIONAL SYMPOSIUM ON INFORMATION TECHNOLOGY IN OCEANOGRAPHY (ITO-98) GOA, INDIA 12-16 OCTOBER 1998

 Storm surges associated with severe cyclonic storms are of common occurrences along the East Coast of India. The coastal districts of Orissa have experienced major surges in the past. Storm surges and the rains associated with cyclones are major causes for coastal flooding in this region. Damages can be minimized if the storm surges are forecasted well in advance. An attempt has been made in this paper to simulate surges along the Orissa coast using the data of past severe cyclones. In the present study, we develop a location specific fine resolution model for Orissa coast on the lines similar to that of IIT-D storm surge model. The model runs on a personal computer. The analysis region is from Kalingapatnam to Contai i.e., starting from 18" latitude to 22' latitude. And in longitudinal direction it is extended from 840 to 900. One of the important features of the model is that instead of generating a smoothed bathymetry by using a function from spot depths, we use the actual bathymetry extracted from a very fine resolution naval hydrographic charts for the region extending from the south of Orissa to south of west Bengal. A simple drying scheme has also been included in the model in order to avoid the exposure of land near the coast due to strong negative surges. Attempt has also been made to test the reliability of the model by validating it for various cyclones which struck the Orissa coast during 1971, 1982 and 1985. Numerical experiments are carried out for computation of surges using the cyclone forcings of above cyclones.

The results emphasizes the suitability of fine resolution surge model for reasonable prediction of surges along the Orissa coast. Development of fine resolution numerical models with actual bathymetry is seemingly a better option than the whole East Coast model. The model results reported in the present study are in good agreement with available peak surge observationslestimates.

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Copyright© National Institute Of Oceanography, Goa,India,1998
updated on 7th July'98