Numerical simulation of the surge generated by the 1977 Andhra cyclone

Johns, B. ; Dube, S. K. ; Mohanty, U. C. ; Sinha, P. C. (1981) Numerical simulation of the surge generated by the 1977 Andhra cyclone Quarterly Journal of the Royal Meteorological Society, 107 (454). pp. 919-934. ISSN 0035-9009

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Three different numerical models are used to simulate the surge generated by the 1977 Andhra cyclone. In each of these we simulate the effect of three days of wind-stress forcing before landfall of the cyclone at the Andhra Pradesh coast. the analysis area in the first model includes the entire Bay of Bengal north of 6°N and utilizes a curvilinear boundary treatment to represent the coastlines. the second model is a coastal zone model extending along the east coast of India, again utilizing a curvilinear treatment of the coastline. In the third model, which again covers the entire Bay of Bengal, the coastlines are represented by a conventional stepwise procedure. Using available data on the Andhra cyclone as a guide in representing the effect of wind-stress forcing in our models, we compare the predicted rise in the sea-surface elevation obtained from each of these with estimates based on reports received from Andhra Pradesh after the disastrous flooding in that region. Each of the three models produces a qualitatively similar surge response. the slight quantitative differences are explained in terms of the different boundary treatments. the predicted peak surface elevation above mean sea-level compares well with the estimated 5 m reported along part of the Andhra Pradesh coast south of Masulipatnam.

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Deposited On:08 Dec 2010 13:32
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