Impact of cyclonic wind field on interaction of surge–wave computations using finite-element and finite-difference models |
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Authors: | A D Rao Indu Jain M V Ramana Murthy T S Murty S K Dube |
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Institution: | (1) Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India;(2) ICMAM Project Directorate, Ministry of Earth Sciences, NIOT Campus, Pallikaranai, Chennai, 601 302, India;(3) Department of Civil Engineering, University of Ottawa, 161 Louis-Pasteur, Ottawa, Canada, K1N 6N5 |
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Abstract: | Both finite-element and finite-difference numerical models are applied to simulate storm surges and associated currents generated
by tropical cyclones that struck the coast of Andhra Pradesh, located on the east coast of India. During a cyclone, the total
water level at any location on the coast is made up of the storm surge, surge–wind wave interaction and the tide. The advanced
circulation two-dimensional depth-integrated (ADCIRC-2DDI) model based on finite-element formulation and the two-dimensional
finite-difference model of storm surges developed at IIT Delhi, hereafter referred as IITD storm surge model, are used. These
models are driven by astronomical tides at the open ocean boundary and cyclonic asymmetric winds over the surface of the computational
domain. Comparison of model simulated sea-surface elevations with coarse and finer spatial resolutions suggests that the grid
resolution near the coast is very crucial for accurate determination of the surges in addition to the local bathymetry. The
model underpredicts surges, and the peak surge location shifts more to the right of the landfall as the spatial resolution
of the model becomes coarser. The numerical experiments also demonstrate that the ADCIRC model is robust over the IITD storm
surge model for surge computations as the coastline is better represented in the former. |
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Keywords: | Finite-element Finite-difference Storm surge Tropical cyclone Andhra Pradesh |
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