Effect of estuarine flow on ocean circulation using a coupled coastal-bay estuarine model: an application to the 1999 Orissa cyclone |
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Authors: | A D Rao Sujata Dash Indu Jain 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) Defence Terrain Research Laboratory, Metcalfe House, Delhi, India;(3) Indian Institute of Technology, Kharagpur, India |
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Abstract: | A coupled coastal-bay estuarine numerical model is described and applied to investigate the combination of wind-estuarine
driven circulation off the Orissa coast. The model is based on coupling of a 2-dimensional estuarine model with a 3-dimensional
coastal-bay model. The models are linked through the elevation at the interface. Using the coupled model, the numerical experiments
are carried out to elicit the dynamical linking between the estuarine outflow and the coastal ocean to simulate the ensuing
adjoining coastal circulation. During the southwest monsoon, it is noticed that the estuarine discharge from the northern
head-bay river system and the river systems that join the Bay of Bengal along the Orissa coast would sufficiently modify the
coastal circulation along the coast. Numerical experiments are also carried for the model simulation of surges generated by
the 1999 Orissa cyclone. It is shown that the estuarine system would influence significantly on surge development and associated
inundation through the rivers. |
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Keywords: | Estuarine flow Coastal circulation Numerical model Storm surges Inundation |
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