Title: Numerical Modeling of Storm Surge Using Improved Wind Fields

Propagation of tropical cyclones and their landfall along the coast affect the livelihood of the coastal community with loss of life. The Bay of Bengal has been a source for triggering several cyclones. The present study investigates the effects of tropical and its landfall along the East Coast of India. Numerical modelling of storm surges primarily depends on the wind characteristics. The parametric cyclone models usually depicts better wind field near the cyclone centre. Unlike the parametric models, the wind fields from global models have better accuracy in the areas far away from the cyclone centre. Owing to this inconsistency, it is practical to take the wind field obtained from the global model as the background field and superimpose the wind field generated by the parametric tropical cyclone model for regions within the area in near vicinity of the cyclone centre. To overcome the deficiencies in the wind fields generated by parametric and numerical models, a merging technique is proposed to blend the winds fields. In coastal regions, the combined effects resulting from the physical processes such as tides, storm surges, waves and currents coexist, and their interactions are important to understand the individual dynamic processes. Waves generate a radiation stress gradient to force setup and currents. The knowledge on how these processes influence one another in a coastal environment is an important issue, and an active area of research of current interest. The generation of storm surges and waves are closely related to wind stresses. So investigations and modifications of different wind fields are required to improve the numerical predictions of storm surge.
Keywords: tropical cyclones, hydrodynamics, wind fields.