Table of Contents
International Journal of Oceanography
Volume 2016, Article ID 5834572, 8 pages
http://dx.doi.org/10.1155/2016/5834572
Research Article

Island Modeling Using Unstructured Grid during a Tropical Storm

1Department of Mathematics, Techno India University, Saltlake, Kolkata 700091, India
2Geological Survey of India, Hyderabad 500068, India
3National Centre for Medium Range Weather Forecast, Noida, Uttar Pradesh 201309, India

Received 29 October 2015; Revised 6 January 2016; Accepted 17 January 2016

Academic Editor: Leonard J. Pietrafesa

Copyright © 2016 Mourani Sinha et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The coastal wave dynamics of Agatti island situated on a coral atoll in Lakshadweep, India, having a notable topographic feature of steeper eastern shore over the western shore, is analysed in this study. A multinested model setup is generated using the global third-generation models WAM (Wave Modeling) and SWAN (Simulating Waves Nearshore). A high resolution unstructured grid is generated for the domain containing the island using SMS (Surface-Water Modeling System) interpolated with merged GEBCO (General Bathymetric Chart of the Oceans) and SRTM (Shuttle Radar Topography Mission) bathymetry. The SWAN model is integrated with a fine resolution of one minute by one minute during the tropical storm 01A (05–10 June 2004) which passed near the island. Model simulated significant wave height data when validated against satellite observations exhibited high accuracy. SWH (significant wave height) is observed to be greater for the west coast than that over the east coast of the island due to steeper eastern shore and there is widespread wave energy dissipation along the southwest direction of wave propagation during normal conditions. The one-dimensional energy density spectra generated during the storm period exhibit multimodality with structured and unstructured grids.