Informatics Publishing Limited

N. Ramanujam ¹, M. V. Mukesh ¹, H. M. Sabeen ², N. B. Preeja ²

Affiliations
1 Department of Geology, V.O. Chidambaram College, Tuticorin-628 008, IN
2 Department of Geology, V.O. Chidambaram College, Tuticorn-628 008, IN

Abstract

Islands in the Gulf of Mannar are sedimentary landforms developed during the low strand of sealevel during the last interglacial period. The reefs commenced to grow along with the pace of rising sea level. Islands such as Van, Koswari, Kariashuli, Viangushuli inTuticorn region can be called as Tuticorin group of islands. The size, shape and orientation of the reef along with the wave parameters are crucial in determining the development and instability of the islands. Oval or elliptical shape of the reef, small reef area and orientation along with the major wave direction are favourable for the development of the islands, The non-elliptical shape, bigger size of the reef and irregularity in rim topography are hindrances to their development. Apart from the said factors the sea level rise and mining of reef materials are also causative factors.

Keywords

Geomorphology, Islands, Gulf of Mannar.

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N. Ramanujam ¹, V. Radhakrishnan ¹, H. M. Sabeen ¹, M. V. Mukesh ¹

Affiliations
1 Department of Geology, V. O. Chidambaram College, Tuticorin-628 008, IN

Abstract

The relationship between the surf zone processes and the morphodynamic state of beaches between Vaipar and Tiruchendur along the southeastern coast of Tamil Nadu was studied through 46 beach profile measurements and other morphological features across and along the shoreline. The energy variations in the beach along with the morphological and sedimentological properties are distinguished by the surf-scale parameter. The dissipative beaches with higher wave heights and low beach gradients yield the higher amount of surf-scale parameter (22.0 to 154.3) whereas at the other extreme, the reflective beaches with steep beach gradients and lower wave height conditions resulted with low surf-scale value (0.5711 to 2.500). Intermediate beach states possessing dissipative and reflective elements with four transitional stages are recognised.

Keywords

Coastal Geomorphology, Beach Gradient, Grain Size, Tamil Nadu.

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