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ISSN: 2473-3350

Journal of Coastal Zone Management
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Research Article

Evolution of Diverging Spits Across the Tropical River Mouths, Central West Coast of India

Hegde VS1*, Nayak SR2, Krishnaprasad PA3, Rajawat AS4, Shalini R5and Jayakumar S6

1SDM College of Engineering and Technology, Dharwad, Karnataka, India

2Ministry of Earth Sciences, Government of India, India

3SDM Institute of Technology, Ujire, Karnataka, India

4Space Application Centre, Ahmedabad, India

5Global Academy of Technology, Bangalore, India

6National Institute of Oceanography, Douna Paula, Goa, India

*Corresponding Author:
Dr. Hegde VS
SDM College of Engineering and Technology
Dharwad, Karnataka, India
Tel: +91-80-2341627
E-mail: [email protected]

Received April 06, 2015; Accepted April 18, 2015; Published April 28, 2015

Citation: Hegde VS, Nayak SR, Krishnaprasad PA, Rajawat AS, Shalini R, et al.(2015) Evolution of Diverging Spits Across the Tropical River Mouths, Central West Coast of India. J Coast Zone Manag 18:402. doi:10.4172/2473-3350.1000402

Copyright: ©2015 Hegde VS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

The evolution of a diverging spit-one growing northward and another southward across the Baindur and Yadamavina River mouths along the Central west coast of India is examined using remote sensing data, seasonal variations in the foreshore profiles, textural characteristics of the foreshore sediments, and wave-current patterns. Remote sensing data indicated lengthening of the southern spit across the Yedamavina River by 168 m between the period 1973 and 1989, while the northern spit across the Baindur River showed relative stability. Finer sediments were observed towards the ends of the spit in both northern and southern spits. Waves approach from the west between March and May, generating wave divergence and convergence cause sediment movement on either side. The alongshore current is northward from October to November and southward from December to February. This reversal in the direction of alongshore drifts, and wave divergence prevailing in this tropical climate favor sediments movement on either side leading to diverging spits to develop. As a result of the diverging spits, both the rivers are shifting their mouths in the respective directions leading to erosion of the opposite bank. In order to prevent the erosion due to shifting of the river mouths, sediments flux to the central part of the mainland shoreline from which sediments move either side leading to spit growth needs to be checked.

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