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Journal of Ecology and Environmental Sciences


SEA LEVEL RISE AND SUBMERGENCE OF SUNDARBAN ISLANDS : A TIME SERIES STUDY OF ESTUARINE DYNAMICS

RAHA A.K.1*, MISHRA A.2, BHATTACHARYA S.3, GHATAK S.4, PRAMANICK P.5, DEY S.6, SARKAR I.7, JHA C.8
1Department of Forest and Environment Science, Techno India University, Salt Lake, Kolkata- 700 091, WB, India.
2Department of Forests, GIS Cell, Government of West Bengal, Kolkata- 700 098, WB, India.
3Department of Forest, Government of West Bengal, Salt Lake, Kolkata- 700 091, WB, India.
4Department of Forest, Government of West Bengal, Wildlife Division, Jalpaiguri- 736 122, WB, India.
5Department of Oceanography, Techno India University, Salt Lake, Kolkata- 700 091, WB, India.
6Department of Forests, GIS Cell, Government of West Bengal, Kolkata- 700 098, WB, India.
7Department of Forests, GIS Cell, Government of West Bengal, Kolkata- 700 098, WB, India.
8Forestry and Ecology Group, National Remote Sensing Centre, Hyderabad- 500 037, AP, India.
* Corresponding Author : atanu_raha@hotmail.com

Received : 10-07-2014     Accepted : 30-07-2014     Published : 05-08-2014
Volume : 5     Issue : 1       Pages : 114 - 123
J Ecol Environ Sci 5.1 (2014):114-123
DOI : http://dx.doi.org/10.9735/0976-9900.5.1.114-123
Keywords : Sundarban estuary, Submergence of island, Accretion in Sundarban, Ghoramara, Sea level rise, Climate change, Satellite image-ries, Time series analysis, Jambudwip, False Colour Composites (FCC)
Conflict of Interest : None declared

Cite - MLA : RAHA A.K., et al "SEA LEVEL RISE AND SUBMERGENCE OF SUNDARBAN ISLANDS : A TIME SERIES STUDY OF ESTUARINE DYNAMICS." Journal of Ecology and Environmental Sciences 5.1 (2014):114-123. http://dx.doi.org/10.9735/0976-9900.5.1.114-123

Cite - APA : RAHA A.K., MISHRA A., BHATTACHARYA S., GHATAK S., PRAMANICK P., DEY S., SARKAR I., JHA C. (2014). SEA LEVEL RISE AND SUBMERGENCE OF SUNDARBAN ISLANDS : A TIME SERIES STUDY OF ESTUARINE DYNAMICS. Journal of Ecology and Environmental Sciences, 5 (1), 114-123. http://dx.doi.org/10.9735/0976-9900.5.1.114-123

Cite - Chicago : RAHA A.K., MISHRA A., BHATTACHARYA S., GHATAK S., PRAMANICK P., DEY S., SARKAR I., and JHA C. "SEA LEVEL RISE AND SUBMERGENCE OF SUNDARBAN ISLANDS : A TIME SERIES STUDY OF ESTUARINE DYNAMICS." Journal of Ecology and Environmental Sciences 5, no. 1 (2014):114-123. http://dx.doi.org/10.9735/0976-9900.5.1.114-123

Copyright : © 2014, RAHA A.K., et al, Published by Bioinfo Publications. 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 Sundarban mangrove ecosystem in the deltaic complex of the Rivers Ganga, Brahmaputra and Meghna is shared between Bangladesh (62%) and India (38%) and is the world’s largest coastal wetland. Enormous load of sediments carried by the rivers used to contribute to its expansion and dynamics. The total area of Indian Sundarban region is about 9630 sq. km., out of which the Reserved Forest occupies nearly 4260 sq. km. At present, out of 102 islands of the Indian Sundarban region, 54 are inhabitated with a population of about 4.2 million (2011 census) and the rest of 48 islands are Reserved Forest with mangrove vegetation. A few studies were conducted in the past to monitor the changes in a few islands of Sundarban estuary which had been identified as most vulnerable in terms of coastal erosion, submergence and flooding due to surge and sea level rise. In the present study, nine southern-most islands of Indian Sundarban estuary, facing the Bay of Bengal, were studied for the period 1999 till 2013, through time-series analysis of satellite imageries. The study showed that while a few islands were undergoing gradual erosion. it also revealed continuous emergence of a few more new islands. The present study has tried to establish that other factors like destruction of mangrove vegetation, sediment deposition, natural subsidence and lack of fresh water flow can have more impact on the dynamics of Sundarban islands than the single factor of sea level rise.

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