TITLE:
Areal Extent of Erosion and Accretion in and around the Gahirmatha Coast, NW of Bay of Bengal by Remote Sensing and GIS Analysis of Multi-Temporal Satellite Imagery
AUTHORS:
Balabathina Veeraanarayanaa, Kandula Ravikumar, Talluri Ramesh, Mopada Venkateswararao, Pattam N. Sridhar
KEYWORDS:
Accretion, Erosion, Morphology, Coast, Temporal Satellite Data
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.7,
July
24,
2015
ABSTRACT: The shoreline morphology change due to
erosion and deposition is a major concern for coastal zone management. In the
present study, a highly dynamic coast of Gahirmatha on Bay of Bengal in
northeast India is experiencing active erosion, which is mainly wave and tide
erosion related hazard threat ending human habitation and sustainability of the
coast. In our study, high resolution satellite imagery of time series provided
detailed sequence of coastal morphology and their changes in all respects.
Comparison study of relative shoreline positions on time series satellite data
spanningthree decades from 1973 to 2004 covering for the years of 1973,
1983, 1987, 1990, 1998, 2000 and 2004, provided regional changes with
accelerated erosion and accretion. The result of the studieshave revealed
that the areas of severe erosion found along the coast are confined to the
promontories of the present day mouths itself of the Baitrani at Dhamra and
Brahmani at Maipura inlets. In this background, it is significant to understand
the magnitude of factors that are responsible for prograding or retrograding of
coast. The present study is an attempt in this direction.