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Geomorphological Evolution and Coastline Change of Sandwip Island, Eastern GBM Delta, Bangladesh

By Uddin M. and Ciavola P.


The Lower Meghna River Estuary is a very dynamic estuarine system experiencing dramatic geomorphological changes of its offshore islands. Erosion and accretion rates are extremely high and the islands migrates southwards along with reducing the original sizes. An attempt has been made to study a time series of recent geomorphological changes in the shorelines of Sandwip Island using Landsat satellite imagery of 1978, 2001 and 2006 obtained from the Global land Cover facility (GLCF). The analysis showed, among other things, that the shoreline erosion is dominant in the south and south eastern parts of the island, while large new emerged parts are accreting in the north and north-western part of the island. The Island has accreted 3.8 km (maximum) and 0.7 km respectively in the northern and eastern part from 1978 to 2001. Image analysis also showed that the cliffs on the south and south-eastern parts have eroded respectively 1.8 km and more than 2.6 km over this 23 year period. The comparison of images captured between 1978-2006 shows that erosion is migrating towards the southern and south-eastern parts of the island

Topics: Bangladesh, coastal erosion, remote sensing
Publisher: Giraldi Editore
Year: 2012
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