Quaternary Geomorphic Evolution of the St. Martin’s Island in Bangladesh

Author(s): Dr. M. Shahidul Islam   Abdul Hoque   M. Rabi Uzzaman

Journal Name: Indian Journal of Geography and Environment

Volume & Link: 6 Nos: 1 & 2

Publisher: Vidyasagar University , Midnapore , West-Bengal , India

Year: 2001

Abstract:

 

The St. Martin's island is the only coral bearing offshore island ofBangladesh with an area ofabout 8 km2. In this paper the Quaternary geomorphic evolution of the island has been reconstructed. The island is structurally controlled and its present landform has been shaped by four major factors. such as sea-level change; tectonic activities: geomorphic process and anthropogenic activities. During the Pleistocene period. the exposed outcrop at Dakshinpara was deposited, which has been identified as the Pleistocene shoreline at about 6 m above the present sea level. The mid-Holocene slow rise of sea level with some sequence ofregressions was suitable to accumulate coral reef within the tidal range of the island. Boulders and conglomerates of cemented calcium carbonates ann fossiliferous materials were also deposited along with rocky corals. Late-Holocene sand accumulation accelerated the process of dune formation. During this period due to rapid siltation by tide. wind and wave Uttarpara and Dakshinpara became well connected. the area near Galachipa became much wider than 'today and the island got nearly its present shape. In recent years due to increasing number of population. human activities and unplanned tourist influx. the landform and physical environmental setting of the island have become fragile. Moreover. human activities in the mainland. particularly changing land use pattern
and erosion from hill surface have lead sediment to disperse in to this part of the shelf, which eventually affect the physical shape of the island

 

Citation:

Islam M. S., Hoque A. and Uzzaman M. R. (2002) Quaternary Geomorphic Evolution of the St. Martin’s Island in Bangladesh, Indian Journal of Geography and Environment, 6, 1&2, 1-24

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