Application of GPR in the study of shallow subsurface sedimentary architecture of Modwa spit,Gulf of Kachchh |
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Authors: | S B Shukla A K Patidar Nilesh Bhatt |
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Institution: | (1) Department of Geology, Faculty of Science, M. S. University of Baroda, Vadodara, 390 002, India |
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Abstract: | The coastline constitutes a very sensitive geomorphic domain constantly subjected to dynamic coastal processes. The study
of its ever-changing physiography and stratigraphy provides a wealth of information on its history and evolution, in many
cases at decadal and annual scales. The present study was carried out on the Modwa beach complex between Rawal Pir and Modwa,
about 10 km east of Mandvi on the northern coast of the Gulf of Kachchh. The Modwa spit is a 7-km long WNW-ESE trending prograding
amalgamated beach ridge complex that is about 0.5 km wide at its western end and 1.5 km wide at its eastern end. This Ground-Penetrating
Radar (GPR) survey delineated a variety of the radar surfaces and radar facies which reflects not only large scale sedimentary
architecture, but depositional facies of the beach ridge complex. These are bounding surfaces separating the radar facies
outline beach ridge (br), washover (wo), coastal dune (cd) and swale (sw) depositional environments. The internal sedimentary
structures like tangential, parallel, concave and convex upward stratifications could also be visualized from the GPR profiles.
The architecture suggests the formation of this complex due to a combined process of eastward littoral drift of locally derived
sediments and its onshore deposition by storms and eolian activities. |
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Keywords: | Ground-Penetrating Radar radar stratigraphy coastal geomorphology Gulf of Kachchh |
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