Geomorphology and Ground Penetrating Radar Profiles of Holocene Coastal Dune, Western Coastal Plain of the Gulf of Thailand
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Abstract
At Bang Berd Bay, a remarkable wind blown sand dune lies almost parallel to the present coastline with its highest elevation about 20 m above the present mean sea level. The formation of sand dune here has not yet concluded. This paper shows a result of Ground Penetrating Radar (GPR) to visualize the invisible dune structures as well as applying a remote sensing data to map the distribution. As a result from aerial photograph
interpretation, dune morphology shows a majority of parabolic and transverse patterns. GPR profiles revealed some obvious macro-scale sedimentary patterns, clear boundary of dune overlying on the prograded beach ridge plain. Based on macro-scale sedimentary patterns, lee and stoss angles of some burial dunes from GPR signals and dune morphology indicated the direction of wind blown mainly from the east to the west. Series of beach ridges underneath sand dune indicated seaward progradation. This seaward progradation of beach ridges inferred its formation possibly after the mid-Holocene highstand. Thus, the formation of dune may have occurred during a dry condition probably during and after the mid-Holocene regression. OSL datings also reveal that the upper part of dune profile depth at 1-3 m formed between 2,220 to 2,960 years ago.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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