NDLI: Assessment of coastal dune characteristics using georadar imaging and sedimentological analysis: Odisha and Visakhapatnam, India

Content Provider	Springer Nature Link
Author	Devi, K. Raicy, M. C. Trivedi, Deshraj Srinivasan, P. Murthy, S. G. N. Goble, Ronald J. Nair, Rajesh R.
Copyright Year	2013
Abstract	The East coast of India is subject to continuous changes by high energy events. We sought to assess the depositional conditions along the coast from the geophysical and sedimentological character of the dune sands of the Gopalpur and Paradeep coast of Odisha, and the Sagarnagar coast of North Visakhapatnam. Quartz layers of the heavy mineral-rich zone collected at a depth of ~2 m from the landward foot of the dunes in the Visakhapatnam and Odisha coast, gave the OSL age estimates as 1,050 ± 50 and 260 ± 10 years respectively, revealing that the age of the dunes in Visakhapatnam are older than those on the Odisha coast. Episodic high energy events have affected the coast. Evidence from ground penetrating radar data consists of three stratigraphic units. The upper unit consists of vague reflections, parallel to the ground in continuous manner, most probably formed by wind action. On the other hand, the middle layer shows high amplitude reflections of heavy mineral-rich massive layers, possibly the result of tsunami activity. The lower massive layer parallel to the ground surface shows a low reflection pattern. The GPR studies showed that the thickness of the heavy mineral layers is greater on the landward foot of the dune as compared to that on the seaward side. According to the grain size analysis, the dune is composed of both wind generated and tsunamigenic sediments. The scanning electron microscope studies revealed that the heavy minerals present in the dunes are mainly sillimanite, ilmenite, garnet, pyroxene, rutile, sphene, biotite, hornblende, zircon, monazite and magnetite. The study demonstrates the origin of sand dunes in different ages along the East Coast of India by the effect of various natural phenomena.
Starting Page	729
Ending Page	742
Page Count	14
File Format	PDF
ISSN	14000350
Journal	Journal of Coastal Conservation
Volume Number	17
Issue Number	4
e-ISSN	18747841
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-08-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heavy minerals Tsunami Depositional history Stratigraphy Sedimentology Geography (general) Coastal Sciences Oceanography Nature Conservation Remote Sensing/Photogrammetry
Content Type	Text
Resource Type	Article
Subject	Ecology Nature and Landscape Conservation Oceanography

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