Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/38248
Title: Sedimentation And Sea-Level Variations In Nizampatnam Bay, East-Coast Of India
Authors: Rao, P Sreenivasa
Rao, G Krishna
Rao, N V N Durgaprasada
Swamy, A S R
Issue Date: Dec-1990
Publisher: NISCAIR-CSIR, India
Abstract: Nizampatnam bay is a shallow marine environment just south of the Krishna delta on the east coast of India. Holocene transgression and subsequent progradation of the Krishna delta played a major role in the evolution of the bay. Though there is wide range in the sediment types, the bay is predominantly occupied by sandy clays and sands. Coarse sandy sediments (Mz 0.96-1.4-φ), which are better sorted and negatively skewed, are mostly confined to offshore bar. Poorly sorted and positively skewed sandy clays cover the central and some nearshore areas of the bay. Coarse sand in the offshore bar and geometry of the sand body indicate a rapid rise in the sea level and overstepping of the bar. 14C dating gives an age of about 8000 y BP for the ancient strandline located at about 25 km from the present coastline. Following the sea level rise, the bar blocked off the sediments supplied by the river and led to the deposition of fine sediments throughout the bay. Widespread occurrence of sandy clay and poor sorting of the sediments give testimony to the low energy conditions in the bay caused by the offshore bar. Sand bodies in the coastal region particularly in the northwestern part of the bay are considered to be due to wave induced longshore drift of the sediments to the south. Continuous infilling of the bay is indicated by decrease in the depths during the last century.
Page(s): 261-264
URI: http://nopr.niscair.res.in/handle/123456789/38248
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.19(4) [December 1990]

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