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Longshore sediment transport in the surf zone based on different formulae: A case study along the central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Longshore sediment transport in the surf zone based on different formulae: A case study along the central west coast of India
 
Creator SanilKumar, V.
Shanas, P.R.
Dora, G.U.
Johnson, G.
Philip, C.S.
 
Subject Geology and geophysics
Law, policy and social sciences
Oceanography and limnology
Oceanography and limnology
 
Description Understanding longshore sediment transport (LST) is a prerequisite for designing an effective coastal zone management strategy. The present study estimates the LST along the central west coast of India based on four bulk LST formulae: (1) the Coastal Engineering Research Center (CERC) formula, (2) the Walton and Bruno formula, (3) the Kamphuis formula and (4) the Komar formula. The Delft3D–wave module is used for estimating nearshore waves with measured directional wave data at a water depth of 9 m as the input parameter. Wave data for the validation of the nearshore wave transformation model is measured using the InterOcean S4DW wave gauge. The model results show that waves approach from the south 90 % of the time in a year and that they generate predominantly northerly longshore currents. Upon comparison with the measured data, the findings show that the estimates based on the Kamphuis formula agree with the field data. A high ratio (~1) of the monthly net and gross transport rates indicates that the LST is dominating in one direction in all months except February and July. The study shows that a slight change in the angle of the wave approach during the Asian summer monsoon period (JJAS) can significantly alter the direction and magnitude of the LST. Inter-annual variations in the LST based on the data for 2009 and 2011 show that the variations in the annual net and gross LST rates in different years are less than 7 %.
 
Date 2017-09-27T13:09:34Z
2017-09-27T13:09:34Z
2017
 
Type Journal Article
 
Identifier Journal of Coastal Conservation, vol.21(1); 2017; 1-13
http://drs.nio.org/drs/handle/2264/5192
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2017] Springer.
 
Publisher Springer