Journal of Coastal Conservation

, Volume 21, Issue 1, pp 1–13 | Cite as

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

  • V. Sanil Kumar
  • P. R. Shanas
  • G. Udhaba Dora
  • Johnson Glejin
  • Sajiv Philip
Article
  • 209 Downloads

Abstract

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 %.

Keywords

Coastal engineering Coastal zone management Longshore sediment transport Nearshore currents Nearshore waves Nearshore dynamics 

Notes

Acknowledgments

This work is part of the supra Institutional project funded by Council of Scientific & Industrial Research, New Delhi and the shoreline management plans for Karnataka coast funded by Integrated Coastal and Marine Area Management Project Directorate, Ministry of Earth Sciences, New Delhi. Director, CSIR-NIO, Goa and Project Director, ICMAM PD, Chennai provided encouragement to carry out the study. We thank Mr. P. Pednekar and Mr. Jai Singh for the help provided during the wave measurement. This paper is NIO contribution 5949.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • V. Sanil Kumar
    • 1
  • P. R. Shanas
    • 1
    • 2
  • G. Udhaba Dora
    • 1
  • Johnson Glejin
    • 1
  • Sajiv Philip
    • 1
  1. 1.Ocean Engineering DivisionCSIR-National Institute of Oceanography (Council of Scientific & Industrial Research)Dona PaulaIndia
  2. 2.Marine Physics DepartmentKing Abdulaziz UniversityJeddahSaudi Arabia

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