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Preprints
https://doi.org/10.5194/os-2017-49
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2017-49
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Aug 2017

09 Aug 2017

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This preprint has been withdrawn by the authors.

Wave energy dissipation in the mangrove vegetation off Mumbai, India

Samiksha S. Volvaiker1, Ponnumony Vethamony1, Prasad K. Bhaskaran2, Premanand Pednekar1, MHamsa Jishada, and Arthur James3 Samiksha S. Volvaiker et al.
  • 1Physical Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa – 403 004, India
  • 2Department of Ocean Engineering and Naval Architecture, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India
  • 3Department of Marine Science, Bharathidasan University, Tiruchirappalli
  • apresently at: Space Applications Centre, Ambawadi Vistar, P.O., Ahmedabad – 380015, India

Abstract. Coastal regions of India are prone to sea level rise, cyclones, storm surges and human induced activities, resulting in flood, erosion, and inundation. The primary aim of the study is to estimate wave attenuation by mangrove vegetation using SWAN model in standalone mode, as well as SWAN nested with WW3 model for the Mumbai coastal region. To substantiate the model results, wave measurements were carried out during 5–8 August 2015 at 3 locations in a transect normal to the coast using surface mounted pressure level sensors under spring tide conditions. The measured data presents wave height attenuation of the order of 52 %. The study shows a linear relationship between wave height attenuation and gradual changes in water level in the nearshore region, in phase with the tides. Model set-up and sensitivity analyses were conducted to understand the model performance to vegetation parameters. It was observed that wave attenuation increased with an increase in drag coefficient (Cd), vegetation density, and stem diameter. For a typical set-up for Mumbai coastal region having vegetation density of 0.175 per m2, stem diameter of 0.3 m and drag coefficient varying from 0.4 to 1.5, the model reproduced attenuation, ranging from 49 to 55 %, which matches well with the measured data. Spectral analysis performed for the cases with and without vegetation very clearly portrays energy dissipation in the vegetation area as well as spectral changes. This study has the potential of improving the quality of wave prediction in vegetation areas, especially during monsoon season and extreme weather events.

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Samiksha S. Volvaiker et al.

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Samiksha S. Volvaiker et al.

Samiksha S. Volvaiker et al.

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