the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Wave energy dissipation in the mangrove vegetation off Mumbai, India
Samiksha S. Volvaiker
Ponnumony Vethamony
Prasad K. Bhaskaran
Premanand Pednekar
MHamsa Jishad
Arthur James
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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Preprint
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Samiksha S. Volvaiker et al.
Interactive discussion


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RC1: 'Comments on paper', Anonymous Referee #1, 13 Sep 2017
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RC2: 'Review of "Wave energy dissapation in the mangrove vegetation off Mumbai, India', Anonymous Referee #2, 02 Oct 2017
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EC1: 'this will require a very substantial revision', Matthew Hecht, 17 Oct 2017
Interactive discussion


-
RC1: 'Comments on paper', Anonymous Referee #1, 13 Sep 2017
-
RC2: 'Review of "Wave energy dissapation in the mangrove vegetation off Mumbai, India', Anonymous Referee #2, 02 Oct 2017
-
EC1: 'this will require a very substantial revision', Matthew Hecht, 17 Oct 2017
Samiksha S. Volvaiker et al.
Samiksha S. Volvaiker et al.
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