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Study of wind speed attenuation at Kavaratti Island using land-based, offshore, and satellite measurements

DRS at CSIR-National Institute of Oceanography

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Title Study of wind speed attenuation at Kavaratti Island using land-based, offshore, and satellite measurements
 
Creator Joseph, A.
Rivankar, P.
Balakrishnan Nair, T.M.B.
 
Subject wind speed
attenuation
 
Description The role of dense coconut palms in attenuating the wind speed at Kavaratti Island, which is located in the southeastern Arabian Sea, is examined based on land-based and offshore wind measurements (U sub(10)) using anchored-buoy-mounted and satellite-borne sensors (QuikSCAT scatterometer and TMI microwave imager) during an 8-year period (2000-2007). It is found that round the year monthly-mean wind speed measurements from the Port Control Tower (PCT) located within the coconut palm farm at the Kavaratti Island are weaker by 15-61% relative to those made from the nearby offshore region. Whereas wind speed attenuation at the island is approx. 15-40% in the mid-June to mid-October south-west monsoon period, it is approx. 41-61% during the rest of the year. Wind direction measurements from all the devices overlapped, except in March-April during which the buoy measurements deviated from the other measurements by approx. 20 degrees. U sub(10) wind speed measurements from PCT during the November 2009 tropical cyclone "Phyan" indicated approximately 50-80% attenuation relative to those from the seaward boundary of the island's lagoon (and therefore least influenced by the coconut palms). The observed wind speed attenuation at Kavaratti Island is attributable to the decline in wind energy transmission from the seaward boundary of the coconut palm farm with distance into the farm. Just like mangrove forests function as bio-shields against forces from oceanic waves and stormsurges through their large above-ground aerial root systems and standing crop, and thereby playing a distinctive role in ameliorating the effects of catastrophies such as hurricanes, tidal bores, cyclones, and tsunamis, the present study provides an indication that densely populated coconut palms and other tall tree vegetation would function as bio-shields against the damaging effects of storms through attenuation of wind speed.
 
Date 2012-07-23T06:53:42Z
2012-07-23T06:53:42Z
2012
 
Type Journal Article
 
Identifier Ocean Sensing and Monitoring. Eds. by: Hou, W.W.; Amone, R.(Proc. SPIE). , vol.8372; 2012; 837217; 10pp.
http://drs.nio.org/drs/handle/2264/4080
 
Language en
 
Rights Copyright 2012 Society of Photo-Optical Instrumentation Engineers. This paper was (will be) published in [Proc. of SPIE Vol. 8372, 837217] and is made available as an electronic reprint (preprint) . One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
 
Publisher Society of Photo-Optical Instrumentation Engineers