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Title: Estimation of pressure drop and storm surge height associated to tropical cyclone using Doppler velocity
Authors: Pradhan, Devendra
Mitra, Anasuya
De, U K
Keywords: Tropical cyclone
Storm surge height
Central pressure drop
Radial velocity
Cyclonic storm
Issue Date: Jun-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 92.60.hv; 92.60.Qx
Abstract: A study of five tropical cyclones in the Bay of Bengal has been conducted to estimate the pressure drop in the eye of the cyclone and associated storm surge height using Doppler velocity data. A new value of constant K (13.637) has been found in the empirical relation Vmax = K√(P-Pc) between maximum velocity (Vmax) and central pressure drop (P-Pc) in terms of maximum radial velocity measured by the Doppler Weather Radar (DWR) for coastal region of India. The present study provides an alternate method for estimating central pressure drop and expected storm surge height associated to a tropical cyclone. The study also reveals that the storm surge height estimated from Doppler velocity measurements for these cyclones is very close to the actual occurrence. The results of pressure drop estimates from Doppler velocity are in close agreement with the satellite estimates. It is also observed that DWR estimates are sometimes better than those from satellite. However, the limitation of DWR is the limited range of observation (400 km) and shorter duration of cyclone tracking.
Page(s): 348-358
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.41(3) [June 2012]

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