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Journal of Applied Remote Sensing • Open Access

Comparison of sea-level measurements between microwave radar and subsurface pressure gauge deployed at select locations along the coast of India
Author(s): Prakash Mehra; Ramachandra G. Prabhudesai; Antony Joseph; Vijay Kumar; Yogesh Agarvadekar; Ryan Luis; Lalsab Nadaf

Paper Abstract

Sea-level data are obtained from several remote and coastal locations using absolute pressure gauges deployed at known level, known as chart datum. However, to yield correct sea-level measurements from absolute pressure measurements, it is necessary to take into account the atmospheric pressure and water density at the measurement locations. We used data collected from microwave radar and an absolute pressure gauge deployed at Verem, Goa (January 2009 to May 2010), Tuticorin, and Mandapam, Tamil Nadu (June 2010 to March 2011) to carry out comparative studies. The root-mean-square difference between the estimated sea level from radar and pressure gauge (incorporating atmospheric pressure correction) is ∼2.69 , 2.73, and 1.46 cm at Verem, Tuticorin, and Mandapam, respectively. Harmonic analysis of the two time-series of sea-level data at Verem produces similar residuals and tidal constituents. Our results indicate the importance of concurrent measurement of atmospheric pressure along with subsurface absolute pressure gauge measurements. Internet-based real-/near-real-time tracking and monitoring of sea level, sea state, and surface-meteorological conditions from a network of several island and coastal stations provides considerable information to disaster managers and local administrators during episodic events such as storms, storm surges, and tsunamis.

Paper Details

Date Published: 3 May 2013
PDF: 17 pages
J. Appl. Rem. Sens. 7(1) 073569 doi: 10.1117/1.JRS.7.073569
Published in: Journal of Applied Remote Sensing Volume 7, Issue 1
Show Author Affiliations
Prakash Mehra, National Institute of Oceanography (India)
Ramachandra G. Prabhudesai, National Institute of Oceanography (India)
Antony Joseph, National Institute of Oceanography (India)
Vijay Kumar, National Institute of Oceanography (India)
Yogesh Agarvadekar, National Institute of Oceanography (India)
Ryan Luis, National Institute of Oceanography (India)
Lalsab Nadaf, National Institute of Oceanography (India)

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