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.
Data from the radar and an absolute pressure gauge collected from Verem, Goa over a period of one year- January, 2009
to May, 2010 is used to carry out the comparative studies. The root mean square difference between the estimated sea
level using radar and pressure gauge with atmospheric pressure correction is ~ 2.6 cm. The harmonic analysis over the
two time series produces similar residuals and tidal constituents. The results from the study indicate the importance of
concurrent measurement of atmospheric pressure along with sub-bottom absolute pressure gauge. The radar gauge has
advantages over other type of gauges with regard to easy installation, maintenance and also sea level measurements are
absolute and could be given precedence in future applications.
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