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Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT (GEBCO, http://www.gebco.net). The bathymetric portion was generated by combining quality-controlled ship depth soundings, with predicted depths between the sounding points guided by satellite-derived gravity data [Smith and Sandwell, 1997]. More than 60 years of historical wind-generated offshore waves were performed for the last half century. The wave hindcast outcomes provide hourly time series of significant wave height, mean wave period, peak frequency and mean wave direction for all the grid points of the computed grid. More details can be found in Reguero et al. 2012. 2.3. THE CORRECTION PROCEDURE OF THE GOW GRID-POINT. In order to reduce possible discrepancies of numerical results with respect to the instrumental data, a correction procedure using satellite info has been applied to the GOW significant wave height. The discrepancies could be due to flaws in the wind fields, insufficient model resolution, unresolved island blocking, imperfect bathymetries, etc. The applied calibration technique is a parametric method based on a nonlinear regression problem. Briefly, the correction parameters vary smoothly along the possible directions by means of cubic splines, allowing different corrections depending on the direction. Corrections are made on empirical quantile information on a Gumbel probability paper scale giving more relevance on the calibration procedure to the maximum data, which is more important from the design point of view. A detailed description of the methodology can be found in Minguez et al., 2011. 2.4. THE GOT (GLOBAL OCEAN TIDES) DATABASE. GOT dataset provide hourly time series of astronomical tide for a selected period. It is generated using the harmonic constants derived from the TPXO7.0 global tides model developed by Oregon State University (http://volkov.oce.orst.edu/tides/global.html). TPXO7.0 is a current version of a global model of ocean tides, which best-fits, in a least squares sense, the Laplace Tidal Equations and along track averaged data from TOPEX/Poseidon and Jason (on TOPEX/POSEIDON tracks, since 2002). The methods used to compute the model are described by Egbert et al. (1994) and further detail is provided by Egbert and Erofeeva (2002). The database includes eight primary constants (M2, S2, N2, K2, K1, O1, P1, Q1), two long period constituents (Mf, Mm), and 3 nonlinear (M4, MS4, MN4) harmonic constituents, provided in a global grid of 1440 x 721 points, at 1/4 degree resolution full global grid. This information is used to reconstruct hourly time series of tide in any location worldwide using the tool t_tide (Pawlowicz et al., 2002). 3. REANALYSIS DATABASES This information has been extracted from two locations points with hourly temporal resolution: • Southwest India [Lon=76.50ºE, Lat=8.00ºN] • Southeast India [Lon=78.00ºE, Lat=8.00ºN] The databases contain met-ocean information with hourly time series of several parameters of the sea state, wind speed and wind direction and sea level variability due to tide: CP1832-FR-AX-02-CP-WaveClimate-Ed1.docx AX02 - 3 www.tamilri.com
Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT • Hs: Significant wave height (metres). Calibrated directionally using satellite data. • Tm: Mean wave period (seconds). • Fp: Peak frequency (Hz). Calculated from the one-dimensional frequency spectrum using parabolic fit around the discrete Peak. • θHs: Mean wave direction (degr., meteorological convention). • W: wind speed at 10 metres above the sea surface (m/s) • Wdir: Wind direction at 10 metres above the sea surface (degr., meteorological convention). • Tide: tidal level (m) without meteorological effects /storm surge. The locations are showed in figure 1. Figure 1. Locations points of reanalysis databases CP1832-FR-AX-02-CP-WaveClimate-Ed1.docx AX02 - 4 www.tamilri.com
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