Global Ocean Surge
GOS (Global Ocean Surges) is a dataset of storm surge, the storm surge is the sea level variations generated by the wind speed and low air pressures. GOS encompasses 3 regions: Europe, Arabian Sea and Latin-America (including Caribbean, Atlantic and Pacific areas). The historical reconstruction of storm surge in the south European region (Cid et al. 2014; Abascal et al., 2012) has a spatial resolution of 1/8º (~30km), while the American region has 1/4º (Losada et al., 2013; CEPAL, 2012). The details about the different historical reconstructions of storm surge datasets are shown in the Table 4.1. The dataset provide hourly outputs include the historical storm surge events (Figure 4.2).
Table 4.1. Main characteristics of the ROW datasets available in IH Data, the coordinates of the geographical coverage are aproximated
Figure 4.2. Extreme storm surge event on November 2001 from GOS dataset. Red and blue colors are, respectively, positive and negative values of storm surge.
GOS has been performed using the Regional Ocean Model System (ROMS), developed by Rutgers University (Shchepetkin and McWilliams, 2003, 2005). ROMS is a three-dimensional, free-surface, terrain-following ocean model that solves the Reynolds-averaged Navier-Stokes equations using the hydrostatic vertical momentum balance and Boussinesq approximation.
Surge elevations calculated using the ROMS model were validated with measures from tidal gauges and altimetry data. A good agreement between modelled and measured data was found (figure 4.3), showing the capability of the model to accurately simulate sea level and extreme storm surge events.
Figure 4.3. Annual time series comparison of storm surge from GOS and the Santander tide-gauge (Spain).