TIDE AND SURGE DYNAMICS ALONG THE IBERIAN ATLANTIC COAST

The eastern Atlantic barotropic dynamics (in a region spanning from 20 degrees N to 48 degrees N and 34 degrees W to 0 degrees) are studied through numerical modelling and in situ measurements. The main source of data is the tidal gauge network REDMAR, managed by Clima Maritimo ( Puertos del Estado). The numerical model employed is the HAMSOM, devel oped both by the Institut fur Meereskunde (Hamburg University) and Cli ma Maritime. In this paper, tidal and storm surge dynamics are studied for the region, focusing particularly on the nonlinear transfer of en ergy between the different forcings. The results of tidal simulations show good agreement between semidiurnal harmonic components and the va lues obtained from the tidal gauges (both coastal and pelagic) and cur rent metres. The nonlinear transfers of energy from semidiurnal to hig her order harmonics, such as M4 and M6, were mapped. Those transfers w ere found to be important in only two areas: The French continental sh elf in the Bay of Biscay and the widest part of the African shelf, sou th of Cabo Bojador. The modelled diurnal constituents show larger rela tive differences with measurements than semidiurnal harmonics, especia lly in data concerning the phase. A method to isolate the nonlinear tr ansfers of energy between tidal and atmospheric forcing during a storm surge was developed. These transfers were found to be significant in the same areas where tidal nonlinear activity was present. The effect of short period wind generated waves on sea surface elevation was also investigated. The magnitude of the spatial derivatives of radiation s tress was compared with wind-induced stress. As a result of this compa rison, we found the inclusion of a forcing term that depends on radiat ion stress in ocean model simulations at this scale and resolution to be not essential. The effect of computing wind-induced stresses, with a formulation that explicitly depends on sea state, was also explored by means of a coupled run of the HAMSOM and the spectral wave model WA M for a storm surge event in the Spanish coast. This formulation was n ot found to be an improvement over a classical parameterisation which only depends on wind fields. (C) Elsevier, Paris