Radar Scattering from Modulated Wind Waves: Proceedings of the Workshop on Modulation of Short Wind Waves in the Gravity-Capillary Range by Non-Unifor [Paperback]

Ten years ago, de Loor and co-workers at TNO, The Netherlands, were the first to report bottom topography patterns in real aperture radar (RAR) images of the southern North Sea. At that time, this was a real puzzle. The skin depth of microwaves for sea water is only of the order of centimeters while the sea bottom is about 20 meters below the surface. Electromagnetic radiation therefore cannot probe the bottom directly. Similar phenomena were found in radar imagery from SEASAT and SIR-AlB synthetic aperture radars (SAR's) of Nantucket Shoals, the English Channel and many other coastal areas. Since then theory and ocean field experiments (Le., Phelps Bank, Georgia Straits, SARSEX, TOWARD, FASINEX, etc.) have advanced our understanding considerably. We now know that these surface signatures are the results of surface currents, perturbed by the bottom topography, which refract the propagation and modulate the energy of (short) surface waves so as to cause microwave backscatter power variations. Hence, any large scale ocean features containing nonuniform surface currents (i.e. internal waves, eddies, fronts, etc.) will cause similar manifestations in the radar imagery by means of current-wave-microwave interactions. Observations confirm this.Session 1 Tidal Currents and Bathymetry.- Determining the currents over Phelps Bank.- Studies of the sea surface with radar in the Netherlands.- Session 2 Electromagnetic Scattering.- Calculation of microwave Doppler spectra from the ocean surface with a time-dependent composite model.- Limitations of the two-scale theory for microwave backscatter from the ocean.- First results of the VIERS-1 experiment.- Session 3 The Energy Balance in Short Waves.- Effects of reduced surface tension on short waves at low wind speeds in a fresh water lake.- The energy balance in short gravity waves.- Derivation of Phillips a parameter from turbulent diffusion as a damping mechanism.- Temporal and spatial variability of the wind stress vector.- EnerlÝ