Abstract
Roughness factor of the facets of a wind-disturbed water surface is defined as the ratio of flatness tolerance to facet length. The mean roughness factor for all facets in the upwind-down-wind direction is about 0.095 at 10 knots wind velocity and about 0.135 at 20 knots when measured by means of a short fetch water-wind tunnel. Using data presented in this paper, approximate calculations have been made on the nature of the function relating radar beam depression angle with the upwind-to-downwind ratio of radar reflection back from the rough sea surface. The results are in qualitative agreement with the meager existing experimental data. It is predicted that there is an interesting minimum in the upwind-to-downwind ratio in the region of 70° depression angle.
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