Calculation of thin oil film contrast on waved sea surface

摘要

This paper presents results of modeling of oil film contrast on the sea surface. Modeling consists of two stages: (a) determination of angular dependencies of transmittance and reflectivity of light at oiled seawater surface; (b) determination of upward light flux when wind velocity is changeable, with other parameters fixed. Stage (b) includes phases: (ba) modeling of light flux running perpendicularly upward from clean water (using Monte Carlo method); (bb) similar modeling like in (ba) but with surface covered by oil; at this stage results from stage (a) are utilized; (bc) calculation of contrast of oil smudges based on (ba) and (bb). In relation to (a) this paper shows results of modeling of optical parameters of an oiled seawater surface. Regarding the stage (b), figures show number of photons entering the atmosphere - when sea surface is clean and when it is covered by oil film - as a function of wind speed. When sea surface is relatively calm contrast of oil films becomes lowest (negative). On the contrary, when sea surface is strongly waved, contrast of oil film increases and becomes positive.