Abstract
The combined effect of wind and topography on rain motion and rainfall distribution is analyzed. It is shown that the effect depends on the inclination angle of the raindrops at large heights and on a dimensionless number, P, which describes the ratio of the response distance of falling raindrops to the length-scale of the topography. Two asymptotic solutions are derived, for small and large values of P, and it is proved that the hydrological rainfall intensity per projected unit area over large-scale topographical configurations is uniform. The rain motion and rainfall distributions over low hills for intermediate values of P are calculated numerically. The analysis exhibits the features of the effect and its dependence on the raindrop size, wind field and the scale of the topography.
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