Windward aeolian slope formation model

Abstract

The model of the formation of windward slope by the air-flow is based on an analysis of the state of a layer composed of noncohesive sand particles. It is assumed that the wind removal of individual particles of this layer leads to a change in its length due to rolling and the immobility of larger particles. The reasons for the alternation of layers of large particles with layers of smaller ones involved in wind-sand transport can be revealed by taking into account deposited saltating particles. The windward slope forms close to the observed ones are obtained under the assumption of a linear dependence of the dynamic velocity on the height of the location on the windward slope. An algorithm for determining the linear coefficient of variation of dynamic velocity is proposed. The calculation of the relative change of the values of the roughness parameter and the scale of the laminar layer at different levels of the windward slope made it possible to estimate the coefficient of surface resistance