Theoretical expressions for soil particle detachment rate due to saltation bombardment in wind erosion

作者：XuYang Liu,WenXiao Ning,ZhenTing Wang

摘要：Saltation bombardment is a dominate dust emission mechanism in wind erosion.For loose surfaces,splash entrainment has been well understood theoretically.However,the mass loss predictions of cohesive soils are generally empirical in most wind erosion models.In this study,the soil particle detachment of a bare,smooth,dry,and uncrusted soil surface caused by saltation bombardment is modeled by means of classical mechanics.It is shown that detachment rate can be analytically expressed in terms of the kinetic energy or mass flux of saltating grains and several common mechanical parameters of soils,including Poisson's ratio,Young's modulus,cohesion and friction angle.The novel expressions can describe dust emission rate from cohesive surfaces and are helpful to quantify the anti-erodibility of soil.It is proposed that the mechanical properties of soils should be appropriately included in physically-based wind erosion models.

发文机构：Key Laboratory of Desert and Desertification University of Chinese Academy of Sciences

关键词：winderosionsaltationbombardmentcohesivesoilanti-erodibility

分类号： O57[理学—粒子物理与原子核物理]