Desert dune processes and dynamics

摘要: This article reviews the advances made and problems encountered in measurement, modelling understanding of desert dune dynamics processes last two decades. The main findings three methods investigation are reviewed: field studies, wind tunnel studies mathematical modelling. Whilst major techniques have allowed an appreciation aerodynamic nature sand dunes, particular with research evident measurement aeolian on surfaces. Specifically, it is shown that attempts to ascertain shear stresses windward slopes relate changes stress transport rate erosion/deposition measurements generally failed. These difficulties arisen because non-log-linear velocity profiles surfaces as a result windflow acceleration has calculation surface unviable. Significant been achieved where h...