风成床面形态是跨越多个时间和空间尺度的复杂系统，其形成演化过程与动力机制长期困扰着国际风沙学界。弄清尺度效应是解决这一难题的关键。巴丹吉林沙漠广泛分布高大沙山，是风成床面研究的天然实验室。本项目以该沙漠的典型横向风成床面系统为研究对象，利用几何特征测量、形态-动力学观测、沉积结构探测、年代序列重建、动力学理论分析等手段，研究床面失稳、气流变化、波长选择、沉积模式等基本过程，揭示不同等级风成床面形态形成和相互作用的物理机制，给出尺度效应的定量表达，为建立风成床面系统的多尺度动力学模型奠定实验和理论基础。

As a complex system, aeolian bedform occurs on multiple temporal and spatial scales. Aeolian researchers have been puzzled by its formative and dynamical mechanism for a long time. Scale effect is the key to solve this problem. The Badain Jaran desert having the highest dune on Earth is an ideal natural ``laboratory'' to study such a system. The proposed project will select the typical transverse aeolian bedforms in this desert as subject investigated firstly, perform the field measurement and sampling related with geomorphology, wind-blown sand transport, sedimentological structures, chronology etc. secondly, and make theoretical analysis about the dynamical process finally. The aim of this study is to reveal the physical mechanism of the formation and interaction of different aeolian bedform grades, to obtain the quantitative expression of scale effect, and to provide an experimental and theoretical basis for establishing the multi-scale dynamic model of aeolian bedform.