Dynamics and Numerical Modeling of Sandy Desert Morphology Caused by Aeolian Transport of Sand Particles
Dynamics and Numerical Modeling of Sandy Desert Morphology Caused by Aeolian Transport of Sand Particles
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DOI：
10.4028/www.scientific.net/kem.462-463.1038
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发表时间：
2011-01
期刊：
影响因子：
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通讯作者：
Xamxinur Abdikerem;Mamtimin Gheni;Abdurahman Ablimit;A. Jin
中科院分区：
文献类型：
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作者：
Xamxinur Abdikerem;Mamtimin Gheni;Abdurahman Ablimit;A. Jin
风的作用导致了大量的泥沙通量，使桑迪荒漠化地区既有侵蚀又有堆积，形成了各种美丽的桑迪荒漠地貌。这对沙粒的风成输运的动力学行为的发展确实是至关重要的。沙漠地貌是了解荒漠化问题的重要信息档案。动力学和数值模拟为研究沙粒的风沙运动和沙涟漪、沙丘等沙漠形态提供了必要的工具。本文从动力学的角度，分析了沙粒形态形成过程的几个关键因素，如跃移、蠕动、悬浮、崩落及其阈值条件等，建立了沙粒形态形成过程的数学模型。然后根据风沙流场的真实的特点，分析了水流流场的建立过程，分析了均匀水流流场与风沙流场之间的隐含关系及耦合过程。最后，对风沙流场模型进行离散化处理，分别考虑了固定、半固定和自由风沙流场区沙粒的粒径和质量，模拟了不同类型的桑迪沙漠形态。
Wind caused the much sediment fluxes leading to both erosion and deposits in the sandy desertification area, and the much kind of beautiful sandy desert morphologies are formed. This is really crucial to the development of the dynamic behaviour of aeolian transport of sand particles. The sand desert morphologies are representing significant information archives for understanding the desertification problem. Dynamics and numerical modeling provides an essential tool for studying the aeolian transport of sand particle and morphology of sand desert such as ripple and dune. In this study, the mathematical models based on the dynamics are analyzed by considering the several keys as saltation, creep, suspension, avalanche and its threshold condition etc. for sand morphology forming processes. Then due to sand flow field real characteristics, the establishing process of stream flow field are analyzed, and the implication relationships as well as the coupling process between uniform stream flow field and the sand flow field are analyzed. Finally, the sand flow field models is discretized, and different kinds of sandy desert morphology are simulated by considering the sand particle size and mass in fixed, semi-fixed and free sand flow field area.