风成沙纹的波高控制机理  

Controlling mechanism of aeolian-ripple height

作　　者：倪晋仁[1] 罗昊[1] 李振山[1] 

机构地区：[1]北京大学环境工程系水沙科学教育部重点实验室,北京100871

出　　处：《泥沙研究》2004年第3期30-33,共4页Journal of Sediment Research

基　　金：国家自然科学基金资助项目 ( 4 962 5 10 1)

摘　　要：采用数值模拟的方法研究了风成沙纹的波高控制机理 ,并与风洞实验测量结果进行了对比。在数值模拟的蠕移模型中考虑了空气动力控制因子对沙粒蠕移距离的影响。结果表明 ,随着空气动力控制因子数值的增大 ,沙纹波高和波长都先增大后减小 ;在特定的空气动力控制因子数值条件下 ,数值模拟结果可与风洞实验结果相比较 。The control mechanism of aeolian_ripple height was investigated with help of the 2D numerical simulation model. An air dynamic factor k affecting the pace of creep grains was introduced in the model. The results show that wavelengths and heights of ripples firstly increase and then decrease with the increase of the air dynamic factor. With consideration of the factor k, the ripple profiles are apparently improved and closer to the observed ones. Experiments are made in a wind tunnel for verification of the modeling results. For certain k, the simulated and measured ripple height and wavelength agree fairly well.

关 键 词：风成沙纹 数值模拟 波高 风洞实验 

分 类 号：TV142[水利工程—水力学及河流动力学]