Wind Turbulence Effects on Dune Sand Transport
Wind Turbulence Effects on Dune Sand Transport
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DOI：
10.2112/si75-067.1
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发表时间：
2016-08
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影响因子：
--
通讯作者：
K. Udo
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文献类型：
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作者：
K. Udo
摘要Udo，K.，2016.风湍流对沙丘输沙的影响。In：Vila-Concejo，A.;布鲁斯，E.;肯尼迪，D.M.，和McCarroll，R.J.（eds.），第14届国际沿海研讨会论文集（澳大利亚悉尼）。沿海研究杂志，特刊，第75号，页。333-337.椰子溪（佛罗里达），ISSN 0749-0208。本研究通过对海岸沙丘瞬时风速、风向角和风沙通量的野外试验和空间风场的数值模拟，分析了风湍流对风沙输送的影响。实测资料表明，水平湍流强度可用平均水平风速的幂函数方程近似，在各种风况下，水平湍流强度与平均风速呈负相关关系。在不同的风况下，水平湍流强度与风沙通量也呈负相关关系，表明在风沙输送方程中引入湍流强度是可行的。大涡模拟（LES）模式模拟的风场具有合理的风场特征，与地面高程变化的现场测量相一致。然而，结果表明，准确模拟垂直风速和水平和垂直湍流强度是一个很大的挑战相比，模拟水平速度。
ABSTRACT Udo, K., 2016. Wind Turbulence Effects on Dune Sand Transport. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 333–337. Coconut Creek (Florida), ISSN 0749-0208. This study involved field experiment of instantaneous wind velocity, angle, and aeolian sand flux on a coastal dune and numerical simulation of spatial wind fields to analyze the effects of wind turbulence on aeolian sand transport. The field data demonstrate that horizontal turbulence intensity is approximated by a power equation of mean horizontal wind velocity and has a negative relationship with the mean wind velocity in various wind conditions. Horizontal turbulence intensity also has a negative relationship with the aeolian sand flux in various wind conditions, indicating the potential for introducing the turbulence intensity into the aeolian sand transport equation. The wind field simulated with a large eddy simulation (LES) model has reasonable wind characteristics consistent with ground elevation change measured in the field. However, results indicate accurate simulation of vertical wind velocity and both horizontal and vertical turbulence intensity is a great challenge compared to simulation of horizontal velocity.