期刊
JOURNAL OF COASTAL RESEARCH
卷 23, 期 5, 页码 1175-1182出版社
COASTAL EDUCATION & RESEARCH FOUNDATION
DOI: 10.2112/05-0499.1
关键词
wind tunnel; aeolian sand transport; saltation; beach erosion; grass
Wind-tunnel experiments were conducted to investigate the effects of vegetation, in particular beach grass, on blown sand in terms of elevation changes of a mobile sand bed and distributions of mean wind velocity for various vegetation canopies. For flexible vegetation layer displacement amplitude of vegetation leaf sway was also measured. The results indicate that a vegetation canopy with low height, high density, and vegetation flexibility is effective in reducing the sand-transport rate. Within and above a canopy of flexible vegetation, the vibrations of leaves increases the air turbulence, which creates a complex interaction between the mean wind velocity and the air turbulence, and thereby reduces the wind velocity in the vegetation area; consequently, the sand-transport rate decreases.
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