关键词: 草原, 风力侵蚀, 植被, 风洞模拟试验

Abstract:

Based on previous studies, selecting desert grasslands in the Ulanqab League of the Inner Mongolia as studied area, we carried out a quantitative analysis on influence of vegetation coverage on wind erosion by simulation test with a field mobile wind tunnel, which aimed at discussing the change of aerodynamic roughness and flow structure features under different vegetation coverage, and the quantitative relationship between vegetation coverage and sediment yield. Results show that aerodynamic roughness increases linearly approximately with the increase of vegetation coverage, and linear functional relationship is Z0=ax3+bx2+cx+d. With the increasing of the height above the ground, sediment yield decreases. With the increase of vegetation coverage, sediment yield at each layer also reduces. Under different wind speeds, the relation between sediment yield of wind erosion and vegetation coverage is related by a power function. The conclusion will provide a theory basis for soil and water loss mechanism research.

Key words: grasslands, wind erosion, vegetation, wind tunnel simulation test