摘要
通过对锡林郭勒典型草原区平坦草地积雪全覆盖状况下风雪流野外观测,分析了近地表100 cm高度内的风雪流结构。结果表明:风雪流结构表现为移雪强度随距离雪面高度增加而急剧减弱。风雪流活动范围随着2 m处风速增强而逐步增大。风雪流结构函数在低风速条件下(4~7 m·s^(-1))符合对数函数关系衰减,高风速条件下(>8 m·s^(-1))呈幂函数关系衰减;风雪流搬运高度主要集中在近地表20 cm范围内,该高度内移雪量达到总移雪量的80%以上;近地表100 cm高度范围内的平均移雪强度与2 m处风速符合极显著的幂函数关系,关系式为Q=3.378 6×10^(-7)·V^(5.5390)(P<0.001,R^2=0.972 9)。近地表风速的增加,会导致风雪流搬运能力的急剧增强。相关结论可为典型草原区风雪流防治提供理论依据。
In this study,the snow drift structure within 100 cm height above snow surface in a flat typical steppe in Xilingol,Inner Mongolia was researched. The results are as follows：（1） The snow drifting intensity was sharply decreased with the increase of height within 100 cm above snow surface. The extent of snow drift was enlarged with the increase of wind speed. The snow drift structure conformed a logarithm function when wind speed was low（ 4-7 m·s^-1） but a power function when wind speed was high（〉 8 m·s^-1）;（2） Within 100 cm height,more than80% snow grains were drifted within 20 cm height above snow surface;（3） The average snow drift intensity within100 cm height conformed the function of Q = 3. 378 6 × 1010^-7·V^5.5390（ P〈0. 001,R^2= 0. 972 9,where V is the wind speed at 2 m height）. The results of this work could provide a theoretical basis for snow drift prevention in typical steppe.
出处
《干旱区研究》
CSCD
北大核心
2017年第5期1042-1048,共7页
Arid Zone Research
基金
国家自然科学基金项目(41361012)资助
关键词
移雪强度
风雪流结构
近地表风速
典型草原
锡林郭勒
snow drift intensity
snow drift structure
wind speed near ground surface
typical steppe
Xilingol
