【作者】 王静； 方毅； 郝润梅； 周瑞平； 周丹丹； 海春兴；

【Author】 Wang Jing Fang Yi Hao Runmei Zhou Ruiping Zhou Dandan Hai Chunxing (College of Geographical Science,Inner Mongolia Normal University Hohhot,China 010022)

【机构】 内蒙古师范大学地理科学学院；

【摘要】 受下垫面性质的影响,不同地区沙尘暴天气发生时,地表风沙流结构特征有所不同。本文以位于典型荒漠草原区的内蒙古召河观测站为例,根据2011年4月29-30日沙尘暴当天风速仪和集沙仪所测数据,对不同高度各方向相对含沙量进行了对比分析,并研究了风沙流结构模式变化图,以探讨在沙尘暴特殊的天气环境下风沙流结构特征,研究结果表明:主风向西北风向输沙量与高度之间的关系和指数函数拟合的较好,表明输沙量随着高度的增加而增加,风沙流活动主要以悬移为主;与主风向相对的东南方向输沙量与高度之间的关系和乘幂函数拟合性较强,表明输沙量随着高度增加而减少,风沙流活动主要以跃移为主;其他方向输沙量与高度间与任何函数拟合效果均较差,表明输沙量和高度之间没有明显关系。其中离主风向越近的方向,相对含沙量在大于30-35cm高程范围的值越大。更多还原

【Abstract】 By the influence of the properties of underlying surface,when the sandstorm in the different areas,structure of sand-driving wind near the ground is different.In this paper,we take Zhao He observation station at Inner Mongolia in Desertification grassland for example,according to data that are measured by anemometer and during a sandstorm on April 29-30,2011.we comparative analyze relative sediment concentrations for different height in every direction,and study mode change of structure of sand-driving wind,in order to explore structure features of sand-driving wind near the ground during a sandstorm in desertification grassland.The results showed that the northwest are main direction of the sandstorm that the first-rank curve fitting of structure of sand-driving wind is exponential function that showed sediment discharge increase with height increase.The activities of sand blown by the wind are mainly suspension in prevailing wind direction.In the southeast of opposite of prevailing wind direction,the first-rank curve fitting of structure of sand-driving wind is power function that showed sediment discharge decrease with height increase.The activities of sand blown by the wind are mainly saltation in southeast direction. In anther directions,curve fitting of structure of sand-driving wind is bad effect with any function that showed there are no obvious relationship between sediment discharge and height during a sandstorm,that the nearer directions to the prevailing wind direction,the larger relative sediment concentrations at elevations above30-35cm.更多还原