策勒绿洲—沙漠过渡带风沙前沿风沙流结构研究

Research on Wind-sand Structure of Foreland of Wind-sand in Oasis-desert Ecotone in Cele Area

通过对2010年5—11月策勒绿洲—沙漠过渡带流沙前沿50 cm高积沙方口和全方位跃移及全方位蠕移、BNSE集沙系统13个阶段积沙数据进行分析,结合大气象站2 m高同步积沙阶段的平均风速进行分析对比,发现策勒流沙前沿方口积沙仪各高度积沙量随高度分布大部分符合对数、指数和多项式函数分布规律,且拟合程度较好,10 cm和30 cm高度范围的积沙量占总输沙量的百分比分别在23.43%～50.40%和64.30%～83.13%,且分别多集中在40%～50%和80%左右。随着每阶段大于起沙风的平均风速的增大或减小,各积沙仪总输沙率也会总体上呈现相应的增大或减小,二者大致呈正相关关系,积沙仪不同高度不同阶段输沙量的变化除了与风速、地形有很大关系外,通过研究发现每次积沙阶段大于10 mm以上的较大的降雨量将会对积沙仪输沙量和风沙流结构产生一定影响。

Through the data analysis of sand deposition system of square mouth on the height of 50 cm and omnidirectional leaping movement and omnidirectional creeping movement and BNSE from May to October in 2010,mean wind velocity in the height of 2 m of weather station was compared with.Most of matching curve obey logarithm and exponential and multinomial distribution rules were obtained based on analysis of the sand transportation with the height,and the matching degree was well.The percentage of the transportation sand in the height of 10 cm and 30 cm accounted for between 23.43% to 50.40% and 64.30% to 83.13% respectively of square sand disposition machine,and concentrated on 40% to 50% and about 80%.Total sand transportation amount of every sand deposition machine increased or decreased with the mean wind speed changed,and showed positive relativity.Heavy rainfall amount influenced the amount of sand transportation and sand flow structure.The amount of rainfall exceeded 10 mm in every phase influenced the sand transportation to a certain extent.