新月形沙丘形态参数与移动速度的关系

doi:10.7522/j.issn.1000-694X.2019.00032

摘要/Abstract

摘要： 在塔克拉玛干沙漠腹地的新月形沙丘演变监测区，运用华测X90 GNSS接收机获取毫米级高时空分辨率三维坐标数据，利用ArcGIS 10.0和CASS 9.0提取新月形沙丘的15个形态参数和移动速度，利用SPSS 21.0对沙丘移动速度与15个形态参数间的数值相关性进行曲线估计分析。结果表明：以移动方向230°为界，沙丘移动速度与移动方向间存在明显的分段线性函数关系；当移动方向为210°~230°时，沙丘移动速度 > 1.5 m/月，移动较快且与主风向NE的下风向方向一致；当移动方向为230°~320°时，沙丘移动速度 ≤ 1.5 m/月，速度较低。沙丘移动速度与沙丘高度之间存在负线性函数关系，沙丘高度每增大1个单位，速度会相应减小2.263个单位，沙丘高度对移动速度的影响较大。移动速度和沙丘走向间存在正的增长函数关系，与沙丘左、右翼走向均呈正线性相关性。研究结果为明确新月形沙丘移动速度的具体影响因素和完善其计算公式提供支持，并对小尺度风沙地貌演变的精确分析有所裨益。

关键词: 塔克拉玛干沙漠, 新月形沙丘, 三维坐标测量, 形态参数, 曲线估计

Abstract: In the monitoring area of the barchan dune evolution in the hinterland of Taklimakan Desert, we get high temporal resolution three-dimensional coordinate data with a precision of millimeters by using the Huace X90 GNSS receiver. ArcGIS 10.0 and CASS9.0 were used for data analyzing and processing, and the fifteen morphological parameters were extracted, and the moving distance is extracted too. The curve estimation analysis between moving speed and the fifteen morphological parameters was made by SPSS21.0. The results show that there is a significant piecewise linear function relationship between the moving speed and the moving direction with the moving direction 230° as the boundary. When the moving direction is between 210° and 230°, which is consistent with the downwind of prevailing wind NE in survey area, and the moving speed is > 1.5 m/month; when the moving direction is between 230ånd 320°, the moving speed is ≤ 1.5 m/month. There is a negative linear function relationship between the moving speed and the dune height, and the speed will decrease by 2.263 units for every one unit increment of height, and the height has a greater effect on speed. A positive growth function relationship existed between the moving speed and the dune trend, and the positive linear correlation is existed both with left and right wing trend. The research results provide support for defining the specific factors affecting the moving speed of barchan dunes and improving its calculation formulas, and will be helpful for the accurate analysis of small-scale aeolian landform evolution.

Key words: Taklimakan Desert, barchan dune, three-dimensional coordinate measurement, morphological parameters, curve estimation

中图分类号:

P931.3

李爱敏, 韩致文. 新月形沙丘形态参数与移动速度的关系[J]. 中国沙漠, 2020, 40(1): 29-40.

Li Aimin, Han Zhiwen. Relationship between moving speed and morphological parameters of barchan dunes[J]. Journal of Desert Research, 2020, 40(1): 29-40.

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