塔克尔莫乎尔沙漠抛物线形沙丘的粒度分布模式

doi:10.7522/j.issn.1000-694X.2013.00322

摘要/Abstract

摘要： 对新疆伊犁河谷塔克尔莫乎尔沙漠抛物线形沙丘表层78个风成沙样的粒度分析表明，平均粒径均值为220 μm，平均中值粒径为299 μm，标准偏差平均为1.98，偏度平均为-0.29。纵向分布上，从风蚀洼地到迎风坡下部，风成砂的平均粒径和分选性波动变化明显，沿迎风坡向上平均粒径减小，在脊线附近有较粗粒径的分布带。在沙丘背风坡平均粒径减小、负偏增加、分选性较差。在粒度参数等值线及三维分布方面，风蚀洼地和迎风坡下部呈现沿沙丘轴向交替分布的封闭等值曲线，两侧沙臂粒度参数大小波动变化，沙臂北翼坡脚粒度组成呈现很高的负偏和峰度值，反映在区域风况作用下，抛物线形沙丘本身地形起伏、两侧沙臂灌丛沙堆分布对沙丘表面风沙流运移有影响，风沙流与沙臂斜交在背风坡产生涡流引发较强的沉积作用。

关键词: 抛物线形沙丘, 粒度, 塔克尔莫乎尔沙漠, 伊犁

Abstract: The grain size record of 78 aeolian sand samples collected from the Takermohuer Desert in the Yili River Valley, Xinjiang shows that the average value of mean grain size (M_z) is 220 μm, the average value of median size (M_d) is 299 μm, the average standard deviation is 1.98 and the average skewness is -0.29. The longitudinal distribution of the grain size displays an obvious variation in M_z and sorting features from wind-erosion depression to the bottom of the dune windward slope. The M_z decreases along the windward slope and forms a coarse particle zone in the ridge of dune. While in leeward slope of the dune, the grain size record shows a decreased M_z, a negative skewness and a poor sorting. The 3D contour lines of the grain size parameters present alternating distribution of closed contour curve along the wind-erosion depression and the bottom of windward slope. On both sides of the sand arm, the size parameter is fluctuated; and the grain composition presents negative skewness and cuspate kurtosis on north wing slope of sand arm. As mentioned above, the wind activities, topographic environment of parabolic dune and the scrubs on both sand dune arms exert great influence on the sand flow migration on surface of sand dunes. And the eddy currents in the leeward caused by the skew of the sand flow and sand arms trigger strong sedimentation in the leeward slope.

Key words: parabolic dune, grain-size, Takermohuer Desert, Yili

中图分类号:

P931.3

凌智永, 李志忠, 李廷伟, 靳建辉. 塔克尔莫乎尔沙漠抛物线形沙丘的粒度分布模式[J]. 中国沙漠, 2014, 34(2): 325-331.

Ling Zhiyong, Li Zhizhong, Li Tingwei, Jin Jianhui. Grain Size Distribution Pattern of Parabolic Dune at the Takermohuer Desert in Yili, Xinjiang, China[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(2): 325-331.

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