| 沙坡头地区新月形沙丘粒度特征 |
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| 引用本文： | 哈斯,王贵勇.沙坡头地区新月形沙丘粒度特征[J].中国沙漠,2001,21(3):271-275. |
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| 作者姓名： | 哈斯 王贵勇 |
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| 作者单位： | 1. 北京师范大学中国沙漠研究中心;中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站
2. 北京师范大学中国沙漠研究中心 |
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| 基金项目： | 国家自然科学基金(40071012);沙坡头开放站基金资助 |
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| 摘 要： | 由腾格里沙漠东南缘沙坡头附近新月形沙丘表面沉积物的系统采集分析结果，发现从北部沙漠主体向黄河南岸，沙丘沙平均粒径变细但分选变差。同时，粒径及分选性在沙丘断面出现两种变化模式，其一是沙漠主体新月形沙丘由两侧坡部向丘顶区域粒径变细分选变好；其二为黄河两岸阶地和湖盆滩地的新月形沙丘丘顶沙粒粗于其它部位但分选仍然最好。根据粒度参数间的相互关系和其它环境条件的分析，对沙丘沙粒度变化的原因及偏度等也作了初步探讨。
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| 关 键 词： | 新月形沙丘 粒径 分选参数 沙坡头 腾格里沙漠 表面沉积物 |
| 文章编号： | 1000-694(2001)03-0271-05 |
| 修稿时间： | 2000年12月15 |
Characteristics of Grain Size over Crescentic Dunes in Shapotou, Shoutheastern
Tengger Desert |
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| HA Si ,,WANG Gui-yong.Characteristics of Grain Size over Crescentic Dunes in Shapotou, Shoutheastern
Tengger Desert[J].Journal of Desert Research,2001,21(3):271-275. |
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| Authors: | HA Si WANG Gui-yong |
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| Institution: | HA Si 1,2,3,WANG Gui-yong 1,2 |
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| Abstract: | The 69 sand samples were collected and analysed from crescentic dunes developed on different geomorphological sub-environment such as banks of Yellow River and ma in part of southeastern Tengger Desert in the vicinity of Shapotou District, Nin gxia. The results show grain size and sorting parameters varies systematically w ith not only position of the dunes but also geomorphologic location of these dun es. The mean grain size decreases and standard deviation increases from the main part of the desert to the southern terrace of Yellow River. It was also found t hat two-distinct patterns of grain size variation across a dune profile as well as other types of dune such as linear dunes in other desert. The first is that crestal zones of the dunes in the main part of Tengger Desert composes of finer and better sorted than both windward and lee flanks. The second, the crest sand is coarser but still better sorted than any other position of dunes in the banks of the Yellow River. According to analysis of the interrelation between grain s ize parameters and other environmental conditions, the mechanics of grain size v ariation and some skewness characteristics of dune sands have been discussed in this paper. |
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| Keywords: | crescentic dune grain size and sorting Shapotou Tengger Desert |
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