img

官方微信

高级检索

中国沙漠 ›› 2001, Vol. 21 ›› Issue (3): 271-275.

• 研究论文 • 上一篇    下一篇

沙坡头地区新月形沙丘粒度特征

哈斯1,2,3, 王贵勇1,2   

  1. 1. 北京师范大学中国沙漠研究中心, 北京 100875;
    2. 北京师范大学环境演变与自然灾害教育部重点实验室, 北京 100875;
    3. 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, 甘肃兰州 730000
  • 收稿日期:2000-12-15 修回日期:2001-01-17 出版日期:2001-09-20 发布日期:2001-09-20
  • 作者简介:哈斯(1964-),男(蒙古族),内蒙古科左中旗人,博士,主要从事风沙地貌与环境方面研究工作。
  • 基金资助:
    国家自然科学基金(40071012);沙坡头开放站基金资助

Characteristics of Grain Size over Crescentic Dunes in Shapotou, Shoutheastern Tengger Desert

HA Si1,2,3, WANG Gui-yong1,2   

  1. 1. China Center of Desert Research, Beijing Normal University, Beijing 100875, China;
    2. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education of China, Beijing 100875, China;
    3. Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China
  • Received:2000-12-15 Revised:2001-01-17 Online:2001-09-20 Published:2001-09-20

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。

关键词: 新月形沙丘, 粒径与分选参数, 沙坡头, 腾格里沙漠

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 main part of southeastern Tengger Desert in the vicinity of Shapotou District, Ningxia. The results show grain size and sorting parameters varies systematically with 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 size parameters and other environmental conditions, the mechanics of grain size variation and some skewness characteristics of dune sands have been discussed in this paper.

Key words: crescentic dune, grain size and sorting, Shapotou, Tengger Desert

中图分类号: