沙丘背风侧气流的变化特征及其意义

doi:10.13249/j.cnki.sgs.2000.06.573

地理科学 ›› 2000, Vol. ›› Issue (6): 573-576.doi: 10.13249/j.cnki.sgs.2000.06.573

• 研究报道 • 上一篇

沙丘背风侧气流的变化特征及其意义

哈斯^1,2, 王贵勇¹

1. 北京师范大学资源科学研究所, 环境演变与自然灾害教育部重点实验室, 北京 100875;
2. 中国科学院沙坡头沙漠试验研究站, 甘肃兰州 730000

收稿日期:2000-04-20 修回日期:2000-10-25 出版日期:2000-11-20 发布日期:2000-11-20
基金资助:
国家自然科学基金项目(40071012, 49501001)和博士后基金资助。

Variation in Dune Lee-Side Airflow and Its Significance

HA Si^1,2, WANG Gui-yong¹

1. Key Laboratory of Environmental Change and Natural Disaster, the Ministry of Education of China, Institute of Resources Science, Beijing Normal University, Beijing 100875;
2. Shapotou Experimental Station of Desert Research, CAS Lanzhou, Gansu 730000

Received:2000-04-20 Revised:2000-10-25 Online:2000-11-20 Published:2000-11-20

摘要/Abstract

摘要： 对腾格里沙漠东南缘格状沙丘主、副梁和新月形沙丘表面气流的野外观测发现分离流、附着未偏向流和附着偏向流等3种背风坡次生气流。前者以弱的反向流为特征,多发生在横向气流条件下,坡度较陡的背风坡上;后二者具有相对高的风速,多发生在坡度缓和的背风坡上,其方向在横向气流条件下保持原来的方向,在斜向气流作用下发生偏转,且其强度为原始风入射角的余弦函数。根据3种次生气流强度、方向等特征,阐述了其相应的风成沉积过程和可能产生的层理类型,并对利用风成交错层理恢复古气流环境中的有关问题作了初步探讨。

Abstract: Data from different types of dunes suggest that the near surface air-flow over dune lee side varied with dune morphology and primary wind direction relative to dune crest-line. It is found that three types of secondary air-flow exist according to their directions and magnitudes, they are: return flow, attached and not deflected flow, and attached and deflected flow. Return flow, characterized by lower velocity, occurred on stepper lee slops in transverse flow conditions; attached flow with higher wind velocity occurred on gentle lee slops. The attached flow could be deflected in the oblique primary wind environment but not deflected in transverse flow conditions, and its magnitude is the cosine function of primary wind direction relative to dunes . According to the nature of three types of secondary flow, the authors expound the corresponding sedimentary processes and possible stratification types, and also discuss the aeolian cross-strata as an indicator of paleowind environment.

中图分类号:

P532

哈斯, 王贵勇. 沙丘背风侧气流的变化特征及其意义[J]. 地理科学, 2000, (6): 573-576.

HA Si, WANG Gui-yong. Variation in Dune Lee-Side Airflow and Its Significance[J]. SCIENTIA GEOGRAPHICA SINICA, 2000, (6): 573-576.

参考文献

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沙丘背风侧气流的变化特征及其意义

Variation in Dune Lee-Side Airflow and Its Significance

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