| 中国干旱区不同成因碎屑沉积物的吹蚀速率研究 |
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| 引用本文： | 宋阳,刘连友,李晓燕,WANG Jianhua,TUO Wanquan,LIU Yuzhang.中国干旱区不同成因碎屑沉积物的吹蚀速率研究[J].地理学报(英文版),2006,16(4):495-501. |
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| 作者姓名： | 宋阳 刘连友 李晓燕 WANG Jianhua TUO Wanquan LIU Yuzhang |
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| 作者单位： | 1. 北京师范大学
2. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China |
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| 基金项目： | National Natural Science Foundation of China, No.40471014; The Ministry of Science and Technology, No.2005BA517A-11 |
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| 摘 要： | 1 Introduction The sand deserts in China are the product of long-term wind erosion from clastic sediments and remodified by wind in the arid environments (Wu, 1987; Gao et al., 1993). The origin of aeolian sand is an elementary issue in studying morpholog…
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| 关 键 词： | 沙源 沙漠 风洞实验 吹蚀比率 |
| 收稿时间： | 2006-02-15 |
| 修稿时间： | 2006-02-152006-04-20 |
Deflation rates of different clastic sediments in the arid regions of China |
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| Yang Song,Lianyou Liu,Xiaoyan Li,Jianhua Wang,Wanquan Tuo,Yuzhang Liu.Deflation rates of different clastic sediments in the arid regions of China[J].Journal of Geographical Sciences,2006,16(4):495-501. |
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| Authors: | Yang Song Lianyou Liu Xiaoyan Li Jianhua Wang Wanquan Tuo Yuzhang Liu |
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| Institution: | (1) College of Resources Science and Technology; Key Laboratory of Environmental Change and Natural Disaster, the Ministry of Education of China, Beijing Normal University, Beijing, 100875, China;(2) Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China |
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| Abstract: | By wind tunnel experiment, we studied the deflation rates of 8 different clastic sediments in the arid regions of China, discussed
the sources of aeolian sand and their influence on the development of sand dunes and formation of sand deserts from the view
of dynamics of wind erosion. The average deflation rates of 8 typical clastic sediments in the arid regions of China can be
arranged in the order of lacustrine sand > alluvial sand > weathered sandstone and shale > pluvial sediments > fluvioglacial
sand > weathered granite > slope deposit > glacial sediments. The deflation rates exhibited strong positive correlations with
the erodible particle (0.063–2mm) content and sorting features. In contrast, the deflation rates had obvious negative correlations
with the contents of silt clay (<0.063 mm) and gravel (>2 mm). According to the deflation rates, the 8 typical clastic sediments
can be divided into four categories: (1) lacustrine and alluvial sand, which are readily prone to wind erosion, assumed to
be the main source of aeolian sand; (2) weathered sandstone and shale, pluvial sediments and fluvioglacial sand with considerable
deflation rates, might be the secondary source of aeolian sand; (3) weathered granite and slope deposit having the lower deflation
rates, could supply a little aeolian sand; and (4) glacial sediments with a strong anti-erodibility, could hardly offer any
aeolian sand. In addition to the strong wind conditions, the exposure of extensive lacustrine sand induced by the desiccation
of inland lake basin, as well as the pre-sorting of clastic sediments by flowing water should be the key factors influencing
the development of sand deserts in China. The possible reason the sand deserts in China being mostly distributed around the
inland lake basins and along riverbanks could be better understood through sand source analysis.
Foundation: National Natural Science Foundation of China, No.40471014; The Ministry of Science and Technology, No.2005BA517A-11
Author: Song Yang (1978–), Ph.D., specialized in soil erosion and arid environment. |
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| Keywords: | sand source sand deserts wind tunnel experiment deflation rate sorting features |
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