气候变化领域集成服务门户(CCPortal): Field investigation of the fetch effect and essential conditions for saturated sand flow

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DOI	10.1002/esp.5378
	Field investigation of the fetch effect and essential conditions for saturated sand flow
	Zhang, Chunlai; Wang, Xuesong; Zou, Xueyong; Shen, Yaping; Wang, Rende; Wang, Hongtao
通讯作者	Wang, XS (通讯作者)，Beijing Normal Univ, Fac Geog Sci, MOE Engn Res Ctr Desertificat & Blown Sand Contro, State Key Lab Earth Surface Proc & Resource Ecol, 19 Xinjiekouwai Street, Beijing 100875, Peoples R China.
发表日期	2020
ISSN	0197-9337
EISSN	1096-9837
英文摘要	Several models of classical aeolian sand transport mechanism have been developed to predict the rate of sand transport. However, the values predicted through modeling almost always display large and significant differences from the measured values. The reason for such discrepancies is not fully understood. By studying the effects of wind velocities and fetch lengths on the C values in the model proposed by Lettau and Lettau in 1978, we found that the saturation level of the measured sand flow can significantly affect the accuracy of the predicted value. To solve this problem, we introduced an index (delta) to represent the saturation level. The closer the delta value is to 1, the greater the chance that the sand flow is saturated. This new approach only requires measurement of the saturated sand flow data to verify the robustness of the aeolian sand transport model, a step that has been neglected by previous researchers. Our results suggest that the value of C = 6.7 proposed in the Lettau and Lettau model is sound and reliable if the sand flow is saturated. We proposed the conditions required for the sand flow to reach saturation and generated an equation to predict the sand transport saturation length (L-sat). Accordingly, we estimated L-sat to be approximately 92 m when u(*) = 0.47 ms(-1) for the studied sand surface, which is also the minimum wind shear velocity at which the sand flow can potentially reach saturation.
关键词	AEOLIAN SEDIMENT TRANSPORT WIND EROSION MODEL DESERT SPEED
英文关键词	degree of sand transport; fetch effect; field experiment; sand transport; saturation
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000784129100001
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254999
作者单位	[Zhang, Chunlai; Wang, Xuesong; Zou, Xueyong] Beijing Normal Univ, Fac Geog Sci, MOE Engn Res Ctr Desertificat & Blown Sand Contro, State Key Lab Earth Surface Proc & Resource Ecol, 19 Xinjiekouwai Street, Beijing 100875, Peoples R China; [Wang, Xuesong] Beijing Normal Univ, Sch Environm, Beijing, Peoples R China; [Shen, Yaping] Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu, Sichuan, Peoples R China; [Wang, Rende] Hebei Acad Sci, Inst Geog Sci, Hebei Engn Res Ctr Geog Informat Applicat, Shijiazhuang, Hebei, Peoples R China; [Wang, Hongtao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Chunlai,Wang, Xuesong,Zou, Xueyong,et al. Field investigation of the fetch effect and essential conditions for saturated sand flow[J]. 中国科学院西北生态环境资源研究院,2020.
APA	Zhang, Chunlai,Wang, Xuesong,Zou, Xueyong,Shen, Yaping,Wang, Rende,&Wang, Hongtao.(2020).Field investigation of the fetch effect and essential conditions for saturated sand flow.EARTH SURFACE PROCESSES AND LANDFORMS.
MLA	Zhang, Chunlai,et al."Field investigation of the fetch effect and essential conditions for saturated sand flow".EARTH SURFACE PROCESSES AND LANDFORMS (2020).