Hyper-concentrated flow response to aeolian and fluvial interactions from a desert watershed upstream of the Yellow River

doi:10.1016/j.catena.2016.07.033

	Hyper-concentrated flow response to aeolian and fluvial interactions from a desert watershed upstream of the Yellow River
	Wang, Zhijun 1,2,3; Ta, Wanquan 1
刊名	CATENA
	2016-12
卷号	147 页码:258-268
关键词	Aeolian and fluvial interactions Aeolian process Arid zone Desert watershed Hyper-concentrated flow
ISSN号	0341-8162
DOI	10.1016/j.catena.2016.07.033
英文摘要	Aeolian and fluvial interactions (AFIs) are critical earth-surface processes in arid zones, especially in desert watersheds. The response of hyper-concentrated flows to seasonal alternate AFIs shows very high rates of sediment transport and has important environmental and ecological consequences from local to global scales. Here, we present the aeolian processes-induced hyper-concentrated (AHC) flows that occurred in the Sudalaer desert watershed upstream of the Yellow River, which primarily transport non-cohesive coarse aeolian sand (>0.08 mm) and show a peak suspended sediment concentration (SSC) of 1.1 to 1.4 x 10(6) mg l(-3). Our field study and theoretical analysis indicate that non-cohesive coarse aeolian sand downstream in the channel can be entrained from the bed and can be suspended in the turbulent flow by the significant runoff generated upstream with a SSC yo value of 0.5 x 10(6) mg l(-3). Severe aeolian processes can provide an abundant coarse sediment supply in the channel, which, once entrained, can also trigger and promote the development of AHC flows. We define, for the first time, the ratio of the weight percentage of coarse sediment to fine sediment C>(0.08) (mm)/C-<0.05 (mm) as the optimal grain size indicator (OGI) in suspended sediment, indicating that, as the fraction of coarse sediment increases; the significant runoff gradually changes to hyper-concentrated flows and reaches the peak SSC when OGI = 3.25. Due to-the high frequency of sandstorms and the infrequency of rainstorms, most of the significant rainfall -induced runoff with a certain SSC gamma(0) can develop into AHC flows and can substantially contribute to the total sediment yield, even leading to deleterious effects on the downstream river system and ecology. Compared with other desert watersheds in semiarid regions, we propose that a SSC gamma(0) of 500 kg m(-3) is the threshold criteria for the occurrence of AHC flows in the arid desert watersheds. Comprehensive governing of soil erosion in the upstream gully-dissected slopes is an essential and effective measure for controlling AHC flows. (C) 2016 Elsevier B.V. All rights reserved.
资助项目	West Light Talents Foundation of CAS[29Y329971]
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000385598800026
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/33532]
专题	能源与动力工程学院
通讯作者	Wang, Zhijun
作者单位	1.Chinese Acad Sci, Key Lab Desert & Desertificat, Cold & Arid Reg Environm & Engn Res Inst, 260 Donggang West Rd, Lanzhou, Gansu, Peoples R China 2.Lanzhou Univ Technol, Sch Energy & Power Engn, 287 Langongping Rd, Lanzhou, Gansu, Peoples R China 3.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Zhijun,Ta, Wanquan. Hyper-concentrated flow response to aeolian and fluvial interactions from a desert watershed upstream of the Yellow River[J]. CATENA,2016,147:258-268.
APA	Wang, Zhijun,&Ta, Wanquan.(2016).Hyper-concentrated flow response to aeolian and fluvial interactions from a desert watershed upstream of the Yellow River.CATENA,147,258-268.
MLA	Wang, Zhijun,et al."Hyper-concentrated flow response to aeolian and fluvial interactions from a desert watershed upstream of the Yellow River".CATENA 147(2016):258-268.