Aeolian process-induced hyper-concentrated flow in a desert watershed (SCI)

CORC > 寒区旱区环境与工程研究所 > 中科院寒区旱区环境与工程研究所（未分类） > 期刊论文

	Aeolian process-induced hyper-concentrated flow in a desert watershed (SCI)
	Ta W. Q. ; Wang H. B. ; Jia X. P.
刊名	Journal of Hydrology
	2014
卷号	511 期号:220-228
英文摘要	Ephemeral desert channels are characterized by very high rates of sediment transport during infrequent flood events. Here we show that aeolian process-induced hyper-concentrated (AHC) flows occur in the Sudalaer desert watershed in the Ordos Plateau of China, which primarily transport 0.08-0.25 mm non-cohesive aeolian sand and have a peak suspended sediment concentration of 1.1-1.4 x 10(6) mg l(-3).Aeolian sand supply and storage in the channel play a crucial role in causing hyper-concentrated flow. Our results indicate that non-cohesive aeolian sand can be entrained from the bed and suspended in the turbulent flow when the channel bed slope exceeds a critical threshold (0.0003). We also show that if the frequency ratio of wind-blown sandstorms to rainstorms T-w/T-p exceeds beta(gamma - gamma(0))/alpha (P/V-3) (A/L) (where alpha is the wind-blown sand transport coefficient, beta is the runoff coefficient, gamma - gamma(0) is the increase in suspension concentration caused by addition of aeolian sands, P is the density of rainstorms, V is the wind speed of sandstorms, A is the runoff-generating area, L is the aeolian sand-filled channel length), an AHC flow occurs during the passage of a flood in a desert channel. Since high-frequency aeolian processes provide an adequate quantity of transportable sediment and promote AHC flow, most of the infrequent rainfall-induced floods occurring in arid zones can develop as AHC flows. (C) 2014 Elsevier B.V. All rights reserved.
收录类别	SCI
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://ir.casnw.net/handle/362004/24939]
专题	寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文
推荐引用方式 GB/T 7714	Ta W. Q.,Wang H. B.,Jia X. P.. Aeolian process-induced hyper-concentrated flow in a desert watershed (SCI)[J]. Journal of Hydrology,2014,511(220-228).
APA	Ta W. Q.,Wang H. B.,&Jia X. P..(2014).Aeolian process-induced hyper-concentrated flow in a desert watershed (SCI).Journal of Hydrology,511(220-228).
MLA	Ta W. Q.,et al."Aeolian process-induced hyper-concentrated flow in a desert watershed (SCI)".Journal of Hydrology 511.220-228(2014).