Arid
DOI10.1029/2010WR009160
Simplicity and complexity of bed load response during flash floods in a gravel bed ephemeral river: A 10 year field study
Cohen, Hai1; Laronne, Jonathan B.1,2; Reid, Ian1,2
通讯作者Cohen, Hai
来源期刊WATER RESOURCES RESEARCH
ISSN0043-1397
出版年2010
卷号46
英文摘要

A decade of data for the Nahal Eshtemoa, an unarmored, gravel bed, ephemeral river, reveals that bed load flux during rain-fed flash floods is a simple function of channel average boundary shear stress. However, the relation is inadequately described by a power function of the type commonly used in predictive bed load equations, and a linear function gives a much better fit. The success of a linear function is related to the unarmored nature of the bed material, typical of ephemeral gravel bed rivers, and the ready availability of sediment at all levels of transport stage. Bed load response to changing shear stress is largely undifferentiated as flash floods wax or wane. However, while most data conform to a simple relation between bed load and hydraulic stress, some for individual floods or flood segments do not, reflecting variability in sediment supply and texture. Three type behaviors are identified that assist in explaining both the general, simple pattern and the limited scatter of the bed load-shear stress plot. Type 1 provides the majority of the data, giving the general linear relation between bed load flux and boundary shear stress. Type 2 is rare, given the flashy nature of the hydrograph, but represents comparatively steady flows well above the entrainment threshold, during which bed load sheets or the breakup of grain clusters lead to spasmodic changes in bed load flux. Type 3 shows a weak relation between shear stress and bed load flux, representing flow conditions just above the entrainment threshold.


类型Article
语种英语
国家Israel ; England
收录类别SCI-E
WOS记录号WOS:000284711400007
WOS关键词SEDIMENT TRANSPORT ; BEDLOAD TRANSPORT ; SIZE DISTRIBUTION ; GRAIN-SIZE ; ROUGHNESS ELEMENTS ; HIGH-RATES ; STREAMS ; CHANNEL ; DESERT ; ISRAEL
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
来源机构Ben-Gurion University of the Negev
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/166631
作者单位1.Ben Gurion Univ Negev, Dept Geog & Environm Dev, IL-84105 Beer Sheva, Israel;
2.Univ Loughborough, Dept Geog, Loughborough LE11 3TU, Leics, England
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Cohen, Hai,Laronne, Jonathan B.,Reid, Ian. Simplicity and complexity of bed load response during flash floods in a gravel bed ephemeral river: A 10 year field study[J]. Ben-Gurion University of the Negev,2010,46.
APA Cohen, Hai,Laronne, Jonathan B.,&Reid, Ian.(2010).Simplicity and complexity of bed load response during flash floods in a gravel bed ephemeral river: A 10 year field study.WATER RESOURCES RESEARCH,46.
MLA Cohen, Hai,et al."Simplicity and complexity of bed load response during flash floods in a gravel bed ephemeral river: A 10 year field study".WATER RESOURCES RESEARCH 46(2010).
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