Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1029/2010WR009160 |
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
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ISSN | 0043-1397 |
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 |
推荐引用方式 GB/T 7714 | 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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