Arid
DOI10.1002/(SICI)1099-1085(19980330)12:4<543::AID-HYP593>3.0.CO;2-C
Flash-flood and bedload dynamics of desert gravel-bed streams
Reid, I; Laronne, JB; Powell, DM
通讯作者Reid, I
来源期刊HYDROLOGICAL PROCESSES
ISSN0885-6087
出版年1998
卷号12期号:4页码:543-557
英文摘要

Comparatively little is known about the hydrology of desert flash-floods despite the extent of the world’s drylands, There is even less known about their sedimentary behaviour and particularly about the movement of coarse material as bedload. The results of an intense field monitoring programme carried out on an ephemeral gravel-bed stream in the northern Negev Desert are presented. In this semi-arid setting, flow duration analysis indicates that the channel is hydrologically active for 2% of the time, or about seven days per year, and that overbank flow can be expected for only 0.03% of the time - about three hours per year. Multipeaked flood hydrographs are the norm, reflecting many factors including the arrival of separate slugs of discharge from contributing subcatchments, The passage of the initial flood bore is surprisingly slow, but the rising limb of the flood hydrograph is rapid with a median time of rise of 10 minutes, in keeping with expected flash-hood behaviour. Bedload flux is high, averaging 2.67 kg s(-1) m(-1) during the period that the channel carries flow. This gives very high bedload sediment yield despite the infrequent and short duration of flood flows and matches the high yield of suspended sediment. The relationship between bedload flux and boundary shear stress is simple, in contrast with perennial gravel-bed streams, and the exponent of the log-log relationship is 1.52. Of great value is that the behaviour of the Nahal Eshtemoa corroborates a pattern established by the authors previously in a smaller tributary stream. (C) 1998 John Wiley & Sons, Ltd.


英文关键词arid-zone bedload sediment flash-flood gravel-bed stream sediment yield
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000073065200002
WOS关键词SEDIMENT TRANSPORT ; EPHEMERAL STREAM ; LOAD TRANSPORT ; CHANNELS ; ISRAEL ; RIVERS ; CREEK
WOS类目Water Resources
WOS研究方向Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/135876
作者单位(1)Loughborough Univ Technol, Dept Geog, Loughborough LE11 3TU, Leics, England
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GB/T 7714
Reid, I,Laronne, JB,Powell, DM. Flash-flood and bedload dynamics of desert gravel-bed streams[J],1998,12(4):543-557.
APA Reid, I,Laronne, JB,&Powell, DM.(1998).Flash-flood and bedload dynamics of desert gravel-bed streams.HYDROLOGICAL PROCESSES,12(4),543-557.
MLA Reid, I,et al."Flash-flood and bedload dynamics of desert gravel-bed streams".HYDROLOGICAL PROCESSES 12.4(1998):543-557.
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