Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/(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
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ISSN | 0885-6087 |
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 |
推荐引用方式 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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