Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1144/GSL.SP.2005.251.01.02 |
Flow events on a hyper-arid alluvial fan: Quebrada Tambores, Salar de Atacama, northern Chile | |
Mather, AE; Hartley, A | |
通讯作者 | Mather, AE |
会议名称 | Alluvial Fans Conference 2003 |
会议日期 | JUN, 2003 |
会议地点 | Sorbas, SPAIN |
英文摘要 | The Tanibores alluvial fail is located within the hyper-arid Atacama Desert of northern Chile. We examine evidence of the range of flow processes operative ill this environment from a combination of Pleistocene-Holocene fail deposits and a recent (2001) flood event (16 m(3) s(-1)) in the fail feeder channel and upper alluvial-fan area. The field evidence suggests that peak flows recorded in the older deposits generated extensive sheetflood events dominated by antidune deposition in the upper fan area. These extreme, supercritical flows were generated by floods with sustained high sediment and water discharges and high stream power. Easily erodable alluvial source materials ensured high sediment discharge Could be maintained within flood events. High stream power was ensured is a function of the tectonically exacerbated gradients within the source area. The 2001 event indicates the rapid rheological changes that can occur within an individual flood event, ranging from hyperconcentrated streamflow to mudflow. The flow deposits vary little in maximum clast size either between the varying flood events in the upper fan area, or down the fail gradient. This is due to a limited calibre of sediment being produced front the source area. The study highlights: (I) the range of flow rheologies that call be generated from a hyper-arid catchment both within and between flood events of varying magnitude and the associated difficulties in generating, it reliable stratigraphy from the resultant deposits; (2) the high stream power and sediment discharge associated with major flood events and thus the nature of flood hazard in the catchment and oil the fan; and (3) the limitations of sedinientological information such as maximum clast size as an indicator of peak flow characteristics in ancient deposits. |
来源出版物 | Alluvial Fans: Geomorphology, Sedimentology, Dynamics |
ISSN | 0305-8719 |
出版年 | 2005 |
卷号 | 251 |
页码 | 9-24 |
ISBN | 1-86239-189-0 |
出版者 | GEOLOGICAL SOC PUBLISHING HOUSE |
类型 | Proceedings Paper |
语种 | 英语 |
国家 | England |
收录类别 | CPCI-S |
WOS记录号 | WOS:000236408300002 |
WOS关键词 | LAT 22-DEGREES-24-DEGREES-S ; SEDIMENTARY PROCESSES ; NEGEV DESERT ; DEATH-VALLEY ; ORIGIN ; ISRAEL ; CALIFORNIA ; ALTIPLANO ; ANTIDUNES ; BASINS |
WOS类目 | Geology |
WOS研究方向 | Geology |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/295306 |
作者单位 | (1)Univ Plymouth, Sch Geog, Plymouth PL4 8AA, Devon, England |
推荐引用方式 GB/T 7714 | Mather, AE,Hartley, A. Flow events on a hyper-arid alluvial fan: Quebrada Tambores, Salar de Atacama, northern Chile[C]:GEOLOGICAL SOC PUBLISHING HOUSE,2005:9-24. |
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