Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.geomorph.2006.03.011 |
Threshold-dominated fluvial styles in an arid-zone mud-aggregate river: The uplands of Fowlers Creek, Australia | |
Wakelin-King, Gresley A.; Webb, John A. | |
通讯作者 | Wakelin-King, Gresley A. |
来源期刊 | GEOMORPHOLOGY
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ISSN | 0169-555X |
出版年 | 2007 |
卷号 | 85期号:1-2页码:114-127 |
英文摘要 | Fowlers Creek is a mud-aggregate fluvial system. Floodplain muds dominate the river’s deposits and consist of silt, fine to very fine quartzose sand, and clay. Up to similar to 80% of the silts and clays are bound into sand- and silt-sized aggregates and comprise a substantial component (> 42%) of the floodplain muds. Mud-aggregate sediments behave like sands during transport, and as a result, muds can be deposited under conditions of greater flow velocity than would otherwise be the case. Newly deposited floodplain muds are loose and easily entrained, but older floodplain muds are cohesive, and the distribution of modem and older floodplain muds influences erosion patterns across Fowlers Creek. In the lower order streams of the Fowlers Creek uplands, alternate reaches of shallow rectangular channels and unchannelled floodplains collectively form discontinuous ephemeral streams. These landform sequences consist of gullies, coalescing downstream to arroyos, which terminate in distributary intermediate floodouts. At Fowlers Creek, floodouts are preferentially located at tributary junctions, reflecting their origin during very large floods. At floodouts, low slope and high vegetation density promote sheetflow infiltration and landform stability. Their efficiency in retaining runoff make floodouts drought refugia; they are an important ecological element in this and area. The higher order channel of the mid-uplands is a mobile, low-sinuosity, single-thread arroyo, incised into wide muddy unstable floodplains. Fluvial processes are dominated by episodic flood-driven channel avulsion, and variability in stream energy and boundary resistance contributes to a non-equilibrium fluvial style. Frequent reach-scale channel relocation is accompanied by the burial of the abandoned channel in floodplain muds and both erosion and aggradation in downstream floodplains. (c) 2006 Elsevier B.V. All rights reserved. |
英文关键词 | arid environment arroyos ephemeral streams floodplains fluvial sedimentation |
类型 | Article |
语种 | 英语 |
国家 | Australia |
收录类别 | SCI-E |
WOS记录号 | WOS:000251891600009 |
WOS关键词 | BEDLOAD TRANSPORT ; COOPER CREEK ; ANCIENT RIVERS ; DRYLAND RIVERS ; CLASSIFICATION ; FLOODPLAINS ; CHANNELS ; ORIGIN |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/154322 |
作者单位 | La Trobe Univ, Dept Earth Sci, Melbourne, Vic 3086, Australia |
推荐引用方式 GB/T 7714 | Wakelin-King, Gresley A.,Webb, John A.. Threshold-dominated fluvial styles in an arid-zone mud-aggregate river: The uplands of Fowlers Creek, Australia[J],2007,85(1-2):114-127. |
APA | Wakelin-King, Gresley A.,&Webb, John A..(2007).Threshold-dominated fluvial styles in an arid-zone mud-aggregate river: The uplands of Fowlers Creek, Australia.GEOMORPHOLOGY,85(1-2),114-127. |
MLA | Wakelin-King, Gresley A.,et al."Threshold-dominated fluvial styles in an arid-zone mud-aggregate river: The uplands of Fowlers Creek, Australia".GEOMORPHOLOGY 85.1-2(2007):114-127. |
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