Spatial patterns of scour and fill in dryland sand bed streams

DSpace/Manakin Repository

Open Research Exeter (ORE)

Spatial patterns of scour and fill in dryland sand bed streams

Show simple item record

dc.contributor.author Powell, D. Mark en_GB
dc.contributor.author Brazier, Richard E. en_GB
dc.contributor.author Wainwright, John en_GB
dc.contributor.author Parsons, Anthony en_GB
dc.contributor.author Nichols, Mary en_GB
dc.date.accessioned 2010-04-30T11:55:16Z en_GB
dc.date.accessioned 2011-01-25T10:38:54Z en_US
dc.date.accessioned 2013-03-20T14:29:50Z
dc.date.issued 2006-08 en_GB
dc.description.abstract Spatial patterns of scour and fill in two dryland ephemeral stream channels with sandy bed material have been measured with dense arrays of scour chains. Although the depth and areal extent of bed activity increased with discharge, active bed reworking at particular locations within the reaches resulted in downstream patterns of alternate shallower and deeper areas of scour. The variation was such that mean scour depths for individual cross sections varied about the mean for the reach by a factor of 2–4 while the locus of maximum scour traced a sinuous path about the channel centerline. The wavelength of the pattern of scour was about seven times the channel width. During each event, compensating fill returned the streambeds to preflow elevations, indicating that the streams were in approximate steady state over the period of study. Although the patterns of periodically enhanced scour along alternate sides of the channels are consistent with models of periodically reversing helical flow, further work is required to identify the causal relationships between patterns of flow and sediment transport in dryland sand bed channels. en_GB
dc.identifier.citation Water Resources Research, 2006, 42, W08412 en_GB
dc.identifier.doi 10.1029/2005WR004516 en_GB
dc.identifier.uri http://hdl.handle.net/10036/97753 en_GB
dc.language.iso en en_GB
dc.publisher American Geophysical Union en_GB
dc.relation.url http://www.agu.org/pubs/crossref/2006/2005WR004516.shtml en_GB
dc.subject dryland rivers en_GB
dc.subject sand bed streams en_GB
dc.subject scour and fill en_GB
dc.subject sediment transport en_GB
dc.title Spatial patterns of scour and fill in dryland sand bed streams en_GB
dc.type Article en_GB
dc.date.available 2010-04-30T11:55:16Z en_GB
dc.date.available 2011-01-25T10:38:54Z en_US
dc.date.available 2013-03-20T14:29:50Z
dc.identifier.issn 0043-1397 en_GB
dc.description Reproduced with permission of the publisher. © 2006 American Geophysical Union en_GB
dc.identifier.journal Water Resources Research en_GB


Files in this item

Files Size Format View
Spatial patterns.pdf 3.903Mb PDF Thumbnail

This item appears in the following Collection(s)

Show simple item record

Browse

My Account

Local Links