Show simple item record

dc.contributor.authorHoyle, J
dc.contributor.authorBrooks, A
dc.contributor.authorSpencer, J
dc.date.accessioned2017-05-03T14:17:21Z
dc.date.available2017-05-03T14:17:21Z
dc.date.issued2012
dc.date.modified2014-08-28T05:06:51Z
dc.identifier.issn1535-1459
dc.identifier.doi10.1002/rra.1472
dc.identifier.urihttp://hdl.handle.net/10072/37191
dc.description.abstractMany Australian river ecosystems have been, and continue to be, adversely affected by increased channel dimensions and sediment supplies occurring in the period since European settlement. One of the key aims of river rehabilitation in these rivers is to help reduce sediment yield by preventing ongoing bank erosion and remobilization of instream bed material stores. While various tools have been developed to help identify sediment sources at the catchment scale, this is often at a resolution that is too coarse to be translated directly to on-ground rehabilitation works, as most riverworks programs are designed and implemented at the reach or within-reach scale. This paper provides a method of prioritizing rehabilitation at the within-reach scale by using a high-resolution reach-scale modelling approach to examine the relative entrainment potential of sediment stores. The method has been developed for a 10 km reach of the upper Hunter River, NSW, Australia. Shear stress distribution is examined using the widely available model HEC-RAS, and incorporating a detailed, LiDAR-derived, representation of the in-channel vegetation into a spatially distributed Manning's roughness layer. At the geomorphic unit scale, the results highlight that the elevated 'bench' units, which represent significant stores of sand and silt, are much more vulnerable to remobilization than the lower elevation gravel bar units. At the sub-reach scale (500-2000 m) shear stresses are greatest in the most confined sections. While instream geomorphic heterogeneity has been significantly reduced in these locations, ongoing erosion is limited by bedrock and buried coarse gravel terrace material in the bed and banks. These results highlight the need for targeted rehabilitation strategies that account for within-reach variability in entrainment potential as well as on-the-ground knowledge of sediment supply and geological controls. Copyright # 2010 John Wiley & Sons, Ltd.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent1451012 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherJohn Wiley & Sons Ltd.
dc.publisher.placeUnited Kingdom
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom609
dc.relation.ispartofpageto629
dc.relation.ispartofissue5
dc.relation.ispartofjournalEarth Surface Processes and Landforms
dc.relation.ispartofvolume28
dc.rights.retentionY
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchEnvironmental engineering
dc.subject.fieldofresearchcode3103
dc.subject.fieldofresearchcode4011
dc.titleModelling reach-scale variability in sediment mobility: An approach for within-reach prioritization of river rehabilitation works
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2010 John Wiley & Sons, Ltd. This is the pre-peer reviewed version of the following article: Modelling reach-scale variability in sediment mobility: An approach for within-reach prioritization of river rehabilitation works, Earth Surface Processes and Landforms, Early View (Articles online in advance of print), which has been published in final form at http://dx.doi.org/10.1002/rra.1472
gro.date.issued2012
gro.hasfulltextFull Text
gro.griffith.authorBrooks, Andrew P.


Files in this item

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record