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dc.contributor.authorCaitcheon, Gary G
dc.contributor.authorOlley, Jon M
dc.contributor.authorPantus, Francis
dc.contributor.authorHancock, Gary
dc.contributor.authorLeslie, Christopher
dc.date.accessioned2017-05-03T15:39:28Z
dc.date.available2017-05-03T15:39:28Z
dc.date.issued2012
dc.date.modified2012-09-20T22:09:09Z
dc.identifier.issn0169-555X
dc.identifier.doi10.1016/j.geomorph.2012.02.001
dc.identifier.urihttp://hdl.handle.net/10072/46901
dc.description.abstractThe tropics of northern Australia have received relatively little attention with regard to the impact of soil erosion on the many large river systems that are an important part of Australia's water resource, especially given the high potential for erosion when long dry seasons are followed by intense wet season rain. Here we use 137Cs concentrations to determine the erosion processes supplying sediment to two major northern Australian Rivers; the Daly River (Northern Territory), and the Mitchell River (Queensland). We also present data from five sediment samples collected from a 100 km reach of the Cloncurry River, a major tributary of the Flinders River (Queensland). Concentrations of 137Cs in the surface soil and subsurface (channel banks and gully) samples were used to derive 'best fit' probability density functions describing their distributions. These modelled distributions are then used to estimate the relative contribution of these two components to the river sediments. Our results are consistent with channel and gully erosion being the dominant source of sediment, with more than 90% of sediment transported along the main stem of these rivers originating from subsoil. We summarize the findings of similar studies on tropical Australian rivers and conclude that the primary source of sediment delivered to these systems is gully and channel bank erosion. Previously, as a result of catchment scale modelling, sheet-wash and rill erosion was considered to be the major sediment source in these rivers. Identifying the relative importance of sediment sources, as shown in this paper, will provide valuable information for land management planning in the region. This study also reinforces the importance of testing model predictions before they are used to target investment in remedial action.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier
dc.publisher.placeNetherlands
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom188
dc.relation.ispartofpageto195
dc.relation.ispartofjournalGeomorphology
dc.relation.ispartofvolume151-152
dc.rights.retentionY
dc.subject.fieldofresearchEnvironmental Science and Management not elsewhere classified
dc.subject.fieldofresearchGeology
dc.subject.fieldofresearchPhysical Geography and Environmental Geoscience
dc.subject.fieldofresearchcode050299
dc.subject.fieldofresearchcode0403
dc.subject.fieldofresearchcode0406
dc.titleThe dominant erosion processes supplying fine sediment to three major rivers in tropical Australia, the Daly (NT), Mitchell (Qld) and Flinders (Qld) Rivers
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2012
gro.hasfulltextNo Full Text
gro.griffith.authorOlley, Jon M.
gro.griffith.authorPantus, Francis


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