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BibTeX
Sedimentologically significant tributaries: catchment‐scale controls on sediment (dis)connectivity in the Lockyer Valley, SEQ, Australia
Earth surface processes and landforms, 2017-08, Vol.42 (10), p.1493-1504
Lisenby, Peyton E.
Fryirs, Kirstie A.
2017
Details
Autor(en) / Beteiligte
Lisenby, Peyton E.
Fryirs, Kirstie A.
Titel
Sedimentologically significant tributaries: catchment‐scale controls on sediment (dis)connectivity in the Lockyer Valley, SEQ, Australia
Ist Teil von
Earth surface processes and landforms, 2017-08, Vol.42 (10), p.1493-1504
Ort / Verlag
Bognor Regis: Wiley Subscription Services, Inc
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The nature of catchment‐scale sediment (dis)connectivity is the primary influence on sediment delivery to trunk streams and controls the particle size distribution of channel bed sediments. Here, we examine the distribution of major sediment buffers (floodplains, terraces, alluvial fans, trapped tributary fills), barriers (weirs), and effective catchment area (i.e. sediment contributing area) to characterize the potential for coarse sediment (dis)connectivity in 20 tributaries of Lockyer Creek, in the Lockyer Valley, SEQ. We then analyse the distribution of trunk stream sedimentary links to determine how certain tributaries or disconnecting features (buffers and barriers) influence downstream patterns of bed sediment fining along Lockyer Creek. We find that buffering increases downstream in the Lockyer Valley, and that tributary position and shape influence the space available for sediment buffering. Correspondingly, the spatial extent of sediment buffers impacts the distribution of effective catchment area, which influences the sedimentological significance of individual tributaries. Tributary sediment connectivity, the extent of overbank flows (floodwater zones), and weir locations all exert an additional influence on the distribution of sediment links along the trunk stream. These controls are related to the physiographic and climatic setting of the Lockyer Valley, and anthropogenic influences in this system. We conclude that controls on sediment connectivity and bed load sediment characteristics are highly variable between catchments, and that sediment (dis)connectivity merits equal consideration with tributary basin/channel size when determining controls on tributary–trunk stream relationships and channel sediment regime. Copyright © 2017 John Wiley & Sons, Ltd.
Sprache
Englisch
Identifikatoren
ISSN: 0197-9337
eISSN: 1096-9837
DOI: 10.1002/esp.4130
Titel-ID: cdi_proquest_journals_1925515245
Format
–
Schlagworte
Alluvial fans
,
Anthropogenic factors
,
Barriers
,
Bed load
,
buffer
,
Buffers
,
Catchment area
,
Catchment areas
,
Catchment scale
,
Catchments
,
Coastal inlets
,
Connectivity
,
Downstream
,
downstream sediment fining
,
effective catchment area
,
Floodplains
,
Floodwater
,
Human influences
,
Influence
,
Particle size
,
Particle size distribution
,
Rivers
,
Sediment
,
sediment budget
,
Sediment load
,
Sediment transport
,
sedimentary links
,
Sediments
,
Size distribution
,
Spatial analysis
,
Spatial distribution
,
Streams
,
Terraces
,
Tributaries
,
Valleys
,
Weirs
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