A gradient or mosaic of patches? The textural charater of inset-floodplain surfaces along a dryland river system

Mark Southwell, Martin Thoms

Research output: Contribution to journalArticle

Abstract

This paper investigated the textural character of surface sediments across a range of inset-flood plain surfaces on the Barwon Darling River, Australia. Surface sediments ranged in size from clay to coarse sand (-1Φ) - <4.75Φ) but varied in composition between different inset-flood plain surfaces. Multivariate entropy analysis detected five sediment classes based on the grain size distributions of individual samples. River channel sediments were present in two of the entropy classes, whereas the different inset-flood plain surfaces were present in four or more of the identified entropy classes. A number of factors may be influencing the spatial distribution of sediment texture across the inset-flood plain surfaces including: (1) decreasing energy gradients with increasing elevation from the channel; (2) variable sediment supply conditions during flow events; and (3) local sediment inputs. The resulting patterns found in the study area demonstrate there to be a mosaic of sediment texture patches rather than a simple gradient of changing sediment texture with increasing distance from the channel
Original languageEnglish
Pages (from-to)487-495
Number of pages9
JournalIAHS Proceedings and Reports
Volume306
Issue number1
Publication statusPublished - 2006
Externally publishedYes

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river system
floodplain
sediment
entropy
texture
mosaic
river channel
grain size
spatial distribution
clay
sand
plain
river
energy

Cite this

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A gradient or mosaic of patches? The textural charater of inset-floodplain surfaces along a dryland river system. / Southwell, Mark; Thoms, Martin.

In: IAHS Proceedings and Reports, Vol. 306, No. 1, 2006, p. 487-495.

Research output: Contribution to journalArticle

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