Modern depositional processes in a confined, flood-prone setting: Benches on the Shoalhaven River, NSW, Australia

Kermode, Stephanie J; Cohen, Tim J; Reinfelds, Ivars; Jones, Brian G.

doi:10.1016/j.geomorph.2014.09.022

Cited by 4 publications

(2 citation statements)

References 65 publications

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“…5 of these cases has not been clearly documented (Brakenridge, 1984;Nanson, 1986;Tooth et al, 2002Tooth et al, , 2004Tooth et al, , 2007Marren et al, 2006;Cohen and Nanson, 2008;Kermode et al, 2012Kermode et al, , 2015Keen-Zebert et al, 2013). Further, existing classifications of floodplain development in alluvial channels (e.g., Nanson and Croke, 1992) may not necessarily apply to glacially conditioned watersheds (Phillips and Desloges, 2015a) where channels, particularly in mid-watershed and downstream reaches, are often partly confined forming floodplains as narrow, discontinuous surfaces, similar to the partly confined, mixed alluvium-bedrock settings of Fryirs and Brierley (2010).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Floodplain morphology, sedimentology, and development processes of a partially alluvial channel

Thayer

Ashmore

2016

Geomorphology

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Section: Accepted Manuscriptmentioning

confidence: 99%

Floodplain morphology, sedimentology, and development processes of a partially alluvial channel

Thayer

Ashmore

2016

Geomorphology

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“…In these settings, the valley floor was dominated by a single terrace (T1) which occupied up to 90% of the valley floor. Floodplains were comparatively narrow (10-30 m wide) and are commonly referred to as alluvial benches within the Australian literature [40,78,79]. These were inset within the macrochannel and are inundated by 2-5-year annual exceedance probability (AEP) floods.…”

Section: Valley Floor Characteristicsmentioning

confidence: 99%

Climatically-Controlled River Terraces in Eastern Australia

Daley

Cohen

2018

Quaternary

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In the tectonically stable rivers of eastern Australia, changes in response to sediment supply and flow regime are likely driven by both regional climatic (allogenic) factors and intrinsic (autogenic) geomorphic controls. Contentious debate has ensued as to which is the dominant factor in the evolution of valley floors and the formation of late Quaternary terraces preserved along many coastal streams. Preliminary chronostratigraphic data from river terraces along four streams in subtropical Southeast Queensland (SEQ), Australia, indicate regionally synchronous terrace abandonment between 7.5–10.8 ka. All optically stimulated luminescence ages are within 1σ error and yield a mean age of incision at 9.24 ± 0.93 ka. Limited samples of the upper parts of the inset floodplains from three of the four streams yield near-surface ages of 600–500 years. Terrace sediments consist of vertically accreted fine sandy silts to cohesive clays, while top stratum of the floodplains are comprised of clay loams to fine-medium sands. The inundation frequency of these alluvial surfaces depends on their specific valley setting. In narrow valley settings, where floodplains comprise <5% of the valley floor, terraces are inundated between the 20 and 50-year annual exceedance probability (AEP) flood, while in wide settings (floodplains >20%), the terraces are no longer inundated. Floodplain inundation frequencies also vary between these settings by an order of magnitude between 5- to 50-year AEP, respectively. The correlation of terrace abandonment within SEQ with fluvial and palaeoenvironmental records elsewhere in the subtropics, and more broadly across eastern Australia, are an indication that terrace abandonment has primarily been driven by climatic forcing. Contemporaneous channel incision in the early Holocene may have been driven by an increasingly warmer and wetter environment in SEQ, with a climate commensurate with the delivery of more extreme weather events. Following channel incision, many streams in SEQ have been largely confined to their entrenched “macrochannel” form that remains preserved within the valley floor.

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The sediment stratigraphy of a flood event: An example from the Sabie River, South Africa

Knight

Evans

2017

CATENA

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Modern depositional processes in a confined, flood-prone setting: Benches on the Shoalhaven River, NSW, Australia

Cited by 4 publications

References 65 publications

Floodplain morphology, sedimentology, and development processes of a partially alluvial channel

Floodplain morphology, sedimentology, and development processes of a partially alluvial channel

Climatically-Controlled River Terraces in Eastern Australia

The sediment stratigraphy of a flood event: An example from the Sabie River, South Africa

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