Late Quaternary floodplain reworking and the preservation of alluvial sedimentary archives in unconfined and confined river valleys in the eastern interior of South Africa

Keen‐Zebert, Amanda; Tooth, Stephen; Rodnight, Helena; Duller, G.A.T.; Roberts, Helen M.; Grenfell, Michael

doi:10.1016/j.geomorph.2012.12.004

Cited by 62 publications

(41 citation statements)

References 38 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%

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

Thayer

Ashmore

2016

Geomorphology

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…Further, partly confined (C < 5) settings may tend toward episodic stripping and gradual vertical accretion of the floodplain (Nanson and Croke (1992) type A2) under moderateto high-energy conditions (ω > 40 Wm -2 , Nanson, 1986;Keen-Zebert et al, 2013; A C C E P T E D M A N U S C R I P T…”

Section: Floodplain Accretionary Processes For Partially Alluvial Chamentioning

confidence: 99%

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

Thayer

Ashmore

2016

Geomorphology

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“…Alluvial channel flow is extremely controlled by continuous subsidence and alluvial facies development in the lower and middle course. The channel bank movement largely depends on bank composition and stream power which help to identify whether a channel is avulsed or not (Anderson et al 1996;Keen-Zebert et al 2013). Along with the mentioned factors, coexisting stratigraphic sequences to the channel are very useful evidence to analyse avulsive nature of the channel and new floodplain construction mechanism (Sinha 1996;Sinha and Ghosh 2012).…”

Section: Introductionmentioning

confidence: 99%

Bank vulnerability and avulsion modeling of the Bhagirathi-Hugli river between Ajay and Jalangi confluences in lower Ganga Plain, India

Pal

Biswas

Pramanik

et al. 2016

Model. Earth Syst. Environ.

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The emergence of the study of fluvial dynamics of the alluvial monsoon rivers especially in India is being enriched through the application of remote sensing and GIS techniques. To study fluvial dynamics over time, channel avulsion no doubt is one of the most considerable phenomena. The study section (*75 km) in between the two confluences of the Bhagirathi River i.e., Ajay (Katwa) and Jalangi River (Nabadwip) confluence in Lower Ganga Plain of West Bengal is highly oscillatory in nature. Several satellite images and toposheets of different time periods (1955, 1973, 1990 and 2011) have been used in order to analyse the avulsive nature in this section of the river. These fluvial features (cut offs, ox-bow lakes, point bars etc.) form as a result of channel avulsion and have been identified with the help of Landsat satellite images. The decadal differences in sinuosity ratio in different parts of the studied section, channel migration rate and avulsion model explain the dynamic nature and crucial portions of high bank erosion rate of the channel in the mentioned time period. For both the reaches (R1 and R2), meander loop cut offs are dominant rather than lateral avulsion in the context of aggregate channel migration that also reflects the instability and erosional vulnerability at different meander bends.

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“…Water may remain on the FP even after a flood has receded. The processes, rates, and patterns of FP reworking in the reaches in the LMVs have been defined, and these findings contribute toward understanding the mechanisms by which sediments are deposited, modified, and preserved in rivers (Keen-Zebert et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China

Liu

Yin

et al. 2018

Pet. Sci.

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The Middle Jurassic Shaximiao Formation encompasses tens of meters of thick lowstand meandering valley (LMV) strata in the western Sichuan foreland basin. Ancient LMVs newly discovered in this area were further studied based on sequence stratigraphy and seismic sedimentology. The aim of the present study was to investigate the sedimentary characteristics, sequence architecture, and the controls on LMV deposition in this tectonically active basin using field survey data, seismic sections, seismic amplitude imaging, core description, and comprehensive application of drilling data. The results show the following: (1) Three regional sequence boundaries and two flooding surfaces were recognized, and the Shaximiao Formation was divided into two-third-order sequences and four systems tracts. (2) Three sedimentary facies associations were identified: incised valley-fill, tributary channel, and overbank facies. Incised valleys are 5-17 km wide, 20-60 m deep and traceable for 120 km along their axes. (3) In the downstream segment, the role of tectonism gradually diminishes, and periodic base-level changes control the form and evolution of the incised valleys. Three types of LMVs-A1, A2, and A3-developed with changes in base level (lake level); of these types, the base level of the A3 LMV was likely the lowest.

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Late Quaternary floodplain reworking and the preservation of alluvial sedimentary archives in unconfined and confined river valleys in the eastern interior of South Africa

Cited by 62 publications

References 38 publications

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

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

Bank vulnerability and avulsion modeling of the Bhagirathi-Hugli river between Ajay and Jalangi confluences in lower Ganga Plain, India

Sequence architecture and sedimentary characteristics of a Middle Jurassic incised valley, western Sichuan depression, China

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