Fill characteristics of abandoned channels and resulting stratigraphy of a mobile sand‐bed river floodplain

Schwendel, Arved C.; Aalto, R. E.; Nicholas, A. P.; Parsons, D.

doi:10.1002/9781119424437.ch10

Cited by 27 publications

(2 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chute incision can be enhanced in areas of sparse vegetation where roughness is low and roothold is limited (Micheli and Larsen, 2011;Grenfell et al, 2012). In addition, areas of low topography, particularly when aligned across the point bar such as abandoned channels or swales at rivers with scroll bars, provide efficient proto-channels for chutes (Fisk, 1947;Bridge et al, 1986;Mertes et al, 1996;Grenfell et al, 2012;Schwendel et al, 2018;Viero et al, 2018).…”

Section: Chute Incision Processmentioning

confidence: 99%

Meander chute cutoff at an alluvial river facilitated by gypsum sinkholes

Schwendel

Cooper

2021

Geomorphology

View full text Add to dashboard Cite

Section: Chute Incision Processmentioning

confidence: 99%

Meander chute cutoff at an alluvial river facilitated by gypsum sinkholes

Schwendel

Cooper

2021

Geomorphology

View full text Add to dashboard Cite

“…Although they represent a valuable portion of the preserved terrestrial sedimentary record, very few studies have been focused on their architecture and evolution (e.g. Bristow, 1999; Lunt & Bridge, 2004; Bridge, 2006; Ashworth et al ., 2011; Horn et al ., 2012a,b; Toonen et al ., 2012; Schwendel et al ., 2018). Most of the studies on abandoned channels deal with abandonment as a single phase, in addition these studies focused on the abandonment phase of fluvial channels in Quaternary–Recent analogues (Cohen, 2003; Erkens et al ., 2011; Toonen et al ., 2012).…”

Section: Introductionmentioning

confidence: 99%

Evolution of a gradually abandoned Oligocene fluvial palaeovalley fill: Abu‐Roash area, north Western Desert, Egypt

Selim

2021

Sedimentology

View full text Add to dashboard Cite

Little is known about the evolution and gradual abandonment of the fluvial channel and associated sedimentary architecture preserved in the ancient sedimentary rock record. This research aims to analyze the changes and evolution of a gradually abandoned fluvial valley and associated within-channel deposits and architecture from the rock record. This is achieved through detailed photogrammetry, outcrop sedimentology and quantification of palaeochannel parameters for the Oligocene palaeovalley fill of the north Western Desert basin of Egypt. The three-dimensional vertical Oligocene outcrops and trenches of the study area provide the opportunity to analyze sedimentary facies, ichnology, architectural elements and evolution of the gradually abandoned fluvial channel belt. This paper presents a detailed model for the gradual abandonment and evolution of the fluvial palaeovalley through the stepwise transition from braided to meandering channel systems. This includes the transition from a bedload-dominated, low sinuosity, braided channel that prominently features downstream-accreted, mid-channel and compound bars, to a small, mixed and suspended load-dominated intermediate sinuosity (underfit) channel that is characterized by heterolithicdominated point bars, floodplain and mud-plugs via a large, sand-dominated, intermediate sinuosity channel with laterally accreted bars of transitional stage. The gradual abandonment of the fluvial palaeovalley is also associated with a successive decrease of the channel width and depth from >800 to 166 m and from 12 to 5 m, respectively. The successive abandonment is also associated with a gradual increase in the diversity and abundance of Scoyenia-Termitichnus ichnofacies groups, and vice versa in the Skolithos ichnofacies group. The successive decrease in channel width with gradual abandonment of the Oligocene palaeovalley is probably attributed to autogenic gradual avulsion, rather than allogenic. Comparison between the Oligocene palaeovalley fill and the modern analogues indicate the similarities in channel pattern changes and channel dimension through filling stages and differ from most modern counterparts because it is aggradational. This research enhances the understanding of the sedimentological characteristics and stratigraphic architecture of the gradually abandoned fluvial channels in the rock record and introduces insights for prediction of within-channel facies and architectural heterogeneities of the fluvial channel reservoirs.

show abstract

River Dynamics

Rhoads¹

2020

View full text Add to dashboard Cite

Fill characteristics of abandoned channels and resulting stratigraphy of a mobile sand‐bed river floodplain

Cited by 27 publications

References 57 publications

Meander chute cutoff at an alluvial river facilitated by gypsum sinkholes

Meander chute cutoff at an alluvial river facilitated by gypsum sinkholes

Evolution of a gradually abandoned Oligocene fluvial palaeovalley fill: Abu‐Roash area, north Western Desert, Egypt

River Dynamics

Contact Info

Product

Resources

About