Riverbank Erosion in the Colville Delta, Alaska

Walker, John L.; Arnborg, Lennart; Peippo, Johan

doi:10.2307/521367

Cited by 21 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distinction between braided and meandering rivers is a function of stream power, bank strength, and grain size. Examples of Arctic delta morphology and deposits have been described by Walker et al (1987) and Hill et al (2001). Present-day anastomosed rivers are not often reported in the literature, but fine examples do exist in periglacial regions (see Figure 1).…”

Section: Morphologymentioning

confidence: 98%

See 1 more Smart Citation

PERMAFROST AND PERIGLACIAL FEATURES | Periglacial Fluvial Sediments and Forms

Huissteden¹,

Vandenberghe²,

Gibbard

et al. 2013

Encyclopedia of Quaternary Science

View full text Add to dashboard Cite

Section: Morphologymentioning

confidence: 98%

“…A classic study by Scott (1978) shows a dual effect. The river water tends to undercut banks by creating thermoerosional niches, which sometimes can penetrate for several meters below overhanging frozen bank material (Walker et al, 1987). This may cause high bank erosion rates (Costard et al, 2003).…”

Section: Permafrostmentioning

confidence: 99%

PERMAFROST AND PERIGLACIAL FEATURES | Periglacial Fluvial Sediments and Forms

Huissteden¹,

Vandenberghe²,

Gibbard

et al. 2013

Encyclopedia of Quaternary Science

View full text Add to dashboard Cite

“…Bank erosion between 1949 and the present has averaged between 0AE5 and 1AE5 m year )1 at different positions in the bend (Table 1). For comparison, bank erosion is 0AE1-4AE0 m year )1 with a mean of 1AE6 m year )1 on the nearby Colville River (Walker et al, 1987). Table 1 shows that the location of maximum erosion in the upstream bend is near the apex of the bend (transects B and C) and that bank erosion rates at all transects in this reach have decreased since 1968.…”

Section: Evolution and Migration Of Channels And Barsmentioning

confidence: 99%

Evolution and deposits of a gravelly braid bar, Sagavanirktok River, Alaska

Lunt¹,

Bridge²

2004

Sedimentology

144

100

View full text Add to dashboard Cite

The evolution, migration and deposits of a gravelly braid bar in the Sagavanirktok River, northern Alaska, are described in unprecedented detail using annual aerial photographs, ground‐penetrating radar (GPR) profiles, trenches and cores. Compound braid bars in the Sagavanirktok River form by chute cut‐off of point bars and by growth of mid‐channel unit bars. Subsequent growth is primarily by accretion of unit bars onto their lateral and downstream margins. The upstream ends of braid bars may be sites of erosion or unit bar deposition. Compound braid bar deposits vary in thickness laterally and are thickest in medial sections and near cut banks. Compound bar deposits are typically composed of three to seven sets of simple large‐scale inclined strata, each simple set formed by a unit bar. The simple large‐scale strata contain medium‐scale cross‐strata (from dune migration) and planar strata (from migration of bedload sheets). The upstream and medial parts of compound braid bar deposits show very little vertical variation in grain size, but downstream and lateral margins tend to fine upwards. The deposits are mostly poorly sorted sands and gravels, although sands tend to be deposited at the top of the braid bar, and open‐framework gravels preferentially occur near the top and base of the braid bar. The patterns of braid bar growth and migration, and the nature of the deposits, described from the Sagavanirktok River are generally similar to other sandy and gravelly braided rivers, and consistent with the theoretical braid bar model of Bridge (1993).

show abstract

“…At regional to global scales, carbon and nitrogen released from frozen substrates may substantially contribute to atmospheric concentrations of CH 4 , CO 2 , and N 2 O, with impacts to global biogeochemistry and climate [ Desyatkin et al ., ; Gooseff et al ., ; Grosse et al ., ; Schuur et al ., ; Tarnocai et al ., ; Walter , ; Walter et al ., ]. Locally, liberation of previously frozen substrates, organic materials, and nutrients alters the ecology of receiving streams [ Bowden et al ., 2008; Frey and McClelland , ; Gooseff et al ., ; Rozell , ], impacts sediment loads of streams and rivers [ Gooseff et al ., ; Walker and Hudson , ; Walker et al ., ], and causes ecological and hydrobiogeochemical impacts in lake ecosystems [ Kokelj et al ., 2009a; Mesquita et al ., ; Thompson et al ., ]. Vegetation within and adjacent to retrogressive thaw slump scars are also directly impacted through disturbance and succession on altered surfaces [ Lantz and Kokelj , ; Lantz et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA

Balser

Jones

Gens

2014

J. Geophys. Res. Earth Surf.

View full text Add to dashboard Cite

In the North American low arctic, increased retrogressive thaw slump frequency and headwall retreat rates have been linked with climate warming trends since the midtwentieth century, but specific weather drivers of slump initiation timing are less clear. We examined relationships among retrogressive thaw slump initiation and annual air temperature, precipitation, and snow cover using time series of satellite imagery and weather station data in northwest Alaska. Synthetic aperture RADAR and optical imagery were used to examine retrogressive thaw slump initiation between 1997 and 2010. Over 80% of the slump features examined in this study first appear within a 13 month span from late

show abstract

Riverbank Erosion in the Colville Delta, Alaska

Cited by 21 publications

References 0 publications

PERMAFROST AND PERIGLACIAL FEATURES | Periglacial Fluvial Sediments and Forms

PERMAFROST AND PERIGLACIAL FEATURES | Periglacial Fluvial Sediments and Forms

Evolution and deposits of a gravelly braid bar, Sagavanirktok River, Alaska

Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA

Contact Info

Product

Resources

About