Unusual Weather and River Bank Erosion in the Delta of the Colville River, Alaska

Walker, H. Jesse; Morgan, H.M.

doi:10.14430/arctic3483

Cited by 14 publications

(8 citation statements)

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“…data). The climate is Arctic maritime (Walker and Morgan 1964), with a mean summer temperature of 5 • C and mean summer precipitation of 8 cm (National Oceanic and Atmospheric Administration, unpubl. data).…”

Section: Study Areamentioning

confidence: 99%

Using egg flotation and eggshell evidence to determine age and fate of Arctic shorebird nests

Mabee

Wildman

Johnson

2006

Journal of Field Ornithology

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Egg flotation was used to estimate incubation age and eggshell evidence was collected to determine nest fate at nests of 11 species of shorebirds on the Arctic Coastal Plain of Alaska during 2002–2004. We present egg‐flotation schedules for nine species to facilitate the estimation of nest age. We evaluated the predictive ability of an egg‐flotation schedule for Semipalmated Sandpipers (Calidris pusilla) and were able to estimate incubation age within ∼1–3 d of the assumed age. Patterns of eggshell evidence were similar across species, with eggshell fragments (1–5 mm) present at most successful nests (96%) and eggshell tops or bottoms present only at successful nests. We determined nest fate independently of eggshell evidence and then used discriminant function analysis to predict the probability of correctly classifying a nest's fate using different types of eggshell evidence. The use of eggshell fragment evidence resulted in the correct classification of the fate of all 11 species of shorebirds in 92% of the cases. Both the egg‐flotation technique and eggshell evidence can be used in future studies to calculate accurate measures of reproductive success needed for ecological investigations of shorebirds.

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Section: Study Areamentioning

confidence: 99%

Using egg flotation and eggshell evidence to determine age and fate of Arctic shorebird nests

Mabee

Wildman

Johnson

2006

Journal of Field Ornithology

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“…Along the sides of islands and cutbanks in meandering channels, erosion rates can exceed 0.9 m (3 ft) per year; for instance, erosion at two sites along the Nechelik (Nigliq) Channel averaged 0.9-1.8 m (3-6 ft) per year over a 23-30-year period (Walker, 1983). However, averaging rates over a long period can mask the episodic nature of erosion, in that undercutting of 7.6-9.1 m (25-30 ft) may result from a single storm (Walker and Morgan, 1964). At the main pipeline crossings on the East Channel, erosion of the banks averaged 36.6 cm (1.2 ft) per year.…”

Section: Figure 106 Diagram Of the Evolution Of Soil Stratigraphy Anmentioning

confidence: 99%

“…Thermal erosion of banks occurs during floods and lower flow stages later in the season. Thermal erosion of icerich sediment at and below the water surface leads to the collapse of large blocks, a predominant factor in bank erosion (Walker and Morgan, 1964;Walker and Arnborg, 1966;Ritchie and Walker, 1974). Peat-rich soils tend to have lower erosion rates (0.8 m [2.5 ft] per year) than highly mineralized soils (2.0 m [6.5 ft] per year), presumably because of the protection provided by the fibrous mats of peat (Walker, 1983) and the slower thawing of ice-rich organic matter.…”

Section: Figure 106 Diagram Of the Evolution Of Soil Stratigraphy Anmentioning

confidence: 99%

Coastal region of northern Alaska, Guidebook to permafrost and related features

Jorgenson¹

2011

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“…Church (1988) suggested that large rain events in arctic catchments have the potential to produce sediment yields larger than snowmelt events can. Several studies document significant sediment transport during rain events (Walker and Morgan, 1964;Cook, 1967;Cogley and McCann, 1976;Lewis et al, 2005;McNamara et al, 2008;McNamara et al, 2008). Forbes and Lamoureux (2005), however, described a large summer rain event in Arctic Canada that generated no substantial sediment transport.…”

Section: The Timing Of Effective Eventsmentioning

confidence: 99%

The impact of a shrinking cryosphere on the form of arctic alluvial channels

McNamara

Kane

2008

Hydrological Processes

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Abstract:A shrinking cryosphere has important implications for the geomorphology of alluvial channels in arctic catchments because ice and permafrost alter the driving and resisting forces responsible for shaping local channel cross sections. For example, bedfast ice in shallow channels can suppress bedload transport during snowmelt events causing a reduction in the frequency of geomorphically effective flows, while cap ice in deeper channels can alter stream hydraulics. The impact of these local controls on catchment-scale geomorphic patterns, however, is less certain. A case study of one arctic river in northern Alaska, USA, reveals hydraulic geometry anomalies that can be reasonably explained by the influence of ice and permafrost on local channel form. However, there is a critical lack of data from rivers wholly contained in the continuous permafrost zone preventing comprehensive understanding of how arctic rivers might respond in a shrinking cryosphere.

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Unusual Weather and River Bank Erosion in the Delta of the Colville River, Alaska

Cited by 14 publications

References 0 publications

Using egg flotation and eggshell evidence to determine age and fate of Arctic shorebird nests

Using egg flotation and eggshell evidence to determine age and fate of Arctic shorebird nests

Coastal region of northern Alaska, Guidebook to permafrost and related features

The impact of a shrinking cryosphere on the form of arctic alluvial channels

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