Longshore sediment transport and coastal erosion at Skallingen, Denmark

Aagaard, Troels; Nielsen, Jørgen G.; Jensen, Stine G.; Friderichsen, Julie

doi:10.1080/00167223.2004.10649499

Cited by 29 publications

(28 citation statements)

References 5 publications

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“…6 and 7). The lack of (major) dune fields on the northern part of the peninsula is probably related to the chronic erosion on this updrift part of the barrier spit (Aagaard et al, 2004b) which feeds the central and southern parts and which continues to be of relatively lower elevation than the remainder of the spit. The nearshore bars to the north are of very low relief (Fig.…”

Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 96%

“…3). This suggests that offshore sediment sources are gradually being depleted and/or that smaller volumes of sand eventually reach the shoreline, probably because the bars are currently starved by increased longshore sediment transport rates and gradients along the barrier (Aagaard et al, 2004b).…”

Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 97%

“…Hence, these merging bars represent a positive supply of sediment to the barrier body. The onshore sediment supply from the landward migrating longshore bars as well as the mean deposition rates on the crest and lee slopes of modern foredunes are on the order of 5-9 m 3 m − 1 year − 1 along the central sections of the shoreline (Aagaard et al, 1998(Aagaard et al, , 2004bChristiansen and Davidson-Arnott, 2004) whereas it is up to 18 m 3 m − 1 year − 1 in the southernmost part immediately north of the groynes (Fig. 3).…”

Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 98%

“…To improve navigation to the important harbour of Esbjerg, sand dredging in the entrance channel cutting across the ebb tidal shoal was initiated in 1895; these operations progressively increased channel depth in Grådyb from about 4 m to a present depth of 10.3 m. The dredging has negatively affected the ebb tidal delta and the wave shadow in the lee of this ebb delta, and it has been the main reason for the large recession of Skalling Ende (Aagaard et al, 2004b). Skalling Ende was initially stabilized by wooden groynes in 1935 (see Fig.…”

Section: Geomorphological Setting and Environmental Conditionsmentioning

confidence: 98%

“…Prior to 1910, hindcasts have suggested that the net longshore drift along the downdrift part of Skallingen was in the order of 70,000 m 3 year − 1 , and directed towards the south but since then it has increased by almost an order of magnitude, to approximately 640,000 m 3 year − 1 because of dredging operations in the inlet and the realignment of the shoreline which has resulted in an increased southerly-directed longshore sediment transport gradient. It is this order-of-magnitude increase in the net annual littoral drift that has led to the current erosion problems on the spit (Aagaard et al, 2004b).…”

Section: Geomorphological Setting and Environmental Conditionsmentioning

confidence: 98%

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Environmental controls on coastal dune formation; Skallingen Spit, Denmark

2007

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Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 96%

Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 97%

Section: Key Environmental Issues Controlling Barrier and Dunefield Dmentioning

confidence: 98%

Section: Geomorphological Setting and Environmental Conditionsmentioning

confidence: 98%

Section: Geomorphological Setting and Environmental Conditionsmentioning

confidence: 98%

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Environmental controls on coastal dune formation; Skallingen Spit, Denmark

2007

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Morphological response of a barrier island system on a catastrophic event: the AD 1634 North Sea storm

Fruergaard

Kroon

2015

Earth Surf Processes Landf

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The AD 1634 North Sea storm is one of the most catastrophic storms along the Wadden Sea coast of Denmark. In this study we show how pre-1634 storm morphology exerted a strong control on the resulting post-storm coastal morphology. Erosional responses associated with the storm were barrier breaching, dune scarping and shoreface erosion and accretionary responses were washover deposition, shoreface healing and barrier-island formation. Local sediment sources appeared to have a particularly strong influence on post-storm coastal evolution and allowed a very rapid formation of a barrier shoal which resulted in several kilometres of coastal progradation. Sediment budgets suggest that formation of the barrier shoal was possible, but the sediment transport rates in the decades after the 1634 storm, must have been two to three times higher than present-day rates. The study demonstrates that catastrophic storms are capable of moving large amounts of sediments over relatively short time-periods and can create barrier shoals, whereas moderate storms mostly rework the shoal or barrier and create more local erosion and/or landward migration. Catastrophic storms substantially influence long-term and large-scale coastal evolution, and storms may positively contribute to the sediment budget and promote coastal progradation in coastal areas with longshore sediment convergence.

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Flow dynamics over a foredune scarp

Piscioneri

Smyth

Hesp

2019

Earth Surf Processes Landf

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The nature of wind flow over a small, 0.6 m high foredune scarp is investigated on the Sir Richard Peninsula, South Australia during a variety of incident wind directions and speeds. The study provides additional supporting evidence that the presence of the scarp and the dune exerts a strong influence on a landwards trending reduction in wind velocity and an increase in turbulence, with the greatest area of turbulence occurring near and at the foredune scarp base. For an incident oblique wind, an alongshore helicoidal flow is formed within a separation region along the scarp basal region. In this region, the coefficient of variation (CV) of wind speed is high and displays significant fluctuations. The flow at the scarp crest is compressed, streamlined and accelerated, turbulence is suppressed, and local jets may occur depending on the incident wind approach angle. Jets are more likely where the incident flow is perpendicular or nearly so. A flow separation region does not develop downwind of the scarp crest where the morphology of the foredune stoss slope downwind of the scarp is more convex (as in this case) rather than relatively flat, and possibly due to the presence of vegetation at the scarp crest. A tentative model of the flow regions developed across a backshore–scarp–foredune region during oblique incident flow is provided. © 2018 John Wiley & Sons, Ltd.

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Longshore sediment transport and coastal erosion at Skallingen, Denmark

Cited by 29 publications

References 5 publications

Environmental controls on coastal dune formation; Skallingen Spit, Denmark

Environmental controls on coastal dune formation; Skallingen Spit, Denmark

Morphological response of a barrier island system on a catastrophic event: the AD 1634 North Sea storm

Flow dynamics over a foredune scarp

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