Formation events of shoreline sand waves on a gravel beach

Arriaga, Jaime; Falqués, Albert; Ribas, Francesca; Crews, Eddie

doi:10.1007/s10236-018-1157-5

Cited by 5 publications

(11 citation statements)

References 37 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This results in large supplies of shingle accumulating immediately around the point, which in turn is built into ridges overlapping the point by the south-west waves, thus causing the Ness to advance seawards' [2] (p. 3190). Lewis termed the projections on the ness 'salients,' while recent modelling shows that such features can be formed by high-angle waves [24]. The same processes and resulting accretion patterns can be seen occurring today using Lidar data collected in 2017 and 2021 (Figure 9B,C).…”

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 78%

“…By 2021, the northern salient has become reduced, and the southern salient has continued to migrate north (Figure 9C). Topographic survey data from 2010 to 2016 [24] Figure 3) shows that the salients had formed in 2013-2014 in response to high-angle waves [24]. These were incorrectly described as sand waves by [24] because they are primarily composed of gravel, and we prefer the non-genetic term salient following the precedent set by [2].…”

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 99%

“…These were incorrectly described as sand waves by [24] because they are primarily composed of gravel, and we prefer the non-genetic term salient following the precedent set by [2]. It is notable that these features formed during the winter of 2013 when wave modelling by [24] showed a dominance of high-angle waves from the south-west. We suggest that they are formed of sediment eroded from the swash aligned south-west side of Dungeness and deposited at the Ness as the waves refract around the point, creating spits at the apex of the ness that become recurved as the dominant south-west waves are refracted around the ness and then reattached to the shore.…”

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 99%

“…The aims of this paper are to document and interpret the history of beach accretion at Dungeness in four dimensions, length × width (area), × thickness (volume), and time, using a novel combination of historic images, GPR, and Lidar data, quantify rates of sediment accumulation, beach progradation, and assess the impact of 55 years of beach recharge on sediment accumulation downdrift. The Dungeness shoreline is surveyed annually for coastal management, [12,24], but in this study we use freely available remote sensing data and GPR to investigate shoreline morphodynamics and sediment budget on a locally prograding shingle beach.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Four-Dimensional Investigation of Gravel Beach Ridge Accretion and 50 Years of Beach Recharge at Dungeness, UK, Using Historic Images, GPR and Lidar (HIGL)

2021

View full text Add to dashboard Cite

Dungeness is a cuspate foreland on the south coast of England that is the largest shingle feature in Europe and includes hundreds of beach ridges. It is also the location of two nuclear power stations that were constructed in the 1960s. The dominant southwest waves cause longshore drift from west to east, eroding the southwest side of Dungeness, accompanied by accretion on the east side. A record of this eastward movement and sediment accretion is preserved by the shingle beach ridges. The power stations are located on the eroding southwestern side of the ness, and a system of beach recharge has been used to move shingle from the downdrift, east-facing shore to the updrift, southwest-facing shore to protect the power stations from coastal erosion. We use a novel combination of historic images, ground-penetrating radar (GPR), and Lidar (HIGL) to investigate accretion and beach ridges at Dungeness during the past 80 years. We report changes in accretion along the coast and use GPR to determine the thickness of beach gravels. The amount of accretion, represented by the width of the backshore, decreases downdrift from south to north. The number of beach ridges preserved also decreases from south to north. By combining the shingle thickness from GPR with elevation data from Lidar surveys and records of beach accretion measured from aerial images, we estimate the volume and mass of gravel that has accumulated at Dungeness. Historic rates of beach accretion are similar to recent rates, suggesting that the 55 years of beach recharge have had little impact on the longer-term accretion downdrift.

show abstract

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 78%

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 99%

Section: Confirmation Of Lewis's Field Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Four-Dimensional Investigation of Gravel Beach Ridge Accretion and 50 Years of Beach Recharge at Dungeness, UK, Using Historic Images, GPR and Lidar (HIGL)

2021

View full text Add to dashboard Cite

show abstract

“…Lemos et al (2018) use a decadal data set of monthly beach profiles at a macro-tidal beach in France, together with an empirical model to unravel the drivers behind the beach evolution. Arriaga et al (2018) focus on the formation events of shoreline sand waves on gravel beaches. They describe two formation events and they conclude that the undulations are self-organized and that the underlying formation mechanism is the high-angle wave instability.…”

mentioning

confidence: 99%