Sea level rise outpaced by vertical dune toe translation on prograding coasts

IJzendoorn, Christa van; Vries, Sierd de; Hallin, Caroline; Hesp, Patrick A.

doi:10.1038/s41598-021-92150-x

Cited by 25 publications

(17 citation statements)

References 42 publications

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“…While there is no clear and simple boundary between the beach and the dune (see Smith, Houser, et al 2020; van IJzendoorn et al 2021), the ensemble average profiles in Figure 7 can be used to approximate the transition where surf processes give way to aeolian processes. Because the ensemble‐averaged profiles are smooth relative to the original profiles, the boundary between the beach and dune is defined as the cross‐shore point that maximize the correlation coefficients for polynomial trendlines extending from the mean water line and the dune crest.…”

Section: Resultsmentioning

confidence: 99%

Textbook dune: Is there a representative and scale‐invariant beach‐dune profile?

Houser

Smith²,

Lunardi³

et al. 2022

Canadian Geographies / Géographies canadiennes

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The Coastal Dune Model, used to examine controls on dune development and evolution, includes negative feedback between the wind and the evolving topography that results in a scale‐invariant beach‐dune profile. While a limited number of reference profiles appear to support the Coastal Dune Model assumption of scale‐invariance, previously published studies and conceptual models suggest that the beach‐dune profile is not scale‐invariant. Using a combination of journal articles, textbooks, and remotely sensed data from Prince Edward Island, Washington state, and Texas, this short communication finds that there is no evidence for a scale‐invariant beach‐dune profile within and between field sites. Variability in the beach‐dune profile is due to site‐specific and scale‐dependent controls on the beach and the dune that are often highlighted in the conceptual models that authors use to depict the controls on sediment supply and transport from the beach to the dune. Results highlight a need to critically evaluate the assumptions and applications of models such as the Coastal Dune Model, and to explore how and when sites can be considered representative and in support of model results.

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Section: Resultsmentioning

confidence: 99%

Textbook dune: Is there a representative and scale‐invariant beach‐dune profile?

Houser

Smith²,

Lunardi³

et al. 2022

Canadian Geographies / Géographies canadiennes

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“…Therefore, if a coastal area expands, a previously conducted accuracy assessment may fail to account for increased errors at the water's edge. Such expansion is common in freshwater environments such as the Great Lakes due to fluctuating water levels, or in marine environments where sediment supply outpaces sea level rise (Quinn, 2002;Hanrahan et al, 2010;van IJzendoorn et al, 2021). In most marine environments however, predicted coastal recession due to global sea level rise (Leatherman et al, 2000;Nicholls and Cazenave, 2010) may decrease the distance from NGCPs to the water's edge, reducing check point errors at the shoreline.…”

Section: Discussionmentioning

confidence: 99%

Using existing infrastructure as ground control points to support citizen science coastal UAS monitoring programs

Rabins

Theuerkauf

Bunting

2023

Front. Environ. Sci.

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Recent publications have described the ability of citizen scientists to conduct unoccupied aerial system (UAS) flights to collect data for coastal management. Ground control points (GCPs) can be collected to georeference these data, however collecting ground control points require expensive surveying equipment not accessible to citizen scientists. Instead, existing infrastructure can be used as naturally occurring ground control points (NGCPs), although availably of naturally occurring ground control point placement on such infrastructure differs from published best practices of ground control point placement. This study therefore evaluates the achievable accuracy of sites georeferenced with naturally occurring ground control points through an analysis of 20 diverse coastal sites. At most sites naturally occurring ground control points produced horizontal and vertical root mean square errors (RMSE) less than 0.060 m which are similar to those obtained using traditional ground control points. To support future unoccupied aerial system citizen science coastal monitoring programs, an assessment to determine the optimal naturally occurring ground control point quantity and distribution was conducted for six coastal sites. Results revealed that generally at least seven naturally occurring ground control points collected in the broadest distribution across the site will result in a horizontal and vertical root mean square errors less than 0.030 m and 0.075 m respectively. However, the relationship between these placement characteristics and root mean square errors was poor, indicating that georeferencing accuracy using naturally occurring ground control points cannot be optimized solely through ideal quantity and distribution. The results of these studies highlight the value of naturally occurring ground control points to support unoccupied aerial system citizen science coastal monitoring programs, however they also indicate a need for an initial accuracy assessment of sites surveyed with naturally occurring ground control points at the onset of such programs.

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“…To date, there is little evidence progradation rates are declining in the face of anthropogenic sea level rise, and instead uplift for the Manawat ū coast is predicted to be 2-3 vertical mm yr −1 , though it is unclear whether coastal progradation was factored into this [59]. Nor is it clear how dunes might respond [61], perhaps affecting the dynamics of wetlands in novel ways.…”

Section: Coastal Managementmentioning

confidence: 99%

Coastal Dynamics Initiate, Relocate and Terminate Short-Lived Wetlands of Dune Slacks, Manawatū, New Zealand

Lozada

Rapson

2022

Land

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Dunelands are one of the most dynamic environments on Earth, which greatly hinders their conservation and management. In the dune slacks along the Manawatū coast, New Zealand, lies a zone of small, temporary, freshwater wetlands that host early seral communities of rare turf plants. Analysis of historical aerial photos allowed determination of coastline movement, distance of the wetlands from the coast, and wetland movements through time. Study sites were around the coastal settlements of Tangimoana and Foxton Beach, both having major rivers debouching nearby, and Himatangi, amongst stabilising exotic pine plantations. The coastline is prograding (with seaward movement) generally by 0.7–1 m yr−1, but is more variable closer to river mouths, with episodes of movement of up to 15 m yr−1. Wetlands occur 200–400 m behind the strandline, are closer to the coast at Foxton Beach, and furthest away at Himatangi. Wetlands wobble in their position at 5.2 m yr−1 but migrate inland at an average of 2.7 m yr−1. Wetland size appears unrelated to rainfall, but may be related positively to coastal progradation rate, to which wetland movement is negatively related. Near the major rivers, dunes are less stable, and wetlands can be impacted both positively and negatively. Wetland existence and movement is balanced between stability and dynamism on the coast, and management will need to be proactive to maintain environments for early successional turfs.

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Sea level rise outpaced by vertical dune toe translation on prograding coasts

Cited by 25 publications

References 42 publications

Textbook dune: Is there a representative and scale‐invariant beach‐dune profile?

Textbook dune: Is there a representative and scale‐invariant beach‐dune profile?

Using existing infrastructure as ground control points to support citizen science coastal UAS monitoring programs

Coastal Dynamics Initiate, Relocate and Terminate Short-Lived Wetlands of Dune Slacks, Manawatū, New Zealand

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