The effect of sand fencing on the morphology of natural dune systems

Itzkin, Michael; Moore, Laura J.; Ruggiero, Peter; Hacker, Sally D.

doi:10.1016/j.geomorph.2019.106995

Cited by 41 publications

(21 citation statements)

References 42 publications

(60 reference statements)

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“…Therefore, methods based on digital elevation models (DEMs) 28 – 30 and vegetation 14 , 25 were excluded. Applicable methods include those based on profile slope 19 – 23 , 32 , profile volume 24 and profile shape 33 . Among the slope-based methods, which are most commonly used, the second derivative method was selected.…”

Section: Methodsmentioning

confidence: 99%

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

IJzendoorn

Vries

Hallin

et al. 2021

Sci Rep

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Sea level is rising due to climate change and is expected to influence the development and dynamics of coastal dunes. However, the anticipated changes to coastal dunes have not yet been demonstrated using field data. Here, we provide evidence of dune translation that is characterized by a linear increase of the dune toe elevation on the order of 13–15 mm/year during recent decades along the Dutch coast. This rate of increase is a remarkable 7–8 times greater than the measured sea level rise. The observed vertical dune toe translation coincides with seaward movement of the dune toe (i.e., progradation), which shows similarities to prograding coasts in the Holocene both along the Dutch coast and elsewhere. Thus, we suspect that other locations besides the Dutch coast might also show such large ratios between sea level rise and dune toe elevation increase. This phenomenon might significantly influence the expected impact of sea level rise and climate change adaptation measures.

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Section: Methodsmentioning

confidence: 99%

“…Recently, new semi-automated methods have become available that can systematically extract the dune toe position from coastal profiles 28 – 33 . These new methods strive towards providing a generic derivation of a dynamic dune toe.…”

Section: Introductionmentioning

confidence: 99%

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

IJzendoorn

Vries

Hallin

et al. 2021

Sci Rep

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“…In addition to natural controls on dune growth and dune shape, human modifications to the beach and dune system typically involve constructing a new foredune, or fortifying the existing foredune to make it more resistant to erosion (e.g., Elko et al, 2016;Nordstrom et al, 2000;Nordstrom & Jackson, 2013), often through the use of sand fencing (e.g., Anthony et al, 2007;Charbonneau & Wnek, 2016;Jackson & Nordstrom, 2018;Miller et al, 2001). In a study on the geomorphic effects of sand fencing, Itzkin et al (2020) demonstrated that foredunes are lower in 65 elevation in areas where sand fences are constructed but that the dune system is substantially wider than foredunes in areas without sand fences. Other management decisions, such as allowing vehicles to drive on beaches and beach raking, can also bring forth tradeoffs between dune growth and coastal protection (Defeo et al, 2009) .…”

Section: Introductionmentioning

confidence: 99%

“…The fourth configuration ( Figure 2D) represents a dune complex that arises when sand fences are placed on managed shorelines. The fenced profiles consist of the dune profiles in which 130 the Dlow position was aligned (Figure 2A) and the addition of a gaussian curve on the seaward side of the dune to represent a typical fenced dune shape (Itzkin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Dune Aspect Ratio, Beach Width and Storm Characteristics on Dune Erosion for Managed and Unmanaged Beaches

Itzkin

Moore

Ruggiero

et al. 2020

Preprint

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Abstract. Dune height is an important predictor of dune impact during a storm event given that taller dunes have a lower likelihood of being overtopped. However, the temporal dominance of the wave collision regime, wherein significant volume loss (erosion) from the dune will occur through dune retreat without the dune being overtopped, suggests that dune width must also be considered when evaluating the vulnerability of dunes to erosion. We use XBeach, a numerical model that simulates hydrodynamic processes, sediment transport, and morphologic change during a storm, to analyze dune erosion as a function of dune aspect ratio (i.e., dune height versus dune width) for storms of varying intensity and duration. We find that low aspect ratio (low and wide) dunes lose less volume than high aspect ratio (tall and narrow) dunes during longer storms, especially if they are fronted by a narrow beach. During more intense storms, low aspect ratio dunes experience greater erosion as they are more easily overtopped than high aspect ratio dunes. In managed scenarios where sand fences are used to construct a fenced dune seaward of the existing natural dune, we find that the fenced dune effectively prevents the natural dune behind it from experiencing any volume loss until the fenced dune is sufficiently eroded, reducing the magnitude of erosion of the natural dune by up to 50 %. We also find that beach width exerts a significant influence on dune erosion; a wide beach offers the greatest protection from erosion in all circumstances regardless of dune morphology or storm characteristics. These findings suggest that efforts to maintain a wide beach may be effective at protecting coastal communities from dune loss. However, in maintaining wide beaches and dunes, the protection offered in the short-term must be considered against long-term detrimental effects of potentially limiting overwash fluxes, which are critical to maintaining island elevation as sea level rises.

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“…Except in as far as ornamental is considered as a species of useful … [and] no degree of acquaintance with any of the dead languages can surely be placed to the account of use. 62 Although Elissa Itzkin maintained that Bentham was here imposing the criteria of 'usefulness', 63 it is clear that there was nothing peculiarly Benthamite about it. Bentham here was just employing the metaphor available in the educational discourse of his time, which was based on 'ordinary utility'.…”

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confidence: 99%

Utilitarian sensibility and liberal education: the case of London University, 1825–36

Sobri

2019

Hist Res

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This article re‐examines the utilitarian character of London University during its foundational years between 1825 and 1836. Previous historians have evaluated the utilitarian character of the institution in terms of whether or not it was influenced by Jeremy Bentham and his philosophy. This approach, however, overlooks the fact that the contemporary sense of being utilitarian was much richer than, and autonomous from, Benthamite utilitarianism. It was a cultural sensibility rather than a systematic philosophy. The eighteen‐twenties witnessed the rise of this sensibility. The founders of the new university significantly benefited from this atmosphere as they could define their cause and criticize their opponents in its terms.

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The effect of sand fencing on the morphology of natural dune systems

Cited by 41 publications

References 42 publications

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

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

The Influence of Dune Aspect Ratio, Beach Width and Storm Characteristics on Dune Erosion for Managed and Unmanaged Beaches

Utilitarian sensibility and liberal education: the case of London University, 1825–36

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