Role of the Foredune in Controlling Barrier Island Response to Sea Level Rise

Houser, Chris; Barrineau, Patrick; Hammond, Brianna; Saari, Brooke; Rentschler, Elizabeth; Trimble, Sarah; Wernette, Phillipe; Weymer, Bradley A.; Young, S

doi:10.1007/978-3-319-68086-6_6

Cited by 20 publications

(16 citation statements)

References 122 publications

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“…They are visible as the broad circles with a high degree of anisotropy at each cuspate headland. This is characteristic of parabolic blowouts, in which the dune ridge, trailing arms and deflation basin that each have different orientations (Hesp, 2002;Jewell et al, 2014;2017;). The strong degree of anisotropy associated with the parabolic blowouts is also visible at 100 m, but the lack of these features at scales >500 m suggests that they are relatively small localized features.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Barrier island transgression through landward migration or shoreline retreat is accomplished during storms capable of overtopping or breaching the dunes washing sediment to the backbarrier shoreline in the form of washover fans and terraces (Houser et al, 2008). For an island to transgress and remain a subaerial landform requires that the island can move landward and remain above sea level, which is in turn dependent on the ability of the dunes to recover following storms and moderate washover and inundation (Houser et al, 2017).…”

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

“…The sediment transferred to the backbarrier through washover plays an important role in determining the morphology of the backbarrier shoreline, and in maintaining island width. It is also possible to have a regular variation in washover and dune heights alongshore in response to edge wave set up or even infragravity resonance (Orford and Carter, 1984) that can be reinforced by subsequent washover or blowout development (Jewell et al, 2014;2017).…”

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

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Short communication: Multi-scale topographic anisotropy patterns on a Barrier Island

2017

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Barrier islands exhibit a range of landforms that reflect the complex and varied combination of coastal and aeolian processes realized over the evolution of the island. A detailed analysis of the topography can be used to describe the evolution of a barrier island and provide insight on how it may be affected by a change in sea level, storm activity and wind exposure patterns. Topographic anisotropy, or the directional dependence of relief of landforms, can be used to determine the relative importance of different processes to island evolution at a range of scales. This short communication describes the use of scale-dependent topographic anisotropy to characterize the structure of Santa Rosa Island in northwest Florida. Scale-dependent topographic relief and asymmetry were assessed from a LiDAR-derived DEM from May 2004, a few months before the island experienced widespread erosion and overwash during Hurricane Ivan. This application demonstrates how anisotropy can be used to identify unique scaledependent structures that can be used to interpret the evolution of this barrier island. Results of this preliminary study further highlight the potential of using topographic anisotropy to controls on barrier island response and recovery to storms as well as island resiliency with sea level rise and storm activity.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

Section: Accepted Manuscript Introductionmentioning

confidence: 99%

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Short communication: Multi-scale topographic anisotropy patterns on a Barrier Island

2017

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“…However, modeled and observed shoreline changes on sandy coastlines still tend to show poor agreement over larger‐spatial (>10 1 km) and longer‐temporal (>10 1 years) scales (e.g., Gutierrez et al, ; French et al, ; Yates & Le Cozannet, ). The number and variety of controls and processes that can affect sandy shoreline change, including sea‐level rise (Ashton & Lorenzo‐Trueba, ; Leatherman et al, ; Moore et al, ; Moore et al, ; Murray & Moore, ; Plant et al, ); anthropogenic modifications (Armstrong & Lazarus, ; Hapke et al, ; Johnson et al, ; Miselis & Lorenzo‐Trueba, ; Rogers et al, ; Smith et al, ); geologic substrate (Cooper et al, ; Hauser et al, ; Lazarus & Murray, ; Moore et al, ; Valvo et al, ), nearshore bathymetry (Browder & McNinch, ; McNinch, ; Schupp et al, ), and regional geography (Cooper et al, ; Plant et al, ); wave climate (Anderson et al, ; Antolinez et al, ; Slott et al, ); and sediment grain size (Dean & Dalrymple, ; Komar, ), makes determining their relative contributions difficult, whether empirically or with numerical modeling. The influence of these factors changes with spatial scale (Lazarus et al, ; List et al, )—and at regional scales, a key but commonly overlooked driver of shoreline change is planform curvature.…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Shoreline Change and Planform Curvature on Wave‐Dominated, Sandy Coasts

et al. 2019

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Low‐lying, wave‐dominated, sandy coastlines can exhibit high rates of shoreline change that may impact coastal infrastructure, habitation, recreation, and economy. Efforts to understand and quantify controls on shoreline change typically examine factors such as sea‐level rise; anthropogenic modifications; geologic substrate, nearshore bathymetry, and regional geography; and sediment grain size. The role of shoreline planform curvature, however, tends to be overlooked. Theoretical and numerical model considerations indicate that incident offshore waves interacting with even subtle shoreline curvature can drive gradients in net alongshore sediment flux that can cause significant erosion or accretion. However, these predictions or assumptions have not often been tested against observations, especially over large spatial and temporal scales. Here, we examined the correlation between shoreline curvature and shoreline change rates for spatially extended segments of the U.S. Atlantic and Gulf Coasts (~1,700 km total). Where shoreline stabilization (nourishment or hard structures) does not dominate the shoreline change signal, we find a significant negative correlation between shoreline curvature and shoreline change rates (i.e., convex‐seaward curvature [promontories] is associated with shoreline erosion, and concave‐seaward curvature [embayments] with accretion) at spatial scales of 1–5 km alongshore and timescales of decades to centuries. This indicates that shoreline changes observed in these reaches can be explained in part by gradients in alongshore sediment flux acting to smooth spatial variations in shoreline curvature. Our results suggest that shoreline curvature should be included as a key variable in modeling and risk assessment of coastal change on wave‐dominated, sandy coastlines.

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“…Storm waves interact with the variable morphology of the nearshore, beach, and dunes to determine how vulnerability varies along a barrier island. To some degree, variations in the nearshore, beach, and dune morphology are influenced by the framework geology (Hapke et al, 2010(Hapke et al, , 2016Houser et al, 2008Houser et al, , 2018aHouser, 2012;Riggs et al, 1995). In this paper, the term "framework geology" is defined as any subsurface variation in geologic structure, where variability in geologic structure can result from variations in sediment type (i.e., sand vs. silt), differences in compaction, or significant changes in the subsurface organic content or mineralogy.…”

Section: Introductionmentioning

confidence: 99%

Directional dependency and coastal framework geology: implications for barrier island resilience

et al. 2018

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Abstract. Barrier island transgression is influenced by the alongshore variation in beach and dune morphology, which determines the amount of sediment moved landward through wash-over. While several studies have demonstrated how variations in dune morphology affect island response to storms, the reasons for that variation and the implications for island management remain unclear. This paper builds on previous research by demonstrating that paleo-channels in the irregular framework geology can have a directional influence on alongshore beach and dune morphology. The influence of relict paleo-channels on beach and dune morphology on Padre Island National Seashore, Texas, was quantified by isolating the long-range dependence (LRD) parameter in autoregressive fractionally integrated moving average (ARFIMA) models, originally developed for stock market economic forecasting. ARFIMA models were fit across ∼250 unique spatial scales and a moving window approach was used to examine how LRD varied with computational scale and location along the island. The resulting LRD matrices were plotted by latitude to place the results in the context of previously identified variations in the framework geology. Results indicate that the LRD is not constant alongshore for all surface morphometrics. Many flares in the LRD plots correlate to relict infilled paleo-channels, indicating that the framework geology has a significant influence on the morphology of Padre Island National Seashore (PAIS). Barrier island surface morphology LRD is strongest at large paleo-channels and decreases to the north. The spatial patterns in LRD surface morphometrics and framework geology variations demonstrate that the influence of paleo-channels can be asymmetric (i.e., affecting beach–dune morphology preferentially in one direction alongshore) where the alongshore sediment transport gradient was unidirectional during island development. The asymmetric influence of framework geology on coastal morphology has long-term implications for coastal management activities because it dictates the long-term behavior of a barrier island. Coastal management projects should first seek to assess the framework geology and understand how it influences coastal processes in order to more effectively balance long-term natural variability with short-term societal pressure.

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Role of the Foredune in Controlling Barrier Island Response to Sea Level Rise

Cited by 20 publications

References 122 publications

Short communication: Multi-scale topographic anisotropy patterns on a Barrier Island

Short communication: Multi-scale topographic anisotropy patterns on a Barrier Island

Correlation Between Shoreline Change and Planform Curvature on Wave‐Dominated, Sandy Coasts

Directional dependency and coastal framework geology: implications for barrier island resilience

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