Optimal Responses to Shoreline Changes: An Integrated Economic and Geological Model With Application to Curved Coasts

Jin, Di; Ashton, Andrew D.; Hoagland, Porter

doi:10.1111/nrm.12014

Cited by 23 publications

(20 citation statements)

References 30 publications

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“…Instead, we focus 5 on exploring the relative role of tidal and overwash fluxes on the response of barriers to SLR, which requires omitting processes that could also play a significant role. For instance, the BRIE model does not account for human activities and coastal protection strategies along the coast (e.g., sea walls, groins, beach nourishment), which are known to affect coastal response at different spatial and temporal time scales (Brad Murray et al, 2013;Jin et al, 2013). Rather than accounting for marsh-lagoon dynamics in the backbarrier environment, which can potentially influence the rate of barrier landward 10 migration under sea-level rise (FitzGerald et al, 2008;Lorenzo-Trueba and Mariotti, 2017), we define a fine sediment thickness based on the lagoon depth and the basement slope.…”

Section: Discussionmentioning

confidence: 99%

Simulating barrier island response to sea-level rise with the barrier island and inlet environment (BRIE) model v1.0

Nienhuis¹,

Lorenzo‐Trueba²

2019

Preprint

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Abstract. Barrier islands are low-lying coastal landforms vulnerable to inundation and erosion by sea-level rise. Despite their socio-economic and ecological importance, their morphodynamic response to sea-level rise or other hazards is poorly understood. To tackle this knowledge gap, we outline and describe the BarrieR Inlet Environment (BRIE) model that can simulate long-term barrier morphodynamics. In addition to existing overwash and shoreface formulations, BRIE accounts for alongshore sediment transport, inlet dynamics, and flood-tidal delta deposition along barrier islands. Inlets within BRIE can open, close, migrate, merge with other inlets, and build flood-tidal delta deposits. Long-term simulations reveal complex emergent behaviour of tidal inlets resulting from interactions with sea-level rise, and overwash. BRIE also includes a stratigraphic module, which demonstrates that barrier dynamics under constant sea-level rise rates can result in stratigraphic profiles composed of inlet fill, flood-tidal delta and overwash deposits. In general, the BRIE model represents a process-based exploratory view of barrier island morphodynamics that can be used to investigate long-term risks of flooding and erosion in barrier environments. For example, BRIE can simulate barrier island drowning in cases where the imposed sea-level rise rate is faster than the morphodynamic response of the barrier island.

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Section: Discussionmentioning

confidence: 99%

Simulating barrier island response to sea-level rise with the barrier island and inlet environment (BRIE) model v1.0

Nienhuis¹,

Lorenzo‐Trueba²

2019

Preprint

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“…With the presence of coastal communities, human responses to coastal change provide additional feedbacks to coastal environments, suggesting the possibility of emergent interactions at multidecadal time scales (Jin et al, ; Lazarus et al, ; Miselis & Lorenzo‐Trueba, ; Werner & McNamara, ). Human responses intended to preserve coastal buildings and infrastructure—such as building seawalls, constructing groynes, nourishing beaches, stabilizing inlets, or armoring updrift headlands—have accumulated to the point where the evolution of coastal landscapes cannot be considered to be caused by nature alone (Hapke et al, ; Lazarus & Goldstein, ; Lazarus et al, ; Nordstrom, ; Werner & McNamara, ).…”

Section: Coastal Flooding In a Dynamic Physical Environmentmentioning

confidence: 99%

Usable Science for Managing the Risks of Sea‐Level Rise

et al. 2019

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Sea-level rise sits at the frontier of usable climate climate change research, because it involves natural and human systems with long lags, irreversible losses, and deep uncertainty. For example, many of the measures to adapt to sea-level rise involve infrastructure and land-use decisions, which can have multigenerational lifetimes and will further influence responses in both natural and human systems. Thus, sea-level science has increasingly grappled with the implications of (1) deep uncertainty in future climate system projections, particularly of human emissions and ice sheet dynamics; (2) the overlay of slow trends and high-frequency variability (e.g., tides and storms) that give rise to many of the most relevant impacts; (3) the effects of changing sea level on the physical exposure and vulnerability of ecological and socioeconomic systems; and (4) the challenges of engaging stakeholder communities with the scientific process in a way that genuinely increases the utility of the science for adaptation decision making. Much fundamental climate system research remains to be done, but many of the most critical issues sit at the intersection of natural sciences, social sciences, engineering, decision science, and political economy. Addressing these issues demands a better understanding of the coupled interactions of mean and extreme sea levels, coastal geomorphology, economics, and migration; decision-first approaches that identify and focus research upon those scientific uncertainties most relevant to concrete adaptation choices; and a political economy that allows usable science to become used science.Plain Language Summary The impacts of sea-level rise pose growing threats to coastal communities, economies, and ecosystems, and decisions made today-in areas like land-use policies, coastal development, and infrastructure investment-will affect exposure and vulnerability for generations to come. Thus, the usability of sea-level science is a pressing concern. Ensuring usability requires grappling with deep uncertainty in long-term sea-level projections, the relationship between long-term trends and the impacts of short-lived extreme events, and the ways in which the physical coast, as well as people and ecosystems along the coast, respond to increasingly frequent flooding. At the same time, it also requires more extensive and deliberate stakeholder engagement throughout the scientific process, as well as cognizance of the political economy of linking stakeholder-engaged science to action.

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“…Just as important as understanding the potential for onshore or offshore sediment transport between the upper and lower shoreface [ Aagaard , ] is an understanding of how changes in the upper shoreface are morphologically communicated offshore. The myriad processes that can change coastlines, from overwash [ Donnelly et al, ; Sherwood et al, ] to alongshore sediment transport gradients [ Ashton and Murray , ] or even human activities such as beach nourishment [ Jin et al, ], motivate a better understanding of how the shoreface behaves as a morphologic unit. The focus of this study is the development of a formulation for the long‐term morphodynamic evolution of a sandy wave‐dominated shoreface.…”

Section: Introductionmentioning

confidence: 99%

Exploring shoreface dynamics and a mechanistic explanation for a morphodynamic depth of closure

Ortiz

Ashton

2016

JGR Earth Surface

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Using energetics-based formulations for wave-driven sediment transport, we develop a robust methodology for estimating the morphodynamic evolution of a cross-shore sandy coastal profile. In our approach, wave-driven cross-shore sediment flux depends on three components: two onshore-directed terms (wave asymmetry and wave streaming) and an offshore-directed slope term. In contrast with previous work, which applies shallow water wave assumptions across the transitional zone of the lower shoreface, we use linear Airy wave theory. The cross-shore sediment transport formulation defines a dynamic equilibrium profile and, by perturbing about this steady state profile, we present an advection-diffusion formula for profile evolution. Morphodynamic Péclet analysis suggests that the shoreface is diffusionally dominated. Using this depth-dependent characteristic diffusivity timescale, we distinguish a morphodynamic depth of closure for a given time envelope. Even though wave-driven sediment transport can (and will) occur at depths deeper than this morphodynamic closure depth, the rate of morphologic bed changes in response to shoreline change becomes asymptotically slow. Linear wave theory suggests a shallower shoreface depth of closure and much sharper break in processes than shallow water wave assumptions. Analyzing hindcasted wave data using a weighted frequency-magnitude approach, we determine representative wave conditions for selected sites along the U.S. coastline. Computed equilibrium profiles and depths of closure demonstrate reasonable similarities, except where inheritance is strong. The methodology espoused in this paper can be used to better understand the morphodynamics at the lower shoreface transition with relative ease across a variety of sites and with varied sediment transport equations.

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Optimal Responses to Shoreline Changes: An Integrated Economic and Geological Model With Application to Curved Coasts

Cited by 23 publications

References 30 publications

Simulating barrier island response to sea-level rise with the barrier island and inlet environment (BRIE) model v1.0

Simulating barrier island response to sea-level rise with the barrier island and inlet environment (BRIE) model v1.0

Usable Science for Managing the Risks of Sea‐Level Rise

Exploring shoreface dynamics and a mechanistic explanation for a morphodynamic depth of closure

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