Salt Marsh Loss Affects Tides and the Sediment Budget in Shallow Bays

Donatelli, Carmine; Ganju, Neil K.; Zhang, Xiaohe; Fagherazzi, Sergio; Leonardi, Nicoletta

doi:10.1029/2018jf004617

Cited by 59 publications

(58 citation statements)

References 75 publications

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“…The dynamical system approach is very powerful and should be extended to include novel schematizations of the marsh system. The general pathway to create such models is based on four steps: (1) the use of highly detailed hydrodynamic models to identify feedbacks (e.g., Donatelli et al, 2018; Mariotti et al, 2010), (2) the schematization and aggregation of the system into geometric compartments (i.e., points), (3) the formulation of simplified, yet mass conserving, fluxes between the compartments, and (4) the inclusion of all external inputs and outputs of sediment.…”

Section: Nonlinear Dynamics and Stability Analysis Applied To Salt Mamentioning

confidence: 99%

“…Ganju et al (2017) have shown that the sediment budget of the marsh‐tidal flat complex scales with the unvegetated/vegetated marsh ratio of the estuarine system, suggesting that this metric can be used as an indicator of marsh vulnerability. However, the external inputs and outputs of sediment are not the only factors influencing the marsh capability to retain sediments, and the sediment dynamics within the marsh complex can also cause spatial and temporal variability in the sediment budget (e.g., Donatelli et al, 2018, 2019; Li & Yang, 2009; Mei et al, 2016; Temmerman et al, 2005; Zhang et al, 2019).…”

Section: Assessment Of Marsh Vulnerability and Resilience Through Sedmentioning

confidence: 99%

“…Loss of sediment from the littoral system eventually leads to the breaching of the barrier islands and runaway transgression. Recent results from Donatelli et al (2018) have shown that marsh area is pivotal for determining the sediment storage capability of whole embayments and that, as salt marsh areas decrease, the sediment trapping capacity of the entire embayment also decreases. This decrease in sediment trapping includes sediments trapped on tidal flats as well as sediments trapped on marsh platforms.…”

Section: Assessment Of Marsh Vulnerability and Resilience Through Sedmentioning

confidence: 99%

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Salt Marsh Dynamics in a Period of Accelerated Sea Level Rise

et al. 2020

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Salt marshes are dynamic systems able to laterally expand, contract, and vertically accrete in response to sea level rise. Here, we present the grand challenges that need to be addressed to fully characterize marsh morphodynamics. The review focuses on physical processes and quantitative models. Without predictive models, it is impossible to determine the future marsh evolution under accelerated sea level rise. In these models, one of the challenges is to resolve both horizontal and vertical dynamics within the same framework. Vertically, the marsh has to accumulate enough material to contrast rising water levels. Horizontally, marsh erosion at the ocean side must be compensated by landward expansion in forests, lawns, and agricultural fields. The dynamics of the marsh‐upland boundary are still not fully understood and will require more research in the upcoming years. The complexity of marsh vegetation is seldom captured in predictive models of marsh evolution. More research is needed to understand the effects of each species or species assemblages on hydrodynamics and sediment transport. Here, we further advocate that a sediment budget resolving all sediment fluxes in a marsh complex is the most important metric of marsh resilience. Characterization of these fluxes will enable to connect salt marshes to other landforms and to unravel feedbacks controlling the evolution of the entire coastal system. Current models of marsh evolution rely on sparse data sets collected at few locations. Novel remote sensing techniques will provide high‐resolution spatial data that will inform a new generation of computer models.

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Section: Nonlinear Dynamics and Stability Analysis Applied To Salt Mamentioning

confidence: 99%

Section: Assessment Of Marsh Vulnerability and Resilience Through Sedmentioning

confidence: 99%

Section: Assessment Of Marsh Vulnerability and Resilience Through Sedmentioning

confidence: 99%

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Salt Marsh Dynamics in a Period of Accelerated Sea Level Rise

et al. 2020

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“…This asymmetry, that strongly depends on the bathymetry, can produce flood periods shorter than ebb periods, and flood velocities larger than ebb velocities [42,86,94]. The areas with the highest variation in tidal amplitude are frequently the ones where geometric variations associated with marsh loss are more pronounced [95].…”

Section: Tidal Asymmetrymentioning

confidence: 99%

Natural and Human-Induced Flow and Sediment Transport within Tidal Creek Networks Influenced by Ocean-Bay Tides

Zarzuelo

D’Alpaos

Carniello

et al. 2019

Water

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Improving current understanding of hydrodynamics and sediment dynamics in complex tidal embayments is of major importance to face future challenges derived from climate change and increasing human pressure. This work deepens the knowledge of the hydro-morphodynamics of complex creek networks that connect basins with different characteristics, identifying their morphodynamic trends and the potential impacts of channel deepening. We selected two tidal creeks which flow through salt marshes and tidal flats of the Cádiz Bay (SW Spain) in a singular network due to their double connection to the Atlantic Ocean and the inner bay. We study the interactions between tidal waves that penetrate into the creeks from these two different bodies of water, analyzing the tidal asymmetry and the morphodynamic tendencies of the system. For the analysis, we set up a hydro-morphodynamic model specifically developed for areas with very shallow and complex channels. Results show that the tidal wave penetrates within the tidal network both from the inner Bay and the open ocean with different amplitudes, phases and flow velocities. There is also an asymmetric pattern for the tidal flows caused by the deformation of the dominant astronomical tidal constituents, M2 and M4, due to the non-linear interaction of tidal currents with the irregular creek geometry and bottom topography. Tidal asymmetry promotes the progressive infilling of the area where the tidal waves meet closing the connection between the open ocean and the inner bay, such an infilling trend being accelerated by human interventions.

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“…Erosive cliffs continue south and give rise to a relatively smooth shoreline profile. Marsh areas and vegetated surfaces can be especially relevant for the mitigation of extreme water levels [46][47][48][49]. Five major nesses, i.e., projections originating from sandy deposits, are then present along the coast at Winterton (around 52.72N, 1.7E), Caister (52.62N, 1.74E), Lowestoft (52.48N, 1.76E), Benacre (52.38N, 1.71E) and Thorpeness (52.17N, 1.61E) [50].…”

Section: Study Sitementioning

confidence: 99%

A Numerical Investigation on Tidally Induced Sediment Transport and Morphological Changes with Changing Sea Level in South-East England

Leonardi

Carnacina

2019

Geosciences

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The impact of tide-induced morphological changes and water level variations on the sediment transport in a tidally dominated system has been investigated using the numerical model Delft3D and South-East England as a test case. The goal of this manuscript is to explore the long-term changes in morphology due to sea level rise and the large-scale morphodynamic equilibrium of the South-East England. Our results suggest that the long term (century scale) tidally-induced morphological evolution of the seabed slows down in time and promotes a vanishing net transport across the large scale system. Century-scale morphologically updated simulations show that both morphological changes and net transport values tend to decrease in time as the system attains a dynamic equilibrium configuration. Results further suggest that the presence of a gradual increase in mean sea level accelerates the initial morphological evolution of the system whose morphological rate of change gradually attains, however, same plateau values as in the absence of sea level rise. Given the same base morphology, increasing water levels enhance residual currents and the net transport near the coastline; and vice-versa, decreasing sea levels minimize both residuals and net transport near the coastline. The areas that are more affected by, water level and morphological changes, are the ones where the net transport is the highest. This manuscript explores and allows extending the idea of morphodynamic equilibrium at a regional scale, larger than the one for which this concept has been generally explored i.e., estuarine scale.

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Salt Marsh Loss Affects Tides and the Sediment Budget in Shallow Bays

Cited by 59 publications

References 75 publications

Salt Marsh Dynamics in a Period of Accelerated Sea Level Rise

Salt Marsh Dynamics in a Period of Accelerated Sea Level Rise

Natural and Human-Induced Flow and Sediment Transport within Tidal Creek Networks Influenced by Ocean-Bay Tides

A Numerical Investigation on Tidally Induced Sediment Transport and Morphological Changes with Changing Sea Level in South-East England

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