scholarly journals Seagrass Impact on Sediment Exchange Between Tidal Flats and Salt Marsh, and The Sediment Budget of Shallow Bays

2018 ◽  
Vol 45 (10) ◽  
pp. 4933-4943 ◽  
Author(s):  
Carmine Donatelli ◽  
Neil Kamal Ganju ◽  
Sergio Fagherazzi ◽  
Nicoletta Leonardi
Keyword(s):  
Salt Marsh ◽  
Tidal Flats ◽  
Sediment Budget

Impact of salt marsh and seagrass beds on the sediemnt buget and resilience of coatsal areas

2020 ◽  
Author(s):  
Nicoletta Leonardi ◽  
Carmine Donatelli ◽  
Xiahoe Zhang ◽  
Neil Ganju ◽  
Sergio Fagherazzi
Keyword(s):  
Salt Marsh ◽  
Water Resources ◽  
Salt Marshes ◽  
Numerical Models ◽  
Sediment Budget ◽  
Coastal Protection ◽  
Seagrass Beds ◽  
Geophysical Research ◽  
Coastal System ◽  
Depositional Patterns

<p>Salt marshes and seagrass beds can offer sustainable coastal protection solutions and several ecosystem co-benefits. The delicate balance regulating salt marsh stability depends on several factors including the sediment added to and removed from the coastal system (<em>Donatelli et al., 2018, 2019; Zhang et al., 2019</em>).  Despite the importance of these sediment budget dynamics, many feedbacks between salt marsh presence and sediment availability are still unclear. Here, we use numerical models to simulate changes in depositional patterns of six estuaries along the U.S. coastline to investigate how salt marsh and seagrass beds removal and restoration can alter the sediment budget and resilience of coastal environments. </p><p><em>Donatelli, C., Ganju, N.K., Kalra, T.S., Fagherazzi, S. and Leonardi, N., 2019. Changes in hydrodynamics and wave energy as a result of seagrass decline along the shoreline of a microtidal back-barrier estuary. Advances in Water Resources, 128, pp.183-192.</em></p><p><em>Zhang, X., Leonardi, N., Donatelli, C. and Fagherazzi, S., 2019. Fate of cohesive sediments in a marsh-dominated estuary. Advances in water resources, 125, pp.32-40.</em></p><p><em>Donatelli, C., Ganju, N.K., Fagherazzi, S. and Leonardi, N., 2018. Seagrass impact on sediment exchange between tidal flats and salt marsh, and the sediment budget of shallow bays. Geophysical Research Letters, 45(10), pp.4933-4943.</em></p>

Salt marsh resilience to sea-level rise and increased storm intensity

2021 ◽  
Author(s):  
Natascia Pannozzo ◽  
Nicoletta Leonardi ◽  
Iacopo Carnacina ◽  
Rachel Smedley
Keyword(s):  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Storm Surge ◽  
Salt Marshes ◽  
Sediment Budget ◽  
Geophysical Research ◽  
Storm Intensity ◽  
Combined Impact ◽  
And Sea Level

<p>Salt marshes are widely recognised as ecosystems with high economic and environmental value. However, it is still unclear how salt marshes will respond to the combined impact of future sea-level rise and possible increases in storm intensity (Schuerch et al. 2013). This study investigates marsh resilience under the combined impact of various storm surge and sea-level scenarios by using a sediment budget approach. The current paradigm is that a positive sediment budget supports the accretion of salt marshes and, therefore, its survival, while a negative sediment budget causes marsh degradation (Ganju et al. 2015). The Ribble Estuary, North-West England, was used as test case, and the hydrodynamic model Delft3D was used to simulate the response of the salt marsh system to the above scenarios. We conclude that the resilience of salt marshes and estuarine systems is enhanced under the effect of storm surges, as they promote flood dominance and trigger a net import of sediment.  Conversely, sea-level rise threatens marsh stability, by promoting ebb dominance and triggering a net export of sediment. Ultimately, when storm surge and sea-level scenarios are combined, results show that storms with the highest intensities have the potential to counteract the negative impact of sea-level rise by masking its effects on the sediment budget.</p><p><strong>Acknowledgements</strong></p><p>We acknowledge the support of the School of Environmental Sciences, University of Liverpool.</p><p><strong>References</strong></p><p>Ganju, N.K., Kirwan, M.L., Dickhudt, P.J., Guntenspergen, G.R., Cahoon, D.R. and Kroeger, K.D. 2015. “Sediment transport-based metrics of wetland stability”. Geophysical Research Letters, 42(19), 7992-8000.</p><p>Schuerch, M., Vafeidis, A., Slawig, T. and Temmerman, S. 2013. “Modeling the influence of changing storm patterns on the ability of a salt marsh to keep pace with sea level rise”. Journal of Geophysical Research-Earth Surface, 118(1),<strong> </strong>84-96.</p>

Assessing the relation between the distribution of salt-marsh communities and the sediment budget of the North Norfolk coast

2002 ◽  
Vol 8 (1) ◽  
pp. 55 ◽  
Author(s):  
N.J. Brown ◽  
R. Cox ◽  
R. Pakeman ◽  
A.G. Thomson ◽  
R.A. Wadsworth ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Sediment Budget ◽  
The North

Assessing the relation between the distribution of salt-marsh communities and the sediment budget of the North Norfolk coast

2002 ◽  
Vol 8 (1) ◽  
pp. 55-60
Author(s):  
N. J. Brown ◽  
R. Cox ◽  
R. Pakeman ◽  
A. G. Thomson ◽  
R. A. Wadsworth ◽  
...  
Keyword(s):  
Salt Marsh ◽  
Sediment Budget ◽  
The North

Beaches and beach-related facies, Holocene barrier islands of Georgia

1988 ◽  
Vol 125 (6) ◽  
pp. 621-640 ◽  
Author(s):  
R. W. Frey ◽  
J. D. Howard
Keyword(s):  
Salt Marsh ◽  
Dynamic Equilibrium ◽  
Barrier Islands ◽  
Tidal Flats ◽  
Depositional Environments ◽  
Low Energy ◽  
Tidal Inlets ◽  
Gradual Rise ◽  
Vertical Relationships ◽  
Georgia Bight

AbstractThe mesotidal coast of Georgia encompasses diverse sedimentary features and depositional environments, most of which typify major facies of the entire Georgia Bight – a broad embayment on the southeastern U.S. shelf. Barrier island strandline environments especially include tidal inlets and shoals, the beach shoreface, foreshore, and backshore, and dunes and washover fans. Low energy beach segments may grade directly into small seaside tidal flats. Relict salt marsh deposits crop out on erosional beaches. All deposits are in dynamic equilibrium with fluctuating coastal conditions and a gradual rise in sea level.Most of these facies are important in interpreting ancient epeiric transgressive/regressive coastal sequences. Pronounced local variations in the overall sequence result from complex latero-vertical relationships between (1) the shoreface, foreshore, and shoals, and (2) the shoals, low energy beaches, and beach-related tidal flats. Washover fans and relict deposits on erosional beaches cause perturbations within present day lateral relationships but are normal in transgressive facies tracts along such coasts. Close stratigraphic control of outcrops or cores would be necessary for detailed reconstructions of, or correlations among, ancient analogs.

Potential uses of TerraSAR-X for mapping herbaceous halophytes over salt marsh and tidal flats

2012 ◽  
Vol 115 ◽  
pp. 366-376 ◽  
Author(s):  
Yoon-Kyung Lee ◽  
Jeong-Won Park ◽  
Jong-Kuk Choi ◽  
Yisok Oh ◽  
Joong-Sun Won
Keyword(s):  
Salt Marsh ◽  
Tidal Flats

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

2018 ◽  
Vol 123 (10) ◽  
pp. 2647-2662 ◽  
Author(s):  
Carmine Donatelli ◽  
Neil Kamal Ganju ◽  
Xiaohe Zhang ◽  
Sergio Fagherazzi ◽  
Nicoletta Leonardi
Keyword(s):  
Salt Marsh ◽  
Sediment Budget ◽  
Marsh Loss
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