The Existence and Origin of Multiple Equilibria in Sand‐Mud Sediment Beds

Alonso, Ángela; Maren, D.S. van; Herman, Peter M. J.; Weerdenburg, R. J. A. van; Huismans, Ymkje; Holthuijsen, Sander; Govers, Laura L.; Bijleveld, Allert I.; Wang, Zheng Bing

doi:10.1029/2022gl101141

Cited by 8 publications

(15 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(g–i) Bimodal distribution p mud of the upper sediment bed on the intertidal areas of the Wadden Sea basins, based on Colina Alonso et al. (2022).…”

Section: Resultsmentioning

confidence: 99%

“…Bathymetry data of the German Wadden Sea (EasyGSH) are available at (Bundesanstalt Für Wasserbau, 2020): https://doi.org/10.48437/02.2020.K2.7000.0002. Sediment composition information was obtained from Colina Alonso et al (2022), which used the SIBES data set, the Sediment Atlas Wadden Sea (Rijkswaterstaat, 1998), and via the EasyGSH data set (Sievers et al, 2020): https://doi.org/10.48437/02.2020. K2.7000.0005.…”

Section: Data Availability Statementmentioning

confidence: 99%

See 1 more Smart Citation

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

Colina Alonso,

van Maren,

van Weerdenburg

et al. 2023

JGR Earth Surface

Self Cite

View full text Add to dashboard Cite

The morphology of tide‐dominated systems is progressively influenced by human activities and climate change. Quantitative approaches aiming at understanding or forecasting the effects of interventions and climate change are often aggregated, thereby simplifying or schematizing the investigated area. In this work, we advance on the knowledge of sediment transport processes shaping tidal systems and on methodologies translating schematized model output into physically realistic variables. In terms of improved physics, we systematically evaluate the influence of sand‐mud interaction processes. Most tidal systems are shaped by a mixture of sand and mud. Morphological models typically compute transport of sand and mud independently, despite studies clearly demonstrating that their physical behavior is mutually dependent. We investigate the effects of two interaction mechanisms (erosion interaction and roughness interaction, applied with varying mud erodibility) with a schematized process‐based morphodynamic model. We convert model output into metrics that describe the meso‐scale configuration of the modeled systems, allowing a quantitative comparison of scenarios. Modeled patterns and intertidal flat shape, size and composition widely vary with mud erodibility settings, but equally depend on the evaluated sand‐mud interaction mechanisms (with erosion interaction having a larger effect than roughness interaction). Sand‐mud interaction thus needs to be accounted for from a physical point of view, but also to improve predictions of tidal basin evolution models, particularly the (bimodally distributed) sediment composition of intertidal flats.

show abstract

“…(g–i) Bimodal distribution p mud of the upper sediment bed on the intertidal areas of the Wadden Sea basins, based on Colina Alonso et al. (2022).…”

Section: Resultsmentioning

confidence: 99%

Section: Data Availability Statementmentioning

confidence: 99%

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

Colina Alonso,

van Maren,

van Weerdenburg

et al. 2023

JGR Earth Surface

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Modelling Long-term Marsh Elevation Changes Until 2100mentioning

confidence: 99%

“…The Holwerd salt marshes are located at the mainland of the Netherlands close to the tidal divide to Ameland and is characterised by relatively high suspended matter concentrations (Colina Alonso et al, 2022). Other salt marshes, particularly those on the Wadden islands, have lower suspended matter concentrations (Sassi et al, 2015;Colina Alonso et al, 2022). Furthermore, human interventions may lead to a lowering of sediment concentrations and sediment import may become insufficient with accelerated sea level rise (Wang et al, 2015).…”

Section: Modelling Long-term Marsh Elevation Changes Until 2100mentioning

confidence: 99%

See 1 more Smart Citation

Biocompacting livestock accelerate drowning of tidal salt marshes with sea level rise

2023

View full text Add to dashboard Cite

A global concern for coastal ecosystems is the predicted rise in sea-level for which salt marshes must keep pace by increasing in surface elevation sufficiently. Variables that control this elevation change need to be identified to predict the adaptability of marshes to future sea-level rise. Many European marshes are grazed by livestock and these heavy grazers can biocompact the soil, a process often underestimated in studies assessing the long-term survival of marshes. We measured elevation changes for thirteen years in the field in grazed and non-grazed marshes. With a statistical model the most important factors controlling rates of surface elevation change were identified and provided the input for a mathematical model to study future elevation change of grazed and non-grazed salt marshes up to 2100 under three Sea Level Rise and sediment supply scenarios. We found that trampling by grazing cattle significantly reduced the annual rates of elevation gain from 11.9 mm yr-1 in the non-grazed marsh to 3.6 mm yr-1 in the grazed marsh. Next to biocompaction by livestock, precipitation deficit and extreme drought resulted in extra compaction. Our model results showed that cattle presence had a negative impact on the future adaptability of salt marshes to grow vertically for rising sea levels. Biocompaction reduced the total elevation change by 42% if the current linear SLR does not accelerate. For an accelerating and high SLR to 109 cm +NAP in 2100, biocompaction reduced elevation changes by 12% and the grazed marsh can no longer outcompete the rise in sea level from around 2050 onwards, compared to the non-grazed marsh. The grazed marsh will slowly drown but this will not lead to a significant change in vegetation composition yet. For an extreme SLR to 195 cm +NAP in 2100 the elevation changes in both the grazed and non-grazed marshes cannot keep pace with the rise in sea level and the marsh vegetation is expected to show regression to plants typical for a low marsh. A reduction in sediment supply will aggravate the effects of SLR and may result in highly increasing inundation frequencies and subsequent disappearance of the marsh vegetation.

show abstract

Predicting ecotopes from hydrodynamic model data: Towards an ecological assessment of nature-based solutions

Brunink,

Hendrickx

2024

Nature-Based Solutions

View full text Add to dashboard Cite

The Existence and Origin of Multiple Equilibria in Sand‐Mud Sediment Beds

Cited by 8 publications

References 38 publications

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

Biocompacting livestock accelerate drowning of tidal salt marshes with sea level rise

Predicting ecotopes from hydrodynamic model data: Towards an ecological assessment of nature-based solutions

Contact Info

Product

Resources

About