What question did this study set out to answer?

To evaluate the physical stability of tidal marsh sediment beds and winter-state vegetation exposed to extreme flow velocities characteristic of dike-breach events.

July 28, 2022Socio-Environmental Systems ModelingOpen Access

Stability of a Tidal Marsh Under Very High Flow Velocities and Implications for Nature-Based Flood Defense

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Authors

KSKen SchoutensUniversity of Antwerp MSMarte StoorvogelUtrecht University MBMario van den BergDelft University of Technology

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Implication

Flume experiment demonstrates minimal erosion in tidal marsh monoliths under high flow velocities, suggesting their viability as nature-based flood barriers.

Key Points

To evaluate the physical stability of tidal marsh sediment beds and winter-state vegetation exposed to extreme flow velocities characteristic of dike-breach events.
Excavated Phragmites australis marsh monoliths from the Scheldt estuary and mounted them in a 10-meter flume test section.
Conducted 6 experimental runs testing flow velocities up to 1.75 m/s and water depths up to 0.35 m for 2 hours per run (12 cumulative hours), including tests with manually removed aboveground vegetation.
Sediment bed erosion was restricted to only a few millimeters across the full 12-hour cumulative exposure to high-velocity flow.
Manual removal of aboveground plant stems did not increase erosion, highlighting the stabilizing role of consolidated clay- and silt-rich sediment alongside dense root networks.
Phragmites australis stems bent under high-velocity currents, yet the majority of shoots quickly recovered an upright position after flow ceased.

Cite This Study

Schoutens et al. (2022) studied this question.

synapsesocial.com/papers/6a7d8edb7b274e93dd14fd90 https://doi.org/10.3389/fmars.2022.920480

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Implication

Flume experiment demonstrates minimal erosion in tidal marsh monoliths under high flow velocities, suggesting their viability as nature-based flood barriers.

Stability of a Tidal Marsh Under Very High Flow Velocities and Implications for Nature-Based Flood Defense

Discussion

Member takes

Implication

Key Points

Cite This Study

Stability of a Tidal Marsh Under Very High Flow Velocities and Implications for Nature-Based Flood Defense

Discussion

Member takes

Implication

Key Points

Cite This Study

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