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Updated: Jul 16, 2026
07:26
Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
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A coupled geomorphic and ecological model of tidal marsh evolution
Matthew L Kirwan1, A Brad Murray
1Nicholas School of the Environment and Earth Sciences, Center for Nonlinear and Complex Systems, Duke University, Durham, NC 27708, USA. mlk13@duke.edu
Summary
This study models tidal marsh evolution, linking physical erosion and vegetation growth. Findings show vegetation can stabilize marshes against sea-level rise, but disturbances risk habitat loss.
Area of Science:
- Coastal geomorphology
- Ecological modeling
Background:
- Tidal marsh platforms and channel networks are shaped by complex interactions between biological and physical processes.
- Understanding these coupled dynamics is crucial for predicting marsh evolution.
Purpose of the Study:
- To develop and utilize a 3D model coupling physical sediment transport with vegetation biomass productivity.
- To investigate the influence of sea-level rise and sediment supply on marsh accretion and channel network development.
Main Methods:
- Developed a 3D numerical model integrating sediment transport and vegetation dynamics.
- Simulated marsh platform accretion and channel network evolution under varying sea-level rise rates and sediment supplies.
Main Results:
- Under steady sea-level rise, marshes maintain elevation with constant water depths and productivity.
- Increased sea-level rise or reduced sediment supply leads to higher marsh surfaces, increased biomass, and expanded channel networks.
- Vegetation promotes a metastable equilibrium, maintaining marsh elevation against rising sea levels.
Conclusions:
- Vegetation plays a critical role in tidal marsh stability and resilience to sea-level rise.
- Disturbances to marsh vegetation can lead to irreversible habitat loss, highlighting the importance of conservation.
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