Modeling the Morphodynamics of Coastal Responses to Extreme Events: What Shape Are We In?

Area of Science:

• Coastal geomorphology
• Numerical modeling
• Extreme weather events

Background:

• Sandy coasts are vulnerable to extreme storms.
• Accurate prediction of storm impacts is crucial for coastal management.
• Process-based numerical models are key tools for understanding these impacts.

Purpose of the Study:

• To review recent advancements in process-based numerical models for simulating extreme storm impacts on sandy coasts.
• To highlight key developments in model complexity and physical process representation.
• To discuss improvements in data assimilation and forcing data.

Main Methods:

• Review of current literature on numerical models for coastal morphodynamics.
• Analysis of model advancements, including added processes and improved physics.
• Examination of enhanced forcing data (meteorology, hydrodynamics) and initial condition observations.
• Discussion of algorithms for wave-induced flows and sediment transport.

Main Results:

• Models are becoming more comprehensive by incorporating a wider range of processes.
• Increased model depth is achieved through detailed physics replacing parameterizations.
• Recent developments include improved algorithms for wave-induced flows and sediment transport.
• Community and open-source models are now standard, fostering collaboration and accessibility.

Conclusions:

• Enhanced model skill is attributed to better-resolved and more accurate forcing data.
• Future models are expected to resolve individual waves and utilize data assimilation.
• Ensemble modeling will be increasingly employed to predict uncertainties in storm impacts.