SUB-GRID MODELING OF COUPLED HYDRODYNAMIC, VEGETATIVE AND MORPHODYNAMIC PROCESSES IN A SALT MARSH ENVIRONMENT

Mithun T. Deb, James T. Kirby, Fengyan Shi, Guoxiang Wu, Ali Abdolali

Abstract


Modeling hydrodynamic processes in a salt marsh system is a challenging task, due to the complexity of topographic features and the scale of such features relative to the overall system size. With growing availability of high-resolution topographic measurements, like LiDAR-derived DEM data, it is increasingly desirable to run a high-resolution model in a large domain and for a long period of time to get trends of sedimentation patterns, morphological change and marsh evolution. However, high spatial resolution poses a big challenge in both computational time and memory storage. Vegetation dynamics in a marsh system needs to be properly taken care of with respect to the vegetation zones and elevation from the mean sea level. The interaction between micro-scale topography and vegetation canopy dominates the overall morphological evolution.

Full Text:

PDF

References


D'Alpaos, A., Lanzoni, S., Marani, M. and Rinaldo, A. (2007): Landscape evolution in tidal embayments: Modeling the interplay of erosion sedimentation and vegetation dynamics, J. Geophys. Res., 112, F01008.

Defina, A. (2000): Two-dimensional shallow flow equations for partially dry areas. Water Resources Research, 36(11), 3251.

Volp, N. D., Van Prooijen, B. C. and Stelling, G. S. (2013): A finite volume approach for shallow water flow accounting for high-resolution bathymetry and roughness data. Water Resources Research, 49(7), 4126-4135.

Volp, N. D., van Prooijen, B. C., Pietrzak, J. D. and Stelling, G. S. (2016): A subgrid based approach for morphodynamic modelling. Advances in Water Resources, 93, 105-117.

Wu, G., Shi, F., Kirby, J. T., Mieras, R., Liang, B., Li, H. and Shi, J. (2016): A pre-storage, subgrid model for simulating flooding and draining processes in salt marshes. Coastal Engineering, 108, 65-78.

Wu, G., Li, H., Liang, B., Shi, F., Kirby, J. T. and Mieras, R. (2017): Subgrid modeling of salt marsh hydrodynamics with effects of vegetation and vegetation zonation. Earth Surface Processes and Landforms, published online doi:10.1002/esp.4121.




DOI: https://doi.org/10.9753/icce.v36.sediment.87