A pre-storage, subgrid model for simulating flooding and draining processes in salt marshes

Wu, Guoxiang; Shi, Fengyan; Kirby, James T.; Mieras, Ryan S.; Liang, Bingchen; Li, Huajun; Shi, Jian

doi:10.1016/j.coastaleng.2015.11.008

Cited by 25 publications

(20 citation statements)

References 19 publications

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“…Wu et al. () developed a depth‐integrated subgrid model for simulating hydrodynamics in salt marshes. The subgrid model uses two grids: a coarse grid (computational grid) and a fine grid (subgrid).…”

Section: Model Formulations and Setupmentioning

confidence: 99%

“…Here, only the main governing equations are listed, and we refer readers to Wu et al. () and Defina () for more details. The mass conservation equation can be written as

normal Θ \frac{\partial η}{\partial t} + \frac{\partial P}{\partial x} + \frac{\partial Q}{\partial y} = 0

where the volume flux ( q = P i + Q j ), η is the surface elevation, and Θ is the wet fraction.…”

Section: Model Formulations and Setupmentioning

confidence: 99%

“…; Wu et al. ). This method is easy to implement and model results can match observations if bottom roughness values are tuned properly.…”

Section: Introductionmentioning

confidence: 98%

“…Subgrid models, which can account for high‐resolution, subgrid bathymetry and roughness information in coarse‐grid computations, showed great promise for simulating the flooding and draining processes in complex salt marshes with narrow creeks bisecting flats (Wu et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, a vegetation model is implemented in a recently developed subgrid model Wu et al. (). Vegetation is regarded as a distribution of rigid cylinders, and the induced drag forces are introduced as source terms in the momentum equations.…”

Section: Introductionmentioning

confidence: 99%

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Subgrid modeling of salt marsh hydrodynamics with effects of vegetation and vegetation zonation

Liang

et al. 2017

Earth Surf Processes Landf

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Vegetation plays a critical role in modifying inundation and flow patterns in salt marshes. In this study, the effects of vegetation are derived and implemented in a high-resolution, subgrid model recently developed for simulating salt marsh hydrodynamics. Vegetation-induced drag forces are taken into account as momentum sink terms. The model is then applied to simulate the flooding and draining processes in a meso-tidal salt marsh, both with and without vegetation effects. Marsh inundation and flow patterns are significantly changed with the presence of vegetation. A smaller area of inundation occurs when vegetation is considered. Tides propagate both on the platform and through the channels when vegetation is absent, whereas flows concentrate mainly in channels when vegetation is present. Local inundation on vegetated platforms is caused mainly by water flux spilled from nearby channels, with a flow direction perpendicular to the channel edges, whereas inundation on bare platforms has contributions from both local spilled-over water flux and remote advection from adjacent platforms. The flooding characteristics predicted by the model showed a significant difference between higher marsh and lower marsh, which is consistent with the wetlands classification by the National Wetlands Inventory (NWI). The flooding characteristics and spatial distribution of hydroperiod are also highly correlated with the vegetation zonation patterns observed in Google Earth imagery. Regarding the strong interaction between flow, vegetation and geomorphology, the conclusion highlights the importance of including vegetation in the modeling of salt marsh dynamics.

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Section: Model Formulations and Setupmentioning

confidence: 99%

“…Here, only the main governing equations are listed, and we refer readers to Wu et al. () and Defina () for more details. The mass conservation equation can be written as