A surface porosity approach for eliminating artificial ponding in coastal salt marsh simulations

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Author(s)Deb, Mithun
Author(s)Kirby, James T.
Author(s)Abdolali, Ali
Author(s)Shi, Fengyan
Date Accessioned2023-03-16T14:25:14Z
Date Available2023-03-16T14:25:14Z
Publication Date2022-11-23
DescriptionThis article was originally published in Coastal Engineering. The version of record is available at: https://doi.org/10.1016/j.coastaleng.2022.104246. This article will be embargoed until 11/23/2024.
AbstractHydrodynamic processes over marsh topography are significantly affected by surface defects such as cuts and rills on channel berms and platforms. These meter-scale features are often missing in the model representation due to the spatial resolution available from data sources, as well as incomplete resolution in the model grid itself. To minimize the artificial hydraulic isolation in the numerical models, we propose implementing an effective porosity algorithm on the marsh surface by considering the fine-scale topography over marsh depressions that control the drainage process. The modification is carried out to eliminate artificial ponding effects observed in model simulations in Bombay Hook National Wildlife Refuge, DE, USA using the original FVCOM code. Results from the revised and original FVCOM models are compared with pressure gauge data collected from an isolated depression in the marsh platform. The new implementations for proper wetting and drying are efficient and accurate for hydrodynamic modeling inside a complex salt-marsh system, which constitutes a major breakthrough in the context of increasing need for better understanding of physical and morphological changes in valuable coastal ecosystems.
SponsorThis study was supported by the Delaware Sea Grant Program, projects R/HRCC-2 and R/RCE-2, and by the use of Information technologies (IT) resources at the University of Delaware. Field data collection was supported by the National Fish and Wildlife Foundation (US Department of the Interior) under Grant No. 43752 to the University of Delaware. We express our thanks to Susan Guiteras and the staff of the Bombay Hook National Wildlife Refuge (BHNWR) for their extensive support of our field data collection efforts, and acknowledge the input of our colleague Chris Sommerfield (deceased) in the original conception of our studies of the BHNWR marsh system. Finally, we want to thank Dr. Sergio Fagherazzi for his valuable suggestions during the review process. A description of data generated during the study can be found in Deb et al. (2018b). Modifications to the FVCOM code developed as part of the study are documented at https://github.com/mithundeb/FVCOM---slot-porosity.
CitationDeb, Mithun, James T. Kirby, Ali Abdolali, and Fengyan Shi. “A Surface Porosity Approach for Eliminating Artificial Ponding in Coastal Salt Marsh Simulations.” Coastal Engineering 179 (January 1, 2023): 104246. https://doi.org/10.1016/j.coastaleng.2022.104246.
ISSN1872-7379
URLhttps://udspace.udel.edu/handle/19716/32460
Languageen_US
PublisherCoastal Engineering
Keywordstidal wetlands
Keywordssalt marshes
Keywordswetting and drying
Keywordsnumerical modeling
Keywordsartificial ponding
Keywordsmarsh flooding and draining
TitleA surface porosity approach for eliminating artificial ponding in coastal salt marsh simulations
TypeArticle
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