FastTABS Software for Evaluation of Wetlands Hydrodynamics
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
Pagination or Media Count:
This note documents how recent software developments FastTABS can be used in the evaluation of two-dimensional wetland hydrodynamics. Rivers, reservoirs, and estuaries have been modeled for a number of years using the U.S. Army Corps of Engineers TABS numerical modeling system. TABS is a family of numerical models that can simulate hydrodynamic, sediment, and constituent transport processes in these water bodies. One of the most attractive features of the TABS system is the ability to simulate wetting and drying of shallow areas caused by either discharge fluctuations in rivers or tidal fluctuations in estuaries. While this capability has existed for some time, it has only recently been used for applications where wetlands were the primary interest. Recently, there has been an increased awareness of the impacts of Corps projects in neighboring wetland areas. In some cases, the Corps was asked to mitigate their projects by creating new wetland areas where they didnt previously exist or by renovating deteriorated wetlands. Based on the wetland type and function desired, suitable hydraulic conditions need to be designed into the created or renovated wetland. Given that hydraulic conditions are often not controllable, geometry of the wetland is the single controllable characteristic that can affect frequency and depth of inundation. The design of wetlands then becomes an iterative process that requires several trial geometries for a given set of hydraulic inputs. Since this iterative process can be time consuming, efficient model setup and boundary condition assignment is required. The TABS system consists of many separate programs for mesh development, geometry input file generation, boundary condition definition, hydrodynamic input file generation, job status monitoring, and post-processing of the results. The TABS system is used to model two sites Bodkin Island black duck habitat in the Chesapeake Bay and the Galilee Bird Sanctuary, Rhode Island.
- Geology, Geochemistry and Mineralogy
- Hydrology, Limnology and Potamology
- Computer Programming and Software
- Fluid Mechanics