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- W2334457908 abstract "The objective of this numerical modeling project is to evaluate the impacts of canal plugs on wetland hydrology. In 1986, a series of eight earthen canal plugs were placed in a main drainage canal in the Upper St.Johns River Basin to attempt to re-establish wetland sheet flow and to prevent marsh overdrainage. While canal plugs retarded canal flow and re-hydrated the marsh, they also prevented the areas of the marsh contiguously upstream of the plugs from experiencing shorter intensity drying events that are essential to maintaining emergent marsh vegetation. As a result of prolonged inundation periods, nearly 1000 acres of emergent marsh (immediately) upstream of the plugs were converted to shallow open water flats. This resulted in undesirable vegetation shifts toward more flood tolerant species. In 1998, we developed a two-dimensional depth averaged finite element (U.S. Army Corps of Engineers RMA2) model to predict surface water elevations over the marsh under a variety of plug configurations. Our objective was to design an optimal plug configuration that would re-create more natural flow conditions in the marsh while minimizing the number of plugs. The model was calibrated from stage data measured during Tropical Storm Gordon (November 1994) and during normal dry season flows. The model was validated using stage data collected during the 1996 and 1997 wet seasons. The model indicated that appropriate marsh hydrology could be created using just three canal plugs instead of eight. Designed canal plug lengths ranged from 183 m (600 ft.) to 305 m (1,000 ft.) in length and each contained an operable culvert capable of passing 2.83 m³/s (100 cfs) downstream." @default.
- W2334457908 created "2016-06-24" @default.
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- W2334457908 date "2001-09-28" @default.
- W2334457908 modified "2023-09-23" @default.
- W2334457908 title "Numerical Simulation of the Effect of the Canal Plugs on the Modification of Saint Johns Marsh Conservation Area Hydraulics in the Upper St. Johns River Basin, Florida" @default.
- W2334457908 doi "https://doi.org/10.1061/40581(2001)53" @default.
- W2334457908 hasPublicationYear "2001" @default.
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