HR: 0800h
AN: H31B-1300    [Abstracts]
TI: Modeling Phosphorus Transport and Cycling in the Greater Everglades Ecosystem
AU: * James, A I
EM: ajames@ufl.edu
AF: Soil and Water Science Dept., 2169 McCarty Hall University of Floida, Gainesville, FL 32611-0290 United States
AU: Grace, K A
EM: grace@ufl.edu
AF: Soil and Water Science Dept., 2169 McCarty Hall University of Floida, Gainesville, FL 32611-0290 United States
AU: Jawitz, J W
EM: jawitz@ufl.edu
AF: Soil and Water Science Dept., 2169 McCarty Hall University of Floida, Gainesville, FL 32611-0290 United States
AU: Muller, S
EM: mullers@ufl.edu
AF: Dept. of Agricultural and Biological Engineering, Frazier Rogers Hall University of Florida, Gainesville, FL 32611-0570 United States
AU: Munoz-Carpena, R
EM: carpena@mail.ifas.ufl.edu
AF: Dept. of Agricultural and Biological Engineering, Frazier Rogers Hall University of Florida, Gainesville, FL 32611-0570 United States
AU: Flaig, E G
EM: eflaig@sfwmd.gov
AF: South Florida Water Management District, P.O. Box 24680, West Palm Beach, FL 33416-4680 United States
AB: A solute transport model was used to predict phosphorus mobility in the northern Everglades. Over the past several decades, agricultural drainage waters discharged into the northern Everglades, have been enriched in phosphorus (P) relative to the historic rainfall-driven inputs. While methods of reducing total P concentrations in the discharge water have been actively pursued through implementation of agricultural Best Management Practices (BMPs), a major parallel effort has focused on the construction of a network of constructed wetlands for P removal before these waters enter the Everglades. This study describes the development of a water quality model for P transport and cycling and its application to a large constructed wetland: Stormwater Treatment Area 1 West (STA 1W), located southeast of Lake Okeechobee on the eastern perimeter of the Everglades Agricultural Area (EAA). In STA 1W agricultural nutrients such as phosphorus (P) are removed from EAA runoff before entering the adjacent Water Conservation Areas (WCAs) and the Everglades. STA 1W is divided by levees into 4 cells, which are flooded for most of the year; thus the dominant mechanism for flow and transport is overland flow. P is removed either through deposition into sediments or is taken up by plants; in either case the soils end up being significantly enriched in P. The model has been applied and calibrated to several years of water quality data from Cell 4 within STA 1W. Most existing P models have been applied to agricultural/upland systems, with only a few relevant to treatment wetlands such as STA 1W. To ensure sufficient flexibility in selecting appropriate system components and reactions, the model has been designed to incorporate a wide range of user-selectable mechanisms for P uptake and release parameters between soils and inflowing water. The model can track a large number of mobile and nonmobile components and utilizes a Godunov-style operator-splitting technique for the transported components. The model is linked with the South Florida Water Management District Regional Simulation Model (SFWMD/RSM), which provides the hydrodynamic data necessary to model chemical transport.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 1847 Modeling
DE: 1852 Plant uptake
DE: 1871 Surface water quality
DE: 1890 Wetlands (0497)
SC: Hydrology [H]
MN: Fall Meeting 2005