An Integrated Media, Integrated Processes Watershed ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

An Integrated Media, Integrated Processes Watershed Model – WASH123D: Part 5 – Integrated modeling of surface water and groundwater interactions in a constructed wetland
Author:GUOBIAO HUANG <> (Sutron Corporation, West Palm Beach, FL, USA)
Gour-Tsyh Yeh <> (Dept of Civil and Environ. Eng., Univ. of Central Florida, Orlando, FL, USA)
Presenter:Gour-Tsyh Yeh <> (Dept of Civil and Environ. Eng., Univ. of Central Florida, Orlando, FL, USA)
Date: 2006-06-18     Track: General Sessions     Session: General

A pilot constructed wetland in south Florida, USA, the Everglades Nutrient Removal (ENR) project was modeled with a physics-based integrated approach by WASH123D. Stormwater is routed into the treatment wetland for phosphorus removal by plant and sediment intake. It overlies a highly permeable surficial groundwater aquifer. Strong surface water and groundwater interactions are a key component of the hydrologic processes. The site has extensive field measurement and monitoring that provide point scale and distributed data on surface water levels, groundwater levels and physical range of hydraulic parameters and hydrologic fluxes. Previous hydrologic and hydrodynamic modeling studies have treated seepage losses empirically by some simple regression equations and only surface water flows are modeled in detail. Several years of operational data are available and were used in model calibration and validation. The validity of diffusion wave approximation for 2-D overland flow in the region with very flat topography was also tested. The uniqueness of this modeling study includes (1) the point scale and distributed comparison of model results with observed data; for example, the spatial distribution of measured vertical flux in the wetland is available. (2) Model parameters are based on available field test data. (3) Water flows in the study area consist of 2-D overland flow, hydraulic structures/levees, 3-D subsurface flow and 1- D canal flow and their interactions. This study demonstrates the need and the utility of a physics-based modeling approach for strong surface water and groundwater interactions.