Model Calibration and Validation of South Florida ...

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

Model Calibration and Validation of South Florida Biscayne Bay Coastal Wetlands Watershed
Paper
Author:Hwai-Ping Cheng <hwai-ping.cheng@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
Hsin-Chi Lin <hsin-chi.j.lin@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
Charles Tate <charles.h.tate@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
Earl Edris <earl.v.edris@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
David Richards <david.r.richards@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
Mitch Granat <mitch.a.granat@erdc.usace.army.mil> (US Army Corps of Engineers, the Jacksonville District)
Presenter:David Richards <david.r.richards@erdc.usace.army.mil> (US Army Engineer Research and Development Center)
Date: 2006-06-18     Track: General Sessions     Session: General
DOI:10.4122/1.1000000512
DOI:10.4122/1.1000000513

Among the 40 projects in the Florida Comprehensive Everglade Restoration Plan, the Biscayne Bay Coastal Wetlands (BBCW) project has a purpose of re-hydrating wetlands and reducing point source discharge to Biscayne Bay. Seven project alternatives that include rule-controlled coastal canal structures, rule-controlled pump stations, spreader swales, stormwater treatment areas, flowways, levees, culverts, roads, and backfilling canals have been proposed to achieve the purpose. These alternatives are evaluated with the WASH123D model-a first-principle, physics-based numerical model that computes flow and transport in a watershed system that is conceptualized as a combination of 1-D channel network, 2-D overland regimes, and 3- D subsurface media. The WASH123D-BBCW model needs to be calibrated and validated before being used to evaluate the alternatives. This paper presents the calibration and validation of the model. A three-step approach that is used for model calibration and validation is presented, discussed, and evaluated in this paper. The three steps are: calibration of the overland Manning’s roughness coefficients (n2) and subsurface hydraulic conductivities (K) with the coupled 2- D/3-D WASH123D-BBCW model where the historical data of canal stage is used as the boundary condition; calibration of the canal Manning’s roughness coefficients (n1) where the calibrated n2 and K from the previous step are used; and validation of the calibrated n1, n2, and K with a second set of historical data. The calibration- validation results of the WASH123D-BBCW model are also presented in the paper.