AUTOMATIC CALIBRATION OF A HYDROLOGIC MODEL FOR SIMULATING GROUNDWATER TABLE FLUCTUATIONS ON FARMS IN THE EVERGLADES AGRICULTURAL AREA OF SOUTH FLORIDA uri icon

abstract

  • The Shuffled Complex EvolutionUniversal Algorithm (SCE-UA) is an automatic calibration algorithm that has shown success in finding a globally optimum objective function with more efficiency than other methods. We incorporated the SCE-UA into our novel modeling environment, utilizing an ontology-based simulation (OntoSim-Sugarcane) framework adapted to analyze groundwater table (WT) fluctuations and drainage practices on four farm basins in the Everglades Agricultural Area of south Florida.
  • Utilizing two water years (WY96-97) of farm WT fluctuations observed at a portion (< 16 ha) of each farm basin, two parameterslateral hydraulic conductivities of soil profile and vertical hydraulic conductivity of underlying limestonewere automatically calibrated. Regardless of farms, the best parameter sets that minimize the objective function of daily root mean square error could be found after 1500 simulation runs. The quality of matching simulated to observed values of farm WT were further assessed by the Nash-Sutcliffe efficiency coefficient (NSE). The NSE ranged from 0.38 to 0.75 (calibration period, WY96-97) and 0.10 to 0.76 (validation period, WY98-99) on all four farms. These results indicate that this coupling strengthens the capability of OntoSim-Sugarcane to model hydrology by objectively finding the best parameter sets. Copyright (c) 2014 John Wiley & Sons, Ltd.

publication date

  • 2014
  • 2014