Research Article
The Impact of US Biofuels Policy on Agricultural Production and Nitrogen Loads in Alabama
Table 1
Hydrological model calibration: parameters.
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CN2: initial Soil Conservation Service runoff curve number, function of land use, soil’s permeability, and previous soil water condition; ALPHA_BNK: baseflow alpha factor for bank storage (days); HRU_SLP: average slope steepness (m/m); precipitation: rainfall at monitoring point (mm); ESCO: soil evaporation compensation factor; GW_DELAY: groundwater delay time (days); RCHRG_DP: deep aquifer percolation fraction; GWQMN: threshold dept of water in shallow aquifers (mm H2O); EPCO: plant uptake compensation factor; SLSUBBSN: average slope length (m); CH_K(2): effective hydraulic conductivity (mm/hrs); ALPHA_BF: baseflow alpha factor (days); REVAPMN: threshold dept of shallow aquifers evaporation/deep aquifer percolation (mm H2O); CH_N(2): Manning’s roughness coefficient for channel flow; GW_REVAP: groundwater evaporation coefficient; CANMX: maximum canopy storage (mm H2O); SURLAG: surface runoff lag coefficient. ***99%, **95%, and *90% confidence intervals. aprobability of the t-statistic of the coefficients obtained by regressing the Latin hypercube parameters, generated during the calibration procedure and against the objective function values [23]; bminimum and maximum value of the HRU sample of parameters; cminimum and maximum value of measured and resampled precipitation at monitoring points; dthe fitted value is summed to one and multiplied by the default value (percentage change). |