The Scientific World Journal / 2014 / Article / Tab 7

Research Article

Improving the Performance of Temperature Index Snowmelt Model of SWAT by Using MODIS Land Surface Temperature Data

Table 7

Calibration parameters in Elev and New scenarios.

ParametersDefinitionMethodRange/percent

ALPHA_BFBase-flow alpha factor (days)V0-1
CN2Initial SCS CN II valueR±50%
ESCOSoil evaporation compensation factorV0.25–0.75
GW_DELAYGroundwater delay (days)V0–30
SFTMPSnowfall temperature (°C)V−5 to 5
SMTMPSnowmelt base temperature (°C)V−5 to 5
SMFMNMelt factor for snow on December 21 (mm H2O/°C-day)V0–3
SMFMXMelt factor for snow on June 21 (mm H2O/°C-day)V3–9
SNO50COVFraction of snow volume represented by SNOCOVMX that corresponds to 50% snow coverV0.01–0.99
SNOCOVMXMinimum snow water content corresponding to 100% snow cover (mm)V0–500
SOL_AWCAverage available waterR±50%
SOL_KSaturated conductivityR±50%
SURLAGSurface runoff lag time (days)V1–24
TIMPSnow pack temperature lag factor (°C)V0.01–1
TLAPSTemperature lapse rate changed with the elevation (°C)V−10 to 0

Elev scenario is elevation bands combined with the original monitoring air temperature data scenario, and New scenario is the newly created air temperature data. V means the true value of the parameter and R means the relative range of the original parameter.

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