Advances in Meteorology / 2016 / Article / Tab 4

Research Article

Improving the Distributed Hydrological Model Performance in Upper Huai River Basin: Using Streamflow Observations to Update the Basin States via the Ensemble Kalman Filter

Table 4

The sensitive parameters in SWAT for rainfall-runoff modeling and their standard deviation (SD) of Gaussian multiplicative error in streamflow assimilation.

ParametersUnitsDescriptionLevelSD of GME

CN2Initial SCS runoff curve number for moisture condition IIHRU0.05
ESCOSoil evaporation compensation factorHRU0.2
ALPHA_BFDaysBaseflow recession constantHRU0.2
GW_REVAPGround “revap” coefficientHRU0.2
GWQMNmmThreshold depth of water in the shallow aquifer required for return flow to occurHRU0.2
REVAPMNmmThreshold depth of water in the shallow aquifer for “revap” or percolation to the deep aquifer to occurHRU0.2
OV_NManning’s “” value for overland flowHRU0.1
SOL_AWCmm/mmAvailable water capacity of the soil layerHRU    0.2
CH_N()Manning’s “” values for the tributary channelsHRU0.2
CH_N()Manning’s “” values for the main channelSubbasin0.2
SURLAGSurface runoff lag coefficientBasin0.2

Note: is the number of soil layers on profile in a hydrologic response unit (HRU); SD represents standard deviation; GME represents Gaussian multiplicative error.

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