Table 1

Physical meanings and units of Xinanjiang model parameters

ParameterPhysical descriptionUnit
Runoff generating parameter
K Ratio of potential evapotranspiration to pan evaporation –
Um Averaged soil moisture storage capacity of the upper layer mm
Lm Averaged soil moisture storage capacity of the lower layer mm
Dm Averaged soil moisture storage capacity of the deep layer mm
C Coefficient of the deep layer that depends on the proportion of the basin area covered by vegetation with deep roots –
B Exponential parameter with a single parabolic curve, which represents the nonuniformity of the spatial distribution of the soil moisture storage capacity over the catchment –
Im Percentage of impervious and saturated areas in the catchment –
Runoff routing parameter
Sm Areal mean free water capacity of the surface soil layer, which represents the maximum possible deficit of free water storage mm
Ex Exponent of the free water capacity curve influencing the development of the saturated area –
10 Kg Outflow coefficients of the free water storage to groundwater relationships –
11 Ki Outflow coefficients of the free water storage to interflow relationships –
12 Ci Recession constants of the lower interflow storage –
13 Cg Recession constants of the groundwater storage –
ParameterPhysical descriptionUnit
Runoff generating parameter
K Ratio of potential evapotranspiration to pan evaporation –
Um Averaged soil moisture storage capacity of the upper layer mm
Lm Averaged soil moisture storage capacity of the lower layer mm
Dm Averaged soil moisture storage capacity of the deep layer mm
C Coefficient of the deep layer that depends on the proportion of the basin area covered by vegetation with deep roots –
B Exponential parameter with a single parabolic curve, which represents the nonuniformity of the spatial distribution of the soil moisture storage capacity over the catchment –
Im Percentage of impervious and saturated areas in the catchment –
Runoff routing parameter
Sm Areal mean free water capacity of the surface soil layer, which represents the maximum possible deficit of free water storage mm
Ex Exponent of the free water capacity curve influencing the development of the saturated area –
10 Kg Outflow coefficients of the free water storage to groundwater relationships –
11 Ki Outflow coefficients of the free water storage to interflow relationships –
12 Ci Recession constants of the lower interflow storage –
13 Cg Recession constants of the groundwater storage –
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