Drought Assessment by a Short-/Long-Term Composited Drought Index in the Upper Huaihe River Basin, China

Table 1

Calibrated parameters for the daily Xinanjiang model in upper Huaihe River above the Xixian station.

Parameters	Meaning	Values
KC	Ratio of potential evapotranspiration to pan evaporation	0.89
UM	Areal mean tension water capacity in the upper layer (mm)	28
LM	Areal mean tension water capacity in the lower layer (mm)	85
	Coefficient of deep evapotranspiration	0.167
WM	Areal mean tension water capacity (mm)	150
	Exponent of the tension water capacity curve	0.45
IM	Ratio of the impervious to the total area of the basin	0.001
SM	Areal mean of the free water capacity of the surface soil layer (mm)	15
EX	Exponent of the free water capacity curve	1.5
KG	Outflow coefficient of the free water storage to groundwater relationship	0.55
CS	Recession constant of surface water storage	0.62
CI	Recession constant of interflow water storage	0.85
CG	Recession constant of groundwater storage	0.998
	Lag time (d)	2
KE	Parameter of the Muskingum method	24
XE	Parameter of the Muskingum method	0.3