Research Article
Impact of Direct Soil Moisture and Revised Soil Moisture Index Methods on Hydrologic Predictions in an Arid Climate
Table 2
Sensitivity ranking of parameters for SMI and SMCII methods derived by SUFI-2 algorithm.
| | Parameter | Sensitivity rank | |
SMI |
SMCII |
| | Effective hydraulic conductivity of main channel | 1 | 1 | | Base flow alpha factor | — | 2 | | SCS runoff curve number for mixing grassland and shrub land based on SMI/SMCII | 2 | 4 | | Manning coefficient for channel | 3 | 11 | | SCS runoff curve number for shrub land based on SMI/SMCII | 4 | 3 | | Surface runoff lag coefficient | 5 | 7 | | Maximum canopy index for mixing grassland shrub-land for SMI/maximum canopy index for SMCII | 6 | 10 | | Threshold depth of water in the shallow aquifer required for return flow to occur | 7 | 8 | | Reach of evaporation coefficient | 8 | — | | Threshold depth of water in the shallow for percolation to the deep aquifer for SMI/groundwater recharge to deep aquifer for SMCII | 9 | 12 | | Plant evaporation compensation factor | 10 | — | | Soil available water capacity | 11 | 5 | | Soil conductivity | 12 | 9 | | Deep aquifer percolation fraction | 13 | — | | Soil evaporation compensation factor | 14 | 6 |
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