The Scientific World Journal / 2014 / Article / Tab 3

Research Article

Assessment of the Impacts of Land Use Changes on Nonpoint Source Pollution Inputs Upstream of the Three Gorges Reservoir

Table 3

List of sensitive parameters calibrated and ranges and values of major parameters used.

NameDescriptionRangeOptimum valueSensitivity
MinMax

SDNCO1Denitrification threshold water content0.908 0.987 0.974 0
PPERCO2Phosphorus percolation coefficient (10 m3/Mg)14.578 14.770 14.674 0.02
RSDCO3rsCoefficient for mineralization of the residue fresh organic nutrients0.052 0.086 0.070 0.14
PHOSKD4Phosphorus soil partitioning coefficient 128.810 133.328 131.069 0.17
BC45 Local rate constant for organic phosphorus mineralization at 20°PHC (day−1)0.267 0.283 0.277 0.21
ERORGP6Phosphorus enrichment ratio1.913 1.929 1.928 0.23
BC17Rate constant for biological oxidation of ammonia nitrogen at 20°C (day−1)0.116 0.128 0.121 0.23
GWSOLP8Concentration of soluble phosphorus in groundwater contribution to streamflow from subbasin (ppm). 0.134 0.152 0.152 0.24
USLE_K9Soil erodibility factor (0.013 metric ton m2 hr/(m3-metric ton cm))5.752 6.963 6.600 0.25
CMN10Rate coefficient for mineralization of the humus active organic nutrients0.001 0.001 0.001 0.26
SHALLST11Initial depth of water in the shallow aquifer (mm H2O)2.773 2.992 2.989 0.42
USLE_C12Minimum value for the cover and management factor0.028 0.036 0.032 0.67
GW_DELAY13Delay time for aquifer recharge (days)1.584 1.670 1.608 0.71
SPEXP14Exponent in sediment transport equation1.270 1.270 1.270 0.81
ERORGN15Organic nitrogen enrichment ratio1.926 1.930 0.154 0.9
REVAPMN16Threshold water level in shallow aquifer for revap or percolation to deep aquifer (mm H2O)282.438 291.261 286.850 0.94
NPERCO17Nitrate percolation coefficient0.583 0.609 0.596 0.95
CH_K18Effective hydraulic conductivity in main channel alluvium54.074 55.028 54.551 0.98

aSuperscripts of each parameter are their corresponding orders from the sensitivity analysis.