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| Sensitivity Analysis of Hydrological and Water Quality Parameters of HSPF Model |
| Received:March 01, 2014 |
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| KeyWord:parameter sensitivity;HSPF model;hydrological and water quality simulation;perturbation analysis method |
| Author Name | Affiliation | E-mail | | LUO Chuan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LI Zhao-fu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | lizhaofu@njau.edu.cn | | XI Qing | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | PAN Jian-jun | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| Model sensitivity analysis measures the variability of output variables caused by perturbations in parameter values and input data. It is important for parameter selection, model calibration, and model improvement. As one of the integrated watershed model, HSPF(Hydrological Simulation Program-Fortran) model has a lot of parameters related to the physical characteristics of local watershed. In order to ascertain the sensitive parameters for hydrology and water quality simulation of HSPF model, a typical small watershed in the Taihu Lake hilly region was used as a case study. Perturbation method was employed to evaluate the sensitivity of parameters of hydrology, sediment and N and P transportation modules. It was found that seven of 17 selected parameters in the hydrology module were sensitive. The sensitive level of UZSN, INFILT, and AGWRC was Type Ⅲ, while that of LZSN, DEEPFR, INTFW, and IRC Type Ⅱ. Of nine parameters for the pervious surface of sediment, the sensitive level of KSER, KGER and JGER was Type Ⅲ, and JSER Type Ⅳ. Among the four parameters for impervious surface, the sensitive level of KEIM, JEIM and ACCSDP was Type Ⅲ. The reach parameters KSAND and EXPSND had Type Ⅲ sensitivity, while TAUCS and TAUCD had Type Ⅱ sensitivity. In selected 23 parameters for nitrogen simulation module, WSQOP, SQOLIM, MON-GRND-CONC were Type Ⅳ, KATM20 and MON-IFLW-CONC Type Ⅲ, and TCNIT, PHYSET and MALGR Type Ⅱ sensitive. Phosphorus module had 12 parameters, of which MON-GRND-CONC was Type Ⅲ and MON-POTFW, MON-IFLW-CONC, MALGR, and PHYSET Type Ⅱ sensitive parameters. These results would be useful for selection of sensitive parameters for hydrology and water quality simulation used for HSPF model, especially for small hilly watersheds in the Taihu Lake area. |
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