Abstract
Parameter uncertainty involved in hydrological and sediment modeling often refers to the parameter dispersion and the sensitivity of the parameter. However, a limitation of the previous studies lies in that the assignment of range and specification of probability distribution for each parameter is usually difficult and subjective. Therefore, there is great uncertainty in the process of parameter calibration and model prediction. In this study, the impact of probability parameter distribution on hydrological and sediment modeling was evaluated using a semi-distributed model—the Soil and Water Assessment Tool (SWAT) and Monte Carlo method (MC)—in the Daning River watershed of the Three Gorges Reservoir Region (TGRA), China. The classic types of parameter distribution such as uniform, normal and logarithmic normal distribution were involved in this study. Based on results, parameter probability distribution showed a diverse degree of influence on the hydrological and sediment prediction, such as the sampling size, the width of 95% confidence interval (CI), the ranking of the parameter related to uncertainty, as well as the sensitivity of the parameter on model output. It can be further inferred that model parameters presented greater uncertainty in certain regions of the primitive parameter range and parameter samples densely obtained from these regions would lead to a wider 95 CI, resulting in a more doubtful prediction. This study suggested the value of the optimized value obtained by the parameter calibration process could may also be of vital importance in selecting the probability distribution function (PDF). Such cases, where parameter value corresponds to the watershed characteristic, can be used to provide a more credible distribution for both hydrological and sediment modeling.
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Acknowledgments
The study was supported by National Science Foundation for Distinguished Young Scholars (No. 51025933), Program for Changjiang Scholars and Innovative Research Team in University (No. IRT0809) and the Nonprofit Environment Protection Specific Project (No. 200709024). The authors wish to express their gratitude to the editor of Stochastic Environmental Research and Risk Assessment, as well as to anonymous reviewers who helped to improve this paper though their thorough review.
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Zhenyao, S., Lei, C. & Tao, C. The influence of parameter distribution uncertainty on hydrological and sediment modeling: a case study of SWAT model applied to the Daning watershed of the Three Gorges Reservoir Region, China. Stoch Environ Res Risk Assess 27, 235–251 (2013). https://doi.org/10.1007/s00477-012-0579-8
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DOI: https://doi.org/10.1007/s00477-012-0579-8