JWARP  Vol.9 No.1 , January 2017
Parameter Uncertainty Estimation by Using the Concept of Ideal Data in GLUE Approach
Abstract: The hydrological uncertainty about NASH model parameters is investigated and addressed in the paper through “ideal data” concept by using the Generalized Likelihood Uncertainty Estimation (GLUE) methodology in an application to the small Yanduhe research catchment in Yangtze River, China. And a suitable likelihood measure is assured here to reduce the uncertainty coming from the parameters relationship. “Ideal data” is assumed to be no error for the input-output data and model structure. The relationship between parameters k and n of NASH model is clearly quantitatively demonstrated based on the real data and it shows the existence of uncertainty factors different from the parameter one. Ideal data research results show that the accuracy of data and model structure are the two important preconditions for parameter estimation. And with suitable likelihood measure, the parameter uncertainty could be decreased or even disappeared. Moreover it is shown how distributions of predicted discharge errors are non-Gaussian and vary in shape with time and discharge under the single existence of parameter uncertainty or under the existence of all uncertainties.
Cite this paper: Zhu, J. and Du, H. (2017) Parameter Uncertainty Estimation by Using the Concept of Ideal Data in GLUE Approach. Journal of Water Resource and Protection, 9, 65-82. doi: 10.4236/jwarp.2017.91006.

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