Abstract
A hydrologic model consists of several parameters which are usually calibrated based on observed hydrologic processes. Due to the uncertainty of the hydrologic processes, model parameters are also uncertain, which further leads to the uncertainty of forecast results of a hydrologic model. Working with the Bayesian Forecasting System (BFS), Markov Chain Monte Carlo simulation based Adaptive Metropolis method (AM-MCMC) was used to study parameter uncertainty of Nash model, while the probabilistic flood forecasting was made with the simulated samples of parameters of Nash model. The results of a case study shows that the AM-MCMC based on BFS proposed in this paper is suitable to obtain the posterior distribution of the parameters of Nash model according to the known information of the parameters. The use of Nash model and AM-MCMC based on BFS was able to make the probabilistic flood forecast as well as to find the mean and variance of flood discharge, which may be useful to estimate the risk of flood control decision.
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Foundation item: Under the auspices of National Natural Science Foundation of China (No. 50609005), Chinese Postdoctoral Science Foundation (No. 2009451116), Postdoctoral Foundation of Heilongjiang Province (No. LBH-Z08255), Foundation of Heilongjiang Province Educational Committee (No. 11451022)
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Xing, Z., Rui, X., Fu, Q. et al. Nash model parameter uncertainty analysis by AM-MCMC based on BFS and probabilistic flood forecasting. Chin. Geogr. Sci. 21, 74–83 (2011). https://doi.org/10.1007/s11769-010-0433-1
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DOI: https://doi.org/10.1007/s11769-010-0433-1