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Hydrogeological parameters uncertainty is a major source of error in groundwater modeling.It is essential to analyze the effects of stochastic parameters uncertainty on predictinghydraulic heads and contaminant concentration. In this paper, a series of numericalexperiments were performed based on a groundwater numerical simulation to discuss theinfluence of parameters uncertainty on the prediction results. Hydrogeological parameterswith high sensitivity are identified by using local sensitivity analysis and taken as randomparameters. In order to analyze parameters uncertainty, the Markov chain Monte Carlomethod is used to select the groups of parameters which converge to the Bayesianposterior distribution. Then, the simulation results come out under different groups ofparameters which can show the distribution of hydraulic heads and contaminantconcentration, and the groundwater pollution risk at every point. It can providereference to groundwater resources evaluation and groundwater pollution control. [ABSTRACT FROM AUTHOR]

It is a conspicuous contradiction between sediment silting, flood control and water utilizationduring flood season for Naodehai Reservoir. Reservoir sediment silting and water level jointcontrol during flood season is in urgent need to study. As a basis for joint control, it isnecessary to study out flow water and sediment relations of the reservoir. In this paper, theauthors obtain practical achievement through the analysis to out flow water and sedimentrelation in different situation. The achievement sets the stage for the future water andsediment joint operation, at the same time; it provides the new thought for the similarproblem in domestic. [ABSTRACT FROM AUTHOR]