Flow Regime-Dependent, Discharge Uncertainty Envelope for Uncertainty Analysis with Ensemble Methods

Uncertainty and uncertainty analysis methods

Stochastic uncertainty analysis for unconfined flow systems

[1] A new stochastic approach proposed by Zhang and Lu (2004), called the Karhunen-Loeve decomposition-based moment equation (KLME), has been extended to solving nonlinear, unconfined flow problems in randomly heterogeneous aquifers. This approach is on the basis of an innovative combination of Karhunen-Loeve decomposition, polynomial expansion, and perturbation methods. The random logtransform...

Graphical Methods for Uncertainty and Sensitivity Analysis

Graphical methods play an important role in SA, since they provide a means of visualizing the relationships between the output and input factors. However, in complex problems, with many input variables, the problem of constructing useful graphical presentations becomes challenging, and the types of solutions become more varied. This chapter presents a number of familiar and perhaps not so famil...

An educational model for ensemble streamflow simulation and uncertainty analysis

This paper presents the hands-on modeling toolbox, HBV-Ensemble, designed as a complement to theoretical hydrology lectures, to teach hydrological processes and their uncertainties. The HBV-Ensemble can be used for inclass lab practices and homework assignments, and assessment of students’ understanding of hydrological processes. Using this modeling toolbox, students can gain more insights into...

Methods : Uncertainty

Glossary adjustment theory: the theory of errors in survey measurements frequentist: holding to the view that probability must be defined through experiment, as a proportion of events fuzzy set: a set defined by membership in a specific class, with membership allowed to be partial Gaussian (or Normal) distribution: a description of the relative sizes of errors in repeated measurements, a mathem...