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Multi‐method global sensitivity analysis (MMGSA) for modelling floodplain hydrological processes

Cloke, H. L., Pappenberger, F. and Renaud, J.-P. (2008) Multi‐method global sensitivity analysis (MMGSA) for modelling floodplain hydrological processes. Hydrological Processes, 22 (11). pp. 1660-1674. ISSN 0885-6087

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To link to this item DOI: 10.1002/hyp.6734

Abstract/Summary

When studying hydrological processes with a numerical model, global sensitivity analysis (GSA) is essential if one is to understand the impact of model parameters and model formulation on results. However, different definitions of sensitivity can lead to a difference in the ranking of importance of the different model factors. Here we combine a fuzzy performance function with different methods of calculating global sensitivity to perform a multi-method global sensitivity analysis (MMGSA). We use an application of a finite element subsurface flow model (ESTEL-2D) on a flood inundation event on a floodplain of the River Severn to illustrate this new methodology. We demonstrate the utility of the method for model understanding and show how the prediction of state variables, such as Darcian velocity vectors, can be affected by such a MMGSA. This paper is a first attempt to use GSA with a numerically intensive hydrological model.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Walker Institute
Faculty of Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Interdisciplinary centres and themes > Soil Research Centre
Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:37909
Uncontrolled Keywords:global sensitivity analysis; sensitivity measures; floodplain hydrology; finite element; ESTEL-2D; hydrological processes; fuzzy performance; Darcian velocity
Publisher:Wiley InterScience

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