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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water resources and hydroinformatics : Comparison of the pawn and sobolĄŻ sensitivity analysis methods for a highly-parameterizedhydrologic...
Comparison of the pawn and sobolĄŻ sensitivity analysis methods for a highly-parameterizedhydrological model using swat
Author : FARKHONDEH KHORASHADI ZADEH (1), FANNY SARRAZIN (2), JIRI NOSSENT (1,3), FRANCESCA PIANOSI (2), ANN VAN GRIENSVEN (1,4), THORSTEN WAGENER (2,5) & WILLY BAUWENS (1
ABSTRACT
The high number of parameters is a major problem for complex environmental models as it restricts their application.
Therefore, sensitivity analysis (SA) methods, that aim to identify the influential and the non-influential parameters of a
model, can be essential for an efficient calibration of these models. The SA indeed allows for a reduction of the number of
parameters involved in a calibration procedure, by applying factor fixing (FF) and factor prioritization (FP). In this paper, a
density-based Global Sensitivity Analysis (GSA) method -PAWN- is applied to the Soil and Water Assessment Tool
(SWAT), a highly-parameterized hydrological simulator. The objective of this study is to compare the newly developed
PAWN method with the SobolĄŻ method, which is a well-established and widely used variance-based SA method. The
PAWN method considers the entire model output distribution to describe the output uncertainty while the SobolĄŻ method
implicitly assumes that the variance is a sufficient indicator for this purpose. To this end, 26 water quantity related
parameters of a SWAT model of the River Zenne (Belgium) are selected to be ranked, using both the PAWN and the
SobolĄŻ methods. In addition, the two SA methods are evaluated and compared in terms of convergence, the related
evolution of the parameter ranking results and required computation cost
File Size : 169,474 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water resources and hydroinformatics
Date Published : 20/08/2015
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