Articles | Volume 22, issue 8
https://doi.org/10.5194/hess-22-4583-2018
https://doi.org/10.5194/hess-22-4583-2018
Technical note
 | 
30 Aug 2018
Technical note |  | 30 Aug 2018

Technical note: Pitfalls in using log-transformed flows within the KGE criterion

Léonard Santos, Guillaume Thirel, and Charles Perrin

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ED: Publish subject to minor revisions (further review by editor) (22 Aug 2018) by Bettina Schaefli
AR by Léonard Santos on behalf of the Authors (22 Aug 2018)  Author's response   Manuscript 
ED: Publish subject to technical corrections (23 Aug 2018) by Bettina Schaefli
AR by Léonard Santos on behalf of the Authors (23 Aug 2018)  Manuscript 
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Short summary
The Kling and Gupta efficiency (KGE) is a score used in hydrology to evaluate flow simulation compared to observations. In order to force the evaluation on the low flows, some authors used the log-transformed flow to calculate the KGE. In this technical note, we show that this transformation should be avoided because it produced numerical flaws that lead to difficulties in the score value interpretation.