DOI: 10.5194/hess-22-4583-2018
论文题名: Technical note: Pitfalls in using log-transformed flows within the KGE criterion
作者: Santos L. ; Thirel G. ; Perrin C.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 8 起始页码: 4583
结束页码: 4591
语种: 英语
Scopus关键词: Earth sciences
; Hydrology
; Flow variability
; Heteroscedasticity
; Logarithmic transformations
; Low flow
; Model performance
; Performance criterion
; Technical notes
; Water balance
; Efficiency
; discharge
; efficiency measurement
; low flow
; modeling
; numerical method
; pitfall trap
; underpinning
英文摘要: Log-transformed discharge is often used to calculate performance criteria to better focus on low flows. This prior transformation limits the heteroscedasticity of model residuals and was largely applied in criteria based on squared residuals, like the Nash-Sutcliffe efficiency (NSE). In the recent years, NSE has been shown to have mathematical limitations and the Kling-Gupta efficiency (KGE) was proposed as an alternative to provide more balance between the expected qualities of a model (namely representing the water balance, flow variability and correlation). As in the case of NSE, several authors used the KGE criterion (or its improved version KGE′) with a prior logarithmic transformation on flows. However, we show that the use of this transformation is not adapted to the case of the KGE (or KGE′) criterion and may lead to several numerical issues, potentially resulting in a biased evaluation of model performance. We present the theoretical underpinning aspects of these issues and concrete modelling examples, showing that KGE′ computed on log-transformed flows should be avoided. Alternatives are discussed. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163211
Appears in Collections: 气候变化与战略
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作者单位: Santos, L., Irstea, HYCAR Research Unit, 1 rue Pierre-Gilles de Gennes, Antony, 92160, France; Thirel, G., Irstea, HYCAR Research Unit, 1 rue Pierre-Gilles de Gennes, Antony, 92160, France; Perrin, C., Irstea, HYCAR Research Unit, 1 rue Pierre-Gilles de Gennes, Antony, 92160, France
Recommended Citation:
Santos L.,Thirel G.,Perrin C.. Technical note: Pitfalls in using log-transformed flows within the KGE criterion[J]. Hydrology and Earth System Sciences,2018-01-01,22(8)