气候变化领域集成服务门户(CCPortal): Technical note: Pitfalls in using log-transformed flows within the KGE criterion

CCPortal

DOI	10.5194/hess-22-4583-2018
	Technical note: Pitfalls in using log-transformed flows within the KGE criterion
	Santos L.; Thirel G.; Perrin C.
发表日期	2018
ISSN	1027-5606
起始页码	4583
结束页码	4591
卷号	22 期号:8
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.
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159928
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
推荐引用方式 GB/T 7714	Santos L.,Thirel G.,Perrin C.. Technical note: Pitfalls in using log-transformed flows within the KGE criterion[J],2018,22(8).
APA	Santos L.,Thirel G.,&Perrin C..(2018).Technical note: Pitfalls in using log-transformed flows within the KGE criterion.Hydrology and Earth System Sciences,22(8).
MLA	Santos L.,et al."Technical note: Pitfalls in using log-transformed flows within the KGE criterion".Hydrology and Earth System Sciences 22.8(2018).