Technical Note: Testing an improved index for analysing storm discharge–concentration hysteresis

Charlotte E M Lloyd, Jim E Freer, Penny J Johnes, A. L. Collins

Research output: Contribution to journalArticle (Academic Journal)

44 Citations (Scopus)
522 Downloads (Pure)


Analysis of hydrochemical behaviour during storm events can provide new insights into the process controls on nutrient transport in catchments. The examination of storm behaviours using hysteresis analysis has increased in recent years, partly due to the increased availability of high temporal resolution data sets for discharge and water quality parameters. A number of these analyses involve the use of an index to describe the characteristics of a hysteresis loop in order to compare storm behaviours both within and between catchments. This technical note reviews the methods for calculation of the hysteresis index (HI) and explores a new more effective methodology. Each method is systematically tested and the impact of the chosen calculation on the results is examined. Recommendations are made regarding the most effective method of calculating a HI which can be used for comparing data between storms and between different water quality parameters and catchments.
Original languageEnglish
Pages (from-to)625-632
Number of pages8
JournalHydrology and Earth System Sciences
Issue number2
Early online date4 Feb 2016
Publication statusPublished - Feb 2016

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