Identification of appropriate temporal scales of dominant low flow indicators in the Main River, Germany

M.C. Demirel, Martijn J. Booij

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Abstract

Models incorporating the appropriate temporal scales of dominant indicators for low flows are assumed to perform better than models with arbitrary selected temporal scales. In this paper, we investigate appropriate temporal scales of dominant low flow indicators: precipitation (P), evapotranspiration (ET) and the standardized groundwater storage index (G). This analysis is done in the context of low flow forecasting with a lead time of 14 days in the Main River, a tributary of the Rhine River, located in Germany. Correlation coefficients (i.e. Pearson, Kendall and Spearman) are used to reveal the appropriate temporal scales of dominant low flow indicators at different time lags between low flows and indicators and different support scales of indicators. The results are presented for lag values and support scales, which result in correlation coefficients between low flows and dominant indicators falling into the maximum 10% percentile range. P has a maximum Spearman correlation coefficient (ρ) of 0.38 (p = 0.95) at a support scale of 336 days and a lag of zero days. ET has a maximum ρ of –0.60 (p = 0.95) at a support scale of 280 days and a lag of 56 days and G has a maximum ρ of 0.69 (p = 0.95) at a support scale of 7 days and a lag of 3 days. The identified appropriate support scales and lags can be used for low flow forecasting with a lead time of 14 days.
Original languageEnglish
Title of host publicationProceedings of the Sixth World FRIEND Conference, 25-29 October 2010, Fez, Morocco
EditorsEric Servat, Siegfried Demuth, Alain Dezetter, Trevor Daniell
PublisherIAHS Press
Pages538-543
Number of pages704
ISBN (Print)9781907161131
Publication statusPublished - 25 Oct 2010

Publication series

NameIAHS publication
PublisherIAHS Press
Number340
ISSN (Print)0144-7815

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Keywords

  • rank correlation
  • support scale
  • Time lag
  • Low flows
  • Main River
  • Germany
  • IR-78687
  • standardized groundwater storage index
  • METIS-271673

Cite this

Demirel, M. C., & Booij, M. J. (2010). Identification of appropriate temporal scales of dominant low flow indicators in the Main River, Germany. In E. Servat, S. Demuth, A. Dezetter, & T. Daniell (Eds.), Proceedings of the Sixth World FRIEND Conference, 25-29 October 2010, Fez, Morocco (pp. 538-543). (IAHS publication; No. 340). IAHS Press.