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Water Resources Management

, Volume 32, Issue 3, pp 969–984 | Cite as

Skill of Hydrological Extended Range Forecasts for Water Resources Management in Switzerland

  • Konrad BognerEmail author
  • Katharina Liechti
  • Luzi Bernhard
  • Samuel Monhart
  • Massimiliano Zappa
Article

Abstract

There is a growing need for reliable medium to extended range hydrological forecasts in water and environmental management (e.g. hydro-power and agricultural production). The objective of this paper is a first assessment of the skill of hydrological forecasts based on Numerical Weather Predictions (NWPs) in comparison to the skill of forecasts based on climatology for monthly forecasts with daily resolutions and to identify possibilities of improvement by post-processing the hydrological forecasts. Various hydrological relevant model variables, such as the surface and subsurface runoff and the soil water content, will be analysed for entire Switzerland. The spatially aggregated predictions of these variables are compared to daily simulations and to long-term daily averages of simulations driven by meteorological observations (i.e. climatology). Besides this comparison of forecasts with simulations for model variables without direct measurements available, the skill of the monthly stream-flow forecasts is estimated at four catchments with discharge measurements. Additionally post-processing methods have been applied to remove bias and dispersion errors and to estimate the predictive uncertainty of the stream-flow. Some results of various verification measures like variants of the Geometric Mean for ratios of spatial aggregates and the Continuous Rank Probability Skill Score (CRPSS) will be shown. Apart from the indication of a strong diversity of upper limits of the forecast skill depending on catchment characteristics, the results of NWPs are generally superior to climatological predictions and could be applied gainfully for various kinds of long-term water management planning.

Keywords

Ensemble forecasts Extended-range Skill score 

Notes

Acknowledgements

The application www.drought.ch is a product of the DROUGHT-CH project financed by Swiss National Research Programme on Sustainable Water Management (NRP 61). The operational demonstration of www.drought.ch has been financed by the Swiss Federal Office for Environment and supported by WSL and MeteoSwiss. Konrad Bogner’s contribution is part of the Swiss Competence Centre for Energy Research - Supply of Electricity (SCCER-SoE) and is funded by the Commission for Technology and Innovation (CTI). Samuel Monhart’s contribution is financed by the NRP 70 - Energy Turnaround project (Grant No. 407040_153929). The authors would like to thank especially Vanessa Round for proofreading.

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Swiss Federal Institute for Forest, Snow and Landscape Research WSLBirmensdorfSwitzerland

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