Category Archives: science plan

What are the challenges for HEPEX over the next decade?

The question sounds grand and may be a bit difficult to give a simple answer to, but that was the question put forward to the participants at the HEPEX workshop in Melbourne in February. HEPEX was founded as an initiative … Continue reading

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Flash Floods in Europe: state-of-the-art and perspectives

Contributed by Eric Gaume What do we really understand about “flash floods”? This question motivated the presentation I gave in Vienna during the last EGU Assembly in the session: Flash floods and associated hazards: monitoring, forecasting, preparedness and coping strategies … Continue reading

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Final score of the 10th Anniversary HEPEX Workshop

Contributed by Maria-Helena Ramos, Fredrik Wetterhall, Andy Wood, JuttaThielen, Florian Pappenberger, Jan Verkade In these times of World Cup, you may have heard many times the key question: “So, who’s the winner?” At the end of the 10th Anniversary HEPEX … Continue reading

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The future of HEPEX: 100 years from now

Contributed by Florian Pappenberger and Maria-Helena Ramos Soon we will be celebrating 10 years of HEPEX and other posts have already highlighted what we have achieved. Our Science and Implementation plan also lists past achievements and looks into the immediate … Continue reading

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HEPEX 10 years ago: Did the vision come true?

Contributed by John Schaake and Roberto Buizza In December 2003, in our ‘Proposal for an International Hydrological Ensemble Prediction Experiment (HEPEX)’, we wrote that: ‘the main objective how HEPEX is to bring the international hydrological community together with the meteorological … Continue reading

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TIGGE and the multi-model approach in hydrology (a brief review)

The multi-model approach is well established and popular in hydrological forecasting and modelling. For example, Shamseldin et al. (1997) showed different methods of combining the output of different hydrological models and this HEPEX post raises a number of challenges of … Continue reading

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Research Projects!

Hydrological Ensemble Prediction is a relatively young research field with a large amount of opportunities and unexplored scientific topics (see Science and Implementation Plan). There are numerous research grants, research projects, fellowships and PhD/MSc thesis dealing with issues described in … Continue reading

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HEPEX-SIP Topic: Hydrologic data assimilation (2/2)

Contributed by Liu Yuqiong, Albrecht Weerts and Hamid Moradkhani The following challenges and research needs are based on the paper by Liu et al. (2012). The need for transitioning of hydrologic DA research into effective operations has become increasingly recognized … Continue reading

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HEPEX-SIP Topic: Hydrologic data assimilation (1/2)

Contributed by Albrecht Weerts, Liu Yuqiong and Hamid Moradkhani What is hydrologic data assimilation? Data assimilation is the process in which model and measurements are combined to provide, in the context of HEPEX, more accurate and reliable forecasts. The term … Continue reading

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HEPEX Science and Challenges: Verification of Ensemble Forecasts (4/4)

Contributed by James Brown and Julie Demargne What are the challenges and research needs in ensemble forecast verification? Scientific and operational verification challenges include: to ensure that hindcasting and verification is an integral and routine component of hydrometeorological and hydrologic … Continue reading

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