Twenty-three unsolved problems in hydrology (UPH) – a community perspective

Gunter Bloschl 1 Marc Bierkens 2 Antonio Chambel 3 Christophe Cudennec 4 Georgia Destouni 5 Aldo Fiori 6 James Kirchner 7 Jeffrey Mcdonnell 8 Hubert Savenije 9 Murugesu Sivapalan 10 Christine Stumpp Elena Toth 11 Elena Volpi 6 Gemma Carr 1 Claire Lupton 12 Josè Salinas 1 Borbála Széles 1 Alberto Viglione 13 Hafzullah Aksoy 14 Scott Allen 7 Anam Amin 15 Vazken Andréassian 16 Berit Arheimer 17 Santosh Aryal Victor Baker Earl Bardsley Marlies Barendrecht Alena Bartosova Okke Batelaan Wouter Berghuijs Keith Beven Theresa Blume Thom Bogaard 18 Pablo Borges de Amorim Michael Böttcher Gilles Boulet 19 Korbinian Breinl Mitja Brilly Luca Brocca Wouter Buytaert 20 Attilio Castellarin 11 Andrea Castelletti Xiaohong Chen 21 Yangbo Chen 21 Yuanfang Chen 22 Peter Chifflard Pierluigi Claps Martyn Clark 23 Adrian Collins Barry Croke Annette Dathe Paula David Felipe de Barros Gerrit de Rooij Giuliano Di Baldassarre 24 Jessica Driscoll Doris Duethmann Ravindra Dwivedi Ebru Eris William Farmer James Feiccabrino Grant Ferguson Ennio Ferrari Stefano Ferraris Benjamin Fersch David Finger 25 Laura Foglia Keirnan Fowler Boris Gartsman Simon Gascoin 26 Eric Gaume 27 Alexander Gelfan 28 Josie Geris Shervan Gharari Tom Gleeson Miriam Glendell 29 Alena Gonzalez Bevacqua María González-Dugo Salvatore Grimaldi A. Gupta Björn Guse Dawei Han David Hannah 30 Adrian Harpold Stefan Haun Kate Heal Kay Helfricht Mathew Herrnegger Matthew Hipsey Hana Hlaváčiková Clara Hohmann Ladislav Holko Christopher Hopkinson Markus Hrachowitz 31 Tissa Illangasekare 32 Azhar Inam Camyla Innocente Erkan Istanbulluoglu Ben Jarihani Zahra Kalantari Andis Kalvans Sonu Khanal Sina Khatami Jens Kiesel Mike Kirkby Wouter Knoben Krzysztof Kochanek Silvia Kohnova 33 Alla Kolechkina Stefan Krause 30 David Kreamer Heidi Kreibich 34 Harald Kunstmann Holger Lange Margarida Liberato Eric Lindquist Timothy Link Junguo Liu 35 Daniel Loucks Charles Luce Gil Mahé 36 Olga Makarieva Julien Malard Shamshagul Mashtayeva Shreedhar Maskey 37 Josep Mas-Pla Maria Mavrova-Guirguinova Maurizio Mazzoleni Sebastian Mernild Bruce Dudley Misstear Alberto Montanari 38 Hannes Müller-Thomy Alireza Nabizadeh Fernando Nardi Christopher Neale Nataliia Nesterova Bakhram Nurtaev Vincent Odongo Subhabrata Panda Saket Pande Zhonghe Pang Georgia Papacharalampous Charles Perrin Laurent Pfister 39 Rafael Pimentel Maria Polo 40 David Post 41 Cristina Sierra Maria-Helena Ramos 16 Maik Renner José Reynolds Elena Ridolfi Riccardo Rigon Monica Riva 42 David Robertson 43 Renzo Rosso João Sá Gianfausto Salvadori Mel Sandells Bettina Schaefli Andreas Schumann Anna Scolobig Jan Seibert Eric Servat 36 Mojtaba Shafiei Ashish Sharma 44 Moussa Sidibe 45 Roy Sidle 46 Thomas Skaugen Hugh Smith Sabine Spiessl Lina Stein Ingelin Steinsland Ulrich Strasser Bob Su Jan Szolgay 33 David Tarboton 47 Marc F.P. Bierkens Hubert H.G. Savenije Daniel Peter Loucks Bruce Dudley Misstear Cristina Prieto Sierra José Eduardo Reynolds Tirthankar Roy João H.M. Sá Flavia Tauro Guillaume Thirel 16 Fuqiang Tian 48 Rui Tong Kamshat Tussupova Hristos Tyralis Remko Uijlenhoet 49 Rens van Beek 50 Ruud van der Ent Martine van der Ploeg Anne van Loon 30 Ilja van Meerveld Ronald van Nooijen Pieter van Oel Jean-Philippe Vidal 51 Jana von Freyberg Sergiy Vorogushyn 52 Przemyslaw Wachniew Andrew Wade 53 Philip Ward Ida Westerberg Christopher White Eric Wood 54 Ross Woods Zongxue Xu Koray Yilmaz Yongqiang Zhang
Abstract : This paper is the outcome of a community initiative to identify major unsolved scientific problems in hydrology motivated by a need for stronger harmonisation of research efforts. The procedure involved a public consultation through online media, followed by two workshops through which a large number of potential science questions were collated, prioritised, and synthesised. In spite of the diversity of the participants (230 scientists in total), the process revealed much about community priorities and the state of our science: a preference for continuity in research questions rather than radical departures or redirections from past and current work. Questions remain focused on the process-based understanding of hydrological variability and causality at all space and time scales. Increased attention to environmental change drives a new emphasis on understanding how change propagates across interfaces within the hydrological system and across disciplinary boundaries. In particular, the expansion of the human footprint raises a new set of questions related to human interactions with nature and water cycle feedbacks in the context of complex water management problems. We hope that this reflection and synthesis of the 23 unsolved problems in hydrology will help guide research efforts for some years to come.
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Gunter Bloschl, Marc Bierkens, Antonio Chambel, Christophe Cudennec, Georgia Destouni, et al.. Twenty-three unsolved problems in hydrology (UPH) – a community perspective. Hydrological Sciences Journal, Taylor & Francis, 2019, 64 (10), pp.1141-1158. ⟨10.1080/02626667.2019.1620507⟩. ⟨hal-02280747⟩

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