Twenty-three unsolved problems in hydrology (UPH) – a community perspective
Creators: name: Blöschl, Günter
name: Bierkens, Marc F.P.
name: Chambel, Antonio
name: Cudennec, Christophe
name: Destouni, Georgia
name: Fiori, Aldo
name: Kirchner, James W.
name: McDonnell, Jeffrey J.
name: Savenije, Hubert H.G.
name: Sivapalan, Murugesu
name: Stumpp, Christine
name: Toth, Elena
name: Volpi, Elena
name: Carr, Gemma
name: Lupton, Claire
name: Salinas, Josè
name: Széles, Borbála
name: Viglione, Alberto
name: Aksoy, Hafzullah
name: Allen, Scott T.
name: Amin, Anam
name: Andréassian, Vazken
name: Arheimer, Berit
name: Aryal, Santosh K.
name: Baker, Victor
name: Bardsley, Earl
name: Barendrecht, Marlies H.
name: Bartosova, Alena
name: Batelaan, Okke
name: Berghuijs, Wouter R.
name: Beven, Keith
name: Blume, Theresa
name: Bogaard, Thom
name: de Amorim, Pablo Borges
name: Böttcher, Michael E.
name: Boulet, Gilles
name: Breinl, Korbinian
name: Brilly, Mitja
name: Brocca, Luca
name: Buytaert, Wouter
name: Castellarin, Attilio
name: Castelletti, Andrea
name: Chen, Xiaohong
name: Chen, Yangbo
name: Chen, Yuanfang
name: Chifflard, Peter
name: Claps, Pierluigi
name: Clark, Martyn P.
name: Collins, Adrian L.
name: Croke, Barry
name: Dathe, Annette
name: David, Paula C.
name: de Barros, Felipe P. J.
name: de Rooij, Gerrit
name: Di Baldassarre, Giuliano
name: Driscoll, Jessica M.
name: Duethmann, Doris
name: Dwivedi, Ravindra
name: Eris, Ebru
name: Farmer, William H.
name: Feiccabrino, James
name: Ferguson, Grant
name: Ferrari, Ennio
name: Ferraris, Stefano
name: Fersch, Benjamin
name: Finger, David
name: Foglia, Laura
name: Fowler, Keirnan
name: Gartsman, Boris
name: Gascoin, Simon
name: Gaume, Eric
name: Gelfan, Alexander
name: Geris, Josie
name: Gharari, Shervan
name: Gleeson, Tom
name: Glendell, Miriam
name: Bevacqua, Alena Gonzalez
name: González-Dugo, María P.
name: Grimaldi, Salvatore
name: Gupta, A. B.
name: Guse, Björn
name: Han, Dawei
name: Hannah, David
name: Harpold, Adrian
name: Haun, Stefan
name: Heal, Kate
name: Helfricht, Kay
name: Herrnegger, Mathew
name: Hipsey, Matthew
name: Hlaváčiková, Hana
name: Hohmann, Clara
name: Holko, Ladislav
name: Hopkinson, Christopher
name: Hrachowitz, Markus
name: Illangasekare, Tissa H.
name: Inam, Azhar
name: Innocente, Camyla
name: Istanbulluoglu, Erkan
name: Jarihani, Ben
name: Kalantari, Zahra
name: Kalvans, Andis
name: Khanal, Sonu
name: Khatami, Sina
name: Kiesel, Jens
name: Kirkby, Mike
name: Knoben, Wouter
name: Kochanek, Krzysztof
name: Kohnová, Silvia
name: Kolechkina, Alla
name: Krause, Stefan
name: Kreamer, David
name: Kreibich, Heidi
name: Kunstmann, Harald
name: Lange, Holger
name: Liberato, Margarida L. R.
name: Lindquist, Eric
name: Link, Timothy
name: Liu, Junguo
name: Loucks, Daniel Peter
name: Luce, Charles
name: Mahé, Gil
name: Makarieva, Olga
name: Malard, Julien
name: Mashtayeva, Shamshagul
name: Maskey, Shreedhar
name: Mas-Pla, Josep
name: Mavrova-Guirguinova, Maria
name: Mazzoleni, Maurizio
name: Mernild, Sebastian
name: Misstear, Bruce Dudley
name: Montanari, Alberto
name: Müller-Thomy, Hannes
name: Nabizadeh, Alireza
name: Nardi, Fernando
name: Neale, Christopher
name: Nesterova, Nataliia
name: Nurtaev, Bakhram
name: Odongo, Vincent O.
name: Panda, Subhabrata
name: Pande, Saket
name: Pang, Zhonghe
name: Papacharalampous, Georgia
name: Perrin, Charles
name: Pfister, Laurent
name: Pimentel, Rafael
name: Polo, María J.
name: Post, David
name: Sierra, Cristina Prieto
name: Ramos, Maria-Helena
name: Renner, Maik
name: Reynolds, José Eduardo
name: Ridolfi, Elena
name: Rigon, Riccardo
name: Riva, Monica
name: Robertson, David E.
name: Rosso, Renzo
name: Roy, Tirthankar
name: Sá, João H.M.
name: Salvadori, Gianfausto
name: Sandells, Mel
name: Schaefli, Bettina
name: Schumann, Andreas
name: Scolobig, Anna
name: Seibert, Jan
name: Servat, Eric
name: Shafiei, Mojtaba
name: Sharma, Ashish
name: Sidibe, Moussa
name: Sidle, Roy C.
name: Skaugen, Thomas
name: Smith, Hugh
name: Spiessl, Sabine M.
name: Stein, Lina
name: Steinsland, Ingelin
name: Strasser, Ulrich
name: Su, Bob
name: Szolgay, Jan
name: Tarboton, David
name: Tauro, Flavia
name: Thirel, Guillaume
name: Tian, Fuqiang
name: Tong, Rui
name: Tussupova, Kamshat
name: Tyralis, Hristos
name: Uijlenhoet, Remko
name: van Beek, Rens
name: van der Ent, Ruud J.
name: van der Ploeg, Martine
name: Van Loon, Anne F.
name: van Meerveld, Ilja
name: van Nooijen, Ronald
name: van Oel, Pieter R.
name: Vidal, Jean-Philippe
name: von Freyberg, Jana
name: Vorogushyn, Sergiy
name: Wachniew, Przemyslaw
name: Wade, Andrew J.
name: Ward, Philip
name: Westerberg, Ida K.
name: White, Christopher
name: Wood, Eric F.
name: Woods, Ross
name: Xu, Zongxue
name: Yilmaz, Koray K.
name: Zhang, Yongqiang
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Molecular Biology
subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: 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.