HS1.2.1 | PICO

The International Association of Hydrological Sciences (IAHS), in collaboration with the Hydrology Divisions of EGU and AGU as well as the IAH, have recently called for compiling a list of unsolved scientific problems in hydrology that would invigorate research in the 21st century. In a public consultation process, a large number of potential science questions were collated, prioritised and synthesised, which resulted in a set 23 Unsolved Problems in Hydrology (UPH) (see https://doi.org/10.1080/02626667.2019.1620507).

The UPH are articulated around 7 themes: Time variability and change, Space variability and scaling, Variability of extremes, Interfaces in hydrology, Measurements and data, Modelling methods, and Interfaces with society. Some of the UPH may have already been partially studied. Recent research may shed light on how to move forward in a more holistic way. A crucial issue is to put together fragmented knowledge to address the questions raised and enhance coherence in hydrological sciences.

The purpose of this session is to discuss progress in any of the 23 UPH. Contributions are encouraged to either:
• present research results that advance the understanding of any of the 23 UPH,
• review (or present a contribution to review) the state of the art of one (or more) of the UPH, pointing towards directions where progress is most promising.

Authors are asked to clearly state the UPH their work refers to or could contribute to solve. The authors may also reflect on how the community could evaluate if an UPH can be considered solved or not.

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Co-sponsored by AGU, IAH, and IAHS
Convener: Elena Toth | Co-conveners: Berit Arheimer, Günter Blöschl, Christophe Cudennec, Maria-Helena Ramos
The International Association of Hydrological Sciences (IAHS), in collaboration with the Hydrology Divisions of EGU and AGU as well as the IAH, have recently called for compiling a list of unsolved scientific problems in hydrology that would invigorate research in the 21st century. In a public consultation process, a large number of potential science questions were collated, prioritised and synthesised, which resulted in a set 23 Unsolved Problems in Hydrology (UPH) (see https://doi.org/10.1080/02626667.2019.1620507).

The UPH are articulated around 7 themes: Time variability and change, Space variability and scaling, Variability of extremes, Interfaces in hydrology, Measurements and data, Modelling methods, and Interfaces with society. Some of the UPH may have already been partially studied. Recent research may shed light on how to move forward in a more holistic way. A crucial issue is to put together fragmented knowledge to address the questions raised and enhance coherence in hydrological sciences.

The purpose of this session is to discuss progress in any of the 23 UPH. Contributions are encouraged to either:
• present research results that advance the understanding of any of the 23 UPH,
• review (or present a contribution to review) the state of the art of one (or more) of the UPH, pointing towards directions where progress is most promising.

Authors are asked to clearly state the UPH their work refers to or could contribute to solve. The authors may also reflect on how the community could evaluate if an UPH can be considered solved or not.