HS2.4.7

Estimates of water availability and flooding risks remain one of the central scientific and societal challenges of the 21st century. The complexity of this challenge arises particularly from transient boundary conditions: Increasing atmospheric greenhouse gas concentrations lead to global warming and an intensification of the water cycle and finally to shifts in the temporal and spatial distribution of precipitation and terrestrial water availability. Likewise, large-scale land use changes impact and alter regional atmospheric circulation, thereby local precipitation characteristics and again terrestrial water availability. Also the feedbacks between the interlinked terrestrial and atmospheric processes on different spatial and temporal scales are still poorly understood.
This session therefore invites contributions addressing past, present and prospective changes in regional hydrological behaviour due to either (or joint) climate- and/or land use changes. We especially welcome contributions on the development of novel methods and methodologies to quantify hydrological change. Further aspects of this topic comprise particularly:

- Robustness of hydrological impact assessments based on scenarios using downscaled climate model – hydrology model modelling chains.
- Quantification of regional land use change predictions and impact of past, present and future land use changes on water and energy fluxes in meso- to large-scale catchments.
- Joint or coupled modelling of water and energy fluxes between the atmosphere and the land surface/subsurface and analyses of feedback mechanisms.
- Climate change/land use change signal separation techniques and quantification of future land use change vs. climate change induced hydrological change.
- Adequate handling of climate change and land use change data and their uncertainty for the forcing of hydrological models.
- Case studies of regional hydrological behaviour in climate sensitive and flood or drought prone regions worldwide.

Public information:
We as convenors decided to conduct a telecon/videocon via the BigBlueBottom system, which is hosted at a server of the University of Potsdam. Hence, the high data security standards of Germany are in effect on this server. Another advantage of this system is that it can be accessed via the browser so that you do not need to download any software. The necessary link is sent around to all session authors and can be requested from two of the convenors, Stefan Hagemann and Axel Bronstert. During the videocon, micros and cameras of attendees should be usually switched off. Micro and camera should only be switched on for the moderator and the presenter as well as for the one who is providing a comment or question.

To best organize our BBB session, we will carry out the one presentation (display) at the time.
Each presenter has 2 Min. to shortly present his display and may show 1 slide. Then, there will be 5 Min. time to discuss the corresponding display (Hence, displays should be looked at in advance).

Do not try to give a full presentation in these 2 Min., just give a SHORT introduction and highlight the main points. After this short introduction to the presentation, the floor is now open for comments.
If there are no comments, we will move to the next display. Hence, the timing for the sequence of displays to be presented is just a general sketch.

Currently, we have the confimation for 15 displays to be presented. Thus, instead of having two separate sessions on the original oral and poster presentations, we will have one BBB session starting at 8:30 Vienna time. The sequence of displays will be in accordance to their appearance in the EGU session programme
This will take about 2 hours.

Session time, Fr 8 May 2020, 8:30-11:00 (may be extended if more dislays are uploaded and presented)

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Convener: Stefan Hagemann | Co-conveners: Axel Bronstert, Harald Kunstmann, Rajib Maity
Displays
| Attendance Fri, 08 May, 08:30–12:30 (CEST)

Estimates of water availability and flooding risks remain one of the central scientific and societal challenges of the 21st century. The complexity of this challenge arises particularly from transient boundary conditions: Increasing atmospheric greenhouse gas concentrations lead to global warming and an intensification of the water cycle and finally to shifts in the temporal and spatial distribution of precipitation and terrestrial water availability. Likewise, large-scale land use changes impact and alter regional atmospheric circulation, thereby local precipitation characteristics and again terrestrial water availability. Also the feedbacks between the interlinked terrestrial and atmospheric processes on different spatial and temporal scales are still poorly understood.
This session therefore invites contributions addressing past, present and prospective changes in regional hydrological behaviour due to either (or joint) climate- and/or land use changes. We especially welcome contributions on the development of novel methods and methodologies to quantify hydrological change. Further aspects of this topic comprise particularly:

- Robustness of hydrological impact assessments based on scenarios using downscaled climate model – hydrology model modelling chains.
- Quantification of regional land use change predictions and impact of past, present and future land use changes on water and energy fluxes in meso- to large-scale catchments.
- Joint or coupled modelling of water and energy fluxes between the atmosphere and the land surface/subsurface and analyses of feedback mechanisms.
- Climate change/land use change signal separation techniques and quantification of future land use change vs. climate change induced hydrological change.
- Adequate handling of climate change and land use change data and their uncertainty for the forcing of hydrological models.
- Case studies of regional hydrological behaviour in climate sensitive and flood or drought prone regions worldwide.

Public information: We as convenors decided to conduct a telecon/videocon via the BigBlueBottom system, which is hosted at a server of the University of Potsdam. Hence, the high data security standards of Germany are in effect on this server. Another advantage of this system is that it can be accessed via the browser so that you do not need to download any software. The necessary link is sent around to all session authors and can be requested from two of the convenors, Stefan Hagemann and Axel Bronstert. During the videocon, micros and cameras of attendees should be usually switched off. Micro and camera should only be switched on for the moderator and the presenter as well as for the one who is providing a comment or question.

To best organize our BBB session, we will carry out the one presentation (display) at the time.
Each presenter has 2 Min. to shortly present his display and may show 1 slide. Then, there will be 5 Min. time to discuss the corresponding display (Hence, displays should be looked at in advance).

Do not try to give a full presentation in these 2 Min., just give a SHORT introduction and highlight the main points. After this short introduction to the presentation, the floor is now open for comments.
If there are no comments, we will move to the next display. Hence, the timing for the sequence of displays to be presented is just a general sketch.

Currently, we have the confimation for 15 displays to be presented. Thus, instead of having two separate sessions on the original oral and poster presentations, we will have one BBB session starting at 8:30 Vienna time. The sequence of displays will be in accordance to their appearance in the EGU session programme
This will take about 2 hours.

Session time, Fr 8 May 2020, 8:30-11:00 (may be extended if more dislays are uploaded and presented)

Session assets

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