Progress in flash flood observations, modelling and forecasting, with uncertainty estimation through innovative observation concepts and improved process understanding will be the main focus of this Session. In particular, methods are sought to deal with short lead times and limited data availability involved in flash flood risk governance. The session will also focus on innovative techniques for extreme precipitation estimation and now-casting at small space-time scales, observations and modelling of rainfall-runoff dynamics and geomorphological processes during flash flood events. The social impacts of these floods is also of great importance, thus we also seek contributions from specialists in vulnerability assessment. A final theme is the risk governance of future flash floods, which will require consideration under climate and land use changes.



Contributions could cover:

i) use of radar, lightning, satellite and storm tracking monitoring for rainfall estimation and nowcasting during extreme events;

ii) use of findings from post-event field campaigns for inference of runoff peaks and timing at multiple sites on the river network, and methods for interpretation of these data;

iii) use of remote sensing, real-time modelling and in-situ measurements to estimate soil moisture at the onset on an event;

iv) analysis of the atmospheric and hydrologic controls on flash flooding, change of dominant process types with flood severity, threshold values and their relation to catchment characteristics;

v) geomorphological processes and sediment dynamics during flash-flood events;

vi) analysis of flash flood vulnerability including space-time frameworks for societal impacts;

vii) application of the above concepts in flash flood risk governance.

The Session will be under HS as the main, and coordinated with NH, AS and Geomorphology.