Intense rainfall and/or orographic precipitation events in small and medium size catchments can trigger flash floods, which are characterized by very short response times and high specific peak discharges. Under appropriate topographic conditions, such rainstorms also cause debris flows or shallow landslides mobilizing large amounts of unconsolidated material. Although significant progress has been made in the last decade in the management of flash floods related risks, these events remain poorly understood and their predictability is limited by a high non-linearity in the hydrological response, related to threshold effects and structured heterogeneity at all scales. In addition, predicting the initiation and runout of rainfall-induced landslides and their interactions with hydrological and hydraulic processes is still affected by large uncertainties. Therefore, improving the flash floods understanding, forecasting and risk management capacities requires multi-disciplinary approaches, as well as innovative measurements and modelling approaches as these events often occur in ungauged basins.

This session welcomes contributions illustrating current advances and approaches in monitoring, modelling, forecasting and warning flash floods and associated geomorphic processes. Contributions documenting the societal responses and impacts, and analysing risk management systems are also welcome. The session will cover the following main scientific themes:
- Development of new measurement techniques adapted to flash floods monitoring and quantification of the associated uncertainties
- Use of remote sensing data, weather radar, and lightning for improving forecasting models input data
- Development of modelling tools for predicting and forecasting flash floods and/or rainfall-induced landslides in gauged and ungauged basins
- Use of new criteria such as specific “hydrological signatures” for model and forecast evaluation
- Identification of processes leading to flash flood events and/or rainfall-induced landslides from data analysis and/or modelling, and of their characteristic space-time scales
- Evolutions in flash-flood characteristics possibly related to changing climate.
- Observation, understanding and prediction of the social vulnerability and social response to flash floods and/or associated landsliding
- Flash flood and/or rainfall-induced landslide risk assessment using multi-disciplinary approaches and warning systems, and evaluation of the relevance of those systems.

Co-organized as NH1.32
Convener: Olivier Payrastre | Co-conveners: Isabelle Braud, Jonathan Gourley, Marcel Hürlimann, Massimiliano Zappa
| Thu, 11 Apr, 16:15–18:00
Room 2.25
| Attendance Thu, 11 Apr, 14:00–15:45
Hall A

Attendance time: Thursday, 11 April 2019, 14:00–15:45 | Hall A

Chairperson: Isabelle Braud
A.45 |
Paul Muñoz, Johanna Orellana-Alvear, Patrick Willems, and Rolando Célleri
A.49 |
Guillaume Artigue, Anne Johannet, Valérie Borell, and Séverin Pistre
A.50 |
Daniela Peredo Ramirez, Maria Helena Ramos, Vazken Andréassian, Ludovic Oudin, and Nicolas Le Moine
A.51 |
Fabian von Trentini, Florian Willkofer, Johannes Mitterer, Markus Disse, and Ralf Ludwig
A.52 |
Davide Zoccatelli, Francesco Marra, James Smith, David Goodrich, Carl Unkrich, and Efrat Morin
A.53 |
Thanh Thi Luong, Stefan Wiemann, Judith Lorenz, Rico Kronenberg, and Christian Bernhofer
A.55 |
Paul Krenn, Stefanie Peßenteiner, Joachim Götz, Silke Lutzmann, Gottfried Kirchengast, and Oliver Sass
A.56 |
Multiple effects of intense meteorological events in the Benevento Province, southern Italy
Paola Revellino, Luigi Guerriero, Francesco Fiorillo, and Francesco Maria Guadagno
A.57 |
Sofia Sarchani, Konstantinos Seiradakis, Helena Flocas, and Ioannis Tsanis
A.58 |
Emmanouil Andreadakis, Michalis Diakakis, Efthymios Nikolopoulos, Emmanuel Vassilakis, and Nafsika-Ioanna Spyrou
A.59 |
| presentation
Thomas Pflugbeil, Karl Broich, and Markus Disse
A.62 |
A Rapid Flood Risk assessment based on satellite images
Hani Ali, Florient Aubry, Vincent Feraud, and Emmanuel Delafosse
A.63 |
Estimation of extreme floods by dendro-chronological investigations in Mediterranean mountain torrents
Giuseppe Bombino, Daniela D'Agostino, Pietro Denisi, Labate Antonino, Demetrio Antonio Zema, and Santo Marcello Zimbone