Debris flow hazard assessment by means of numerical simulations: implications for the Rotolon creek valley (Northern Italy)
- 90 Downloads
On 4th November 2010, a debris flow detached from a large debris cover accumulated above the lowermost portion of the Rotolon landslide (Vicentine Pre-Alps, NE Italy) and channelized in the valley below within the Rotolon Creek riverbed. Such event evolved into a highly mobile and sudden debris flow, damaging some hydraulic works and putting at high risk four villages located along the creek banks. A monitoring campaign was carried out by means of a ground based radar interferometer (GB-InSAR) to evaluate any residual displacement risk in the affected area and in the undisturbed neighbouring materials. Moreover, starting from the current slope condition, a landslide runout numerical modelling was performed by means of DAN-3D code to assess the impacted areas, flow velocity, and deposit distribution of the simulated events. The rheological parameters necessary for an accurate modelling were obtained through the back analysis of the 2010 debris flow event. Back analysis was calibrated with all of the available terrain data coming from field surveys and ancillary documents, such as topographic, geomorphological and geological maps, with pre- and post-event LiDAR derived DTMs, and with orthophotos. Finally, to identify new possible future debris flow source areas as input data for the new modelling, all the obtained terrain data were reanalysed and integrated with the GB-InSAR displacement maps; consequently, new simulations were made to forecast future events. The results show that the integration of the selected modelling technique with ancillary data and radar displacement maps can be a very useful tool for managing problems related to debris flow events in the examined area.
KeywordsDebris flow DAN-3D GB-InSAR Numerical modelling Deep Seated Gravitational Slope Deformation (DSGSD) Rotolon Creek
Unable to display preview. Download preview PDF.
The GB-InSAR data were acquired in the framework of the monitoring activity carried out in the post-emergency management coordinated by the Italian Civil Protection Department. The available DTMs and aerial photos were acquired by means of aerial LiDAR surveys on behalf of the Veneto Soil Defense Regional Directorate on 21st October 2010 (pre-event) and 23rd November 2010 (post-event), respectively.
- Altieri V, Colombo P, Dal Prà A (1994) Study for the evaluation of slope stability conditions and Rotolon creek valley located in the Upper Agno Valley in the munivipality of Recoaro Terme (Vicenza). Relazione Geologico–Geotecnica. Regione del Veneto Segreteria Regionale per il Territorio–Dipartimento Lavori Pubblici–Venezia 97. (In Italian).Google Scholar
- Barbieri G, De Zanche V, Di Lallo E, et al. (1980) Recoaro geological map. Memorie Scietà Geologica XXXIV Padova. pp 23–52. (In Italian).Google Scholar
- Bossi G, Crema S, Frigerio S, et al. (2015a) The Rotolon catchment early-warning system. In: Lollino G et al. (eds.), Engineering Geology for Society and Territory. Springer International Publishing 3: 91–95. DOI: 10.1007/978-3-319-09054-2_18Google Scholar
- Chow VT (1959) Open-Channel Hydraulics. McGraw-Hill, New York. p 465.Google Scholar
- Evans SG, Clague JJ (1992) Glacier-related hazards and climatic change. In proceeding of the world at risk: Natural hazards and climate change, AIP Conference, Boston, Massachusetts (USA), 4-16 Jan 1992. pp 48–60. DOI: 10.1063/1.43890Google Scholar
- McColl ST, Davies TRH, McSaveney MJ (2010) Glacier retreat and rock-slope stability: debunking debuttressing. Geologically active: delegate papers 11th Congress of the International Association for Engineering Geology and the Environment, Auckland, Aotearoa, New Zealand, 5-10 September 2010. pp 467–474.Google Scholar
- Fidolini F, Pazzi V, Frodella W, et al. (2015) Geomorphological characterization, monitoring and modeling of the Monte Rotolon complex landslide (Recoaro Terme, Italy). In: Lollino G (eds.), Engineering Geology for Society and Territory. Springer International Publishing. pp 1311–1315. DOI: 10.1007/978-3-319-09057-3_230CrossRefGoogle Scholar
- Hungr O, Evans SG (1996) Rock avalanche runout prediction using a dynamic model. In: Senneset K, Balkema AA (eds.). Proceedings of the 7th International Symposium on Landslides Trondheim Norway, 17-21 June 1996. Rotterdam, The Netherlands. pp 233–238.Google Scholar
- McDougall S (2006) A new continuum dynamic model for the analysis of extremely rapid landslide motion across complex 3D terrain. PhD thesis, University of British Columbia, Vancouver, British Columbia.Google Scholar
- Mizuyama T, Kobashi S, Ou G (1992) Prediction of debris flow peak discharge. In Proceedings of the International Symposium Interpraevent, Bern, Switzerland. pp 99–108.Google Scholar
- Morelli S, Salvatici T, Nolesini T, et al. (2016) Analogue and numerical modeling of the Stromboli hot avalanches. In: Aversa S, Cascini L, Picarelli L, Scavia C (eds.), Landslides and Engineered Slopes. Experience, Theory and Practice. Proceedings of the 12th International Symposium on Landslides, 12-19 June 2016, Napoli, Italy. CRC Press, Napoli, Italy. pp 1493–1500. DOI: 10.1201/b21520-184Google Scholar
- Rudolf H, Leva D, Tarchi D, et al. (1999) A mobile and versatile SAR system. In Proceeding of the Geoscience and Remote Sensing Symposium, 1999. IGARSS'99. IEEE 1999 International. pp 592–594. DOI: 10.1109/IGARSS.1999.773575Google Scholar
- Schneuwly-Bollschweiler M, Stoffel M, Rudolf-Miklau F (2012) Dating torrential processes on fans and cones: methods and their application for hazard and risk assessment. Springer Science & Business Media, Berlin, Heidelberg, New York, Vol. 47.Google Scholar
- Trivelli G (1991) History of the territory and inhabitants of Recoaro, in Recoaro Terme municipality. Istituto Geografico De Agostini. (In Italian)Google Scholar
- Voellmy A (1955) Uber die Zerstorunskraft von Lawinen (On breaking force of avalanches). Schweizerische Bauzeitung 73: 212–285. (In German)Google Scholar
- Yifru AL (2014) Assessment of Rheological Models for Run-out Distance Modeling of Sensitive Clay Slides, Focusing on Voellmy Rheology. Master of Science thesis, Norwegian University of Science and Technology.Google Scholar
- Zanchetta G, Sulpizio R, Pareschi MT, et al. (2004) Characteristics of May 5-6, 1998 volcaniclastic debris flows in the Sarno area (Campania, southern Italy): relationships to structural damage and hazard zonation. Journal of Volcanology and Geothermal Research 133 (1): 377–393. DOI: 10.1016/S0377-0273(03)00409-8CrossRefGoogle Scholar