Dinámica y peligrosidad de las corrientes de derrubios: aplicación en el barranco de erill, pirineo catalán
- Autores: Carles Raimat Quintana
- Directores de la Tesis: Jordi Corominas i Dulcet (dir. tes.), Marcel Hürlimann Ziegler (dir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2018
- Idioma: español
- Tribunal Calificador de la Tesis: Gloria Furdada Bellavista (presid.), Jose Moya Sánchez (secret.), Olga-christina Mavrouli (voc.)
- Programa de doctorado: Programa de Doctorado en Ingeniería del Terreno por la Universidad Politécnica de Catalunya
- Materias:
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- Resumen
Debris flows are one of the most dangerous mass movements in mountainous regions, but with many outstanding issues on hydrologicalcondilions, mechanisms triggering,dynamic flow and mitigation measures.
This work in the Erill Torren!(Vall de Boí- Lleida) aims to deepen the knowledge of hydrologic conditions of generation and dynamics of basin-scale debris flows .This has been essential to auscultation and the capture of old records and surveys, a curren! and historically active basin,with glacial deposits.
The monitoring system consists of meteorologicalstation,5 piezometers to characterize the full thickness of the glacier deposit, geophones in flow channel, load cells in the interception flow system and 2 cameras, in addition to the system of autonomous power, recording and e-connectivity of the whole.
The rainfall combined with the piezometric allows correlation and piezometric stage prior to the generating terrain destabilization of debris flows . Geophones measurement combined with hourly precipitation allow correlate accumulated rain and flow intensity al the same time combined with filming and load cells allows to distinguish between types of signals and flow parameters.
Between 2007 and 2012, any auscultated events exceeded the 2500m 3 of material,however, the collection of historical data of the twentieth century shows events ofvolumes > 75,000 m3.The combined analysis ofthe historical and auscultated values allows you to generate a relationship between magnitude and frequency ,in different time pages. To Have pictures of old events has also allowed determine the usefulness of the RAMMS software.
Applying the objectivity of the ROC method on auscultates hourly precipitation values ,shown as the accum ulation > 12 mm 2 and 12 h, and taking the historical series daily values of > 47 mm in 72 h points as best indicator, both could be considered criteria for EWS in debris flows for this basin.
Piezometric auscultation of glacial deposit combined with hourly rainfall data has allowed lo better understand the dynamics of infiltration and possible conditions of the stress state limit. Any auscultated event has been preceded piezometric extreme conditions, so any auscultated events coincided with an episode of rain that added to a previous load stadium of the hydrological system justified the debris flow .But a basic hydrological model and a model of stability by FLAC, which responds lo the hydrological conditions corresponding to the dates of historicalevents is has been able to generate.
The study suggests that the auscultates events are result of channel remobilizations or surface instabilities and in any case derived from a global instability.
The interception VX system is assumed to be as efficient method,having intercepted 7 debris flows and a total volume of 3000 m3 with dynamic and static loads like !hose obtained in llgraben (Switzerland) test Site.The system can be used as mitigation for debris of short and medium return period debris flows.
