Recent debris flows in the Portainé catchment (Eastern Pyrenees, Spain): analysis of monitoring and field data focussing on the 2015 event

Palau, Rosa M.; Hürlimann, Marcel; Pinyol, Jordi; Moya, José; Victoriano, Ane; Génova, Mar; Puig-Polo, Càrol

doi:10.1007/s10346-017-0832-9

Cited by 14 publications

(11 citation statements)

References 21 publications

(18 reference statements)

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“…On the other hand, in the 21 August 2015 torrential event, the sediment entrained in the Portainé stream (Table 2) was mostly retained by the flexible barriers [18]. Thus, unloading of the flow produced erosion downstream in the lower reach of Caners, with the outcropping of ancient sediments ( Figure 1) that had been covered by younger torrential deposits.…”

Section: Former Evidence Of Geomorphological Disequilibriummentioning

confidence: 99%

“…Thus, the problem should not be considered exclusively by a single discipline, but in the wider context, by looking at relationships as a whole. Consequently, our approach is based on our previous, specifically focussed works carried out with different methods and with conclusive proofs and results [12][13][14][15][16][17][18][19][20][21][22] and also considers the complexity of the system as suggested by Kondolf and Piégay [23], by working with the convergence of evidence. From this scope, this paper integrates and synthesizes the results of multidisciplinary research carried out in the basin of Portainé, as only through this holistic approach can the hypothetical surpassing of the geomorphic threshold after flood events be detected and characterized.…”

Section: The Geomorphological Threshold Conceptmentioning

confidence: 99%

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Flood Consequences of Land-Use Changes at a Ski Resort: Overcoming a Geomorphological Threshold (Portainé, Eastern Pyrenees, Iberian Peninsula)

Furdada

Victoriano

Díez‐Herrero

et al. 2020

Water

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The sensitive mountain catchment of Portainé (Eastern Pyrenees, Iberian Peninsula) has recently experienced a significant change in its torrential dynamics due to human disturbances. The emplacement of a ski resort at the headwaters led to the surpassing of a geomorphological threshold, with important consequences during flood events. Consequently, since 2008, channel dynamics have turned into sediment-laden, highly destructive torrential flows. In order to assess this phenomenon and o acquire a holistic understanding of the catchment’s behaviour, we carried out a field work-based multidisciplinary study. We considered the interaction of the various controlling factors, including bedrock geology, geomorphological evolution, derived soils and coluvial deposits, rainfall patterns, and the hydrological response of the catchment to flood events. Moreover, anthropogenic land-use changes, its consequential hydrogeomorphic effects and the role of vegetation were also taken into account. Robust sedimentological and geomorphological evidence of ancient dense debris flows show that the basin has shifted around this threshold, giving rise to two different behaviours or equilibrium conditions throughout its history: alternating periods of moderate, bedload-laden flows and periods of high sediment-laden debris flow dynamics. This shifting could have extended through the Holocene. Finally, we discuss the possible impact of climate and global change, as the projected effects suggest future soil and forest degradation; this, jointly with more intense rainfalls in these mountain environments, would exacerbate the future occurrence of dense sediment-laden flows at Portainé, but also in other nearby, similar basins.

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Section: Former Evidence Of Geomorphological Disequilibriummentioning

confidence: 99%

Section: The Geomorphological Threshold Conceptmentioning

confidence: 99%

Flood Consequences of Land-Use Changes at a Ski Resort: Overcoming a Geomorphological Threshold (Portainé, Eastern Pyrenees, Iberian Peninsula)

Furdada

Victoriano

Díez‐Herrero

et al. 2020

Water

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“…The Portainé catchment has an area of 2.50 km . Two debris flow events affected a secondary road and a small dam located downstream, one occurred on the 22 of July 2010 with a mobilized volume of 25000 m 3 , and a smaller one on 12 August 2010 (Palau et al 2017). The Santa Maria is a 1.70 km 2 catchment located in the mountain of Montserrat.…”

Section: Validation In Specific Sitesmentioning

confidence: 99%

“…Jakob and Hungr 2005;Froude and Petley 2018). Although these phenomena are not as widely reported in Catalonia (NE Spain) as they are in other regions, their hazard is still significant (Gallart and Clotet 1988;Portilla et al 2010a;Hürlimann et al 2014;Palau et al 2017). Rainfalls that trigger shallow slides and debris flows are frequently rather short and intense (Guzzetti et al 2008;Alfieri et al 2012;Abancó et al 2016) and its frequency is expected to increase due to climate change (Gariano and Guzzetti 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of the mapping unit for regional landslide early warning systems: comparison between pixels and polygons in Catalonia (NE Spain)

et al. 2020

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This work presents a prototype Landslide Early Warning System (LEWS) adapted to real-time performance over the region of Catalonia (NE Spain). The system uses high-resolution rainfall information obtained from weather radar observations and susceptibility maps to issue a qualitative warning level at a regional scale. To study the influence of the mapping unit on the LEWS outputs, susceptibility maps obtained for Catalonia based on (i) pixels of different sizes and (ii) hydrological subbasins have been compared. The susceptibility has been derived using a simple fuzzy logic approach combining slope angle and land cover data. The susceptibility maps for the different mapping units have then been employed to run the LEWS for a period of 7 months (warm season of 2010). For each configuration, the performance, interpretability of the warnings and, computational requirements have been compared to assess the suitability of each mapping unit for their use in the LEWS in real time. The configuration using pixels of 30 m resolution as mapping units seems to be the best as a compromise between resolution, performance and computational cost. However, from an end-user's real-time perspective the interpretation of the warnings can be difficult. Therefore, summarizing and visualizing the warnings, which are computed over the highresolution grid, by subbasins is proposed as the best option.

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“…Figure 4 shows the stations from which data have been used in this work. Original data have been used (both from https://www.meteo.cat/observacions/ xema, with point-selective daily data from June 2009 to the present, and from MeteoPirineu) and data cited in the works by Palau, et al, (2017), Trapero, et al, (2013a and Bech, et al, (2011). Palau, et al, (2017 take precipitation values from various meteorological stations in a detailed study of the 21/Aug./2015 event.…”

Section: Documentary Geomorphological and Instrumental Datamentioning

confidence: 99%

Evidencias dendrogeomorfológicas de inundaciones en la cuenca alta del río Noguera Pallaresa (Pirineos, España)

Génova,

Furdada,

Guinau

2023

pirineos

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Las zonas montañosas son propensas a inundaciones torrenciales que se caracterizan por su capacidad de movilizar grandes volúmenes de sedimentos y otros materiales como troncos y otras piezas de madera de gran tamaño. En el caso de la cuenca alta del río Noguera Pallaresa (Pirineos de Lleida, España), las principales inundaciones destructivas están bien identificadas y descritos sus principales parámetros, pero aún falta el detalle espacial y temporal de éstos y otros eventos menos severos. Con el objetivo de ampliar la información sobre los efectos de estas inundaciones, este trabajo analiza y compara diferentes fuentes de datos, a partir de muestreos dendrogeomorfológicos realizados en dos afluentes del río Noguera Pallaresa: el río Flamisell (en el margen derecho) y el río Romadriu (en el margen izquierdo). La datación de los principales indicadores dendrogeomorfológicos en ambos afluentes, especialmente cicatrices y cambios bruscos de crecimiento, así como las fechas estimadas de establecimiento de los árboles, se han contrastado con datos de fuentes documentales, geomorfológicas, meteorológicas e hidrológicas. Se ha comprobado que, en estas pequeñas y medianas subcuencas, con precipitaciones muy heterogéneas a causa de la orografía, los datos instrumentales (a menudo muy escasos) pueden no reflejar adecuadamente la dinámica hidrológica. Por tanto, se constata que el análisis de las fuentes dendrogeomorfológicas y documentales es fundamental para caracterizar y evaluar la incidencia de estas inundaciones torrenciales en diferentes ámbitos territoriales.

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Recent debris flows in the Portainé catchment (Eastern Pyrenees, Spain): analysis of monitoring and field data focussing on the 2015 event

Cited by 14 publications

References 21 publications

Flood Consequences of Land-Use Changes at a Ski Resort: Overcoming a Geomorphological Threshold (Portainé, Eastern Pyrenees, Iberian Peninsula)

Flood Consequences of Land-Use Changes at a Ski Resort: Overcoming a Geomorphological Threshold (Portainé, Eastern Pyrenees, Iberian Peninsula)

Influence of the mapping unit for regional landslide early warning systems: comparison between pixels and polygons in Catalonia (NE Spain)

Evidencias dendrogeomorfológicas de inundaciones en la cuenca alta del río Noguera Pallaresa (Pirineos, España)

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