Identificación E Inventario De Potenciales Glaciares Rocosos Activos en Los Pirineos Mediante Fotointepretación en Visores Cartográficos 2d Y 3d: Primeros Resultados

Roca, Josep Ventura

doi:10.18002/pol.v0i28.4289

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…Flutes occupy the external slope of the lateral moraine, with a gradient of 17º, and are composed of till. They have continuity with the moraine complex, formed by big boulders in hollows and arcs that have been interpreted as a possible rock glacier (García-Ruiz et al, 2014;Ventura, 2016). We interpret the discontinuous and poorly defined morainic arcs, with a chaotic topography and linked with the flutes, as a possible fast flow from the main Marboré glacier.…”

Section: The Marboré Lia Complexmentioning

confidence: 75%

Surge glaciers during the Little Ice Age in the Pyrenees

Cañadas

Moreno

2018

CIG

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Historical moraine complexes and erosional features are interesting elements to discern the historical climate changes and evolution, with a complex chronologies that help us to understand the dynamics and glacier evolution during the Little Ice Age (LIA). The existence of landforms as crevasses-squeeze ridges, hummocky moraines and flutes, related to different glacier advances and retreats, allows understanding in a better way the LIA glacier evolution in the Pyrenees. The aim of this work is to show how many LIA moraine complexes have traces of fast flow ice; when the surge dynamic happened; his extent and the environmental meaning. Based on glacier landsystem analysis we have established a work hypothesis on the fast flow or surge dynamic glaciers during the LIA, with geomorphological features, as flutes and push and hummocky moraines, at least in 17 LIA glacier complexes. The analysis of morphosquences by fieldwork, photo interpretation and historical sources in 8 selected LIA moraine complexes have been compared with previous climatic reconstructions creating a hypothesis about the response of the LIA glaciers to the short time changes in temperature and moisture.The glacier cirques with fast flow features are found in the highest mountains with summits above 3000 m., mainly northern oriented (88%) and without a significant lithology. The studied complexes (Central Infierno, Eastern Infierno, Oulettes de Gaube, Monte Perdido, Marboré, La Paúl, Literola and Tempestades) show 4 morphological units: a frontal moraine system (U1); a more voluminous moraine (U2); a little push and hummocky moraines complex linking with flutes (U3); and minor arcs up valley (U4). The U3 belongs to a fast flow stage or surging and by morphostratigraphy we can point out that the surge processes were produced between 1820 and 1840, at the end of the LIA. We related it with a possible climatic response to sudden cooling and the increase of winter precipitation with melt-water availability and quick ice melting during the summer, generating hydrodynamic changes in the small glaciers and quick dynamic response.

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Section: The Marboré Lia Complexmentioning

confidence: 75%

Surge glaciers during the Little Ice Age in the Pyrenees

Cañadas

Moreno

2018

CIG

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“…33 In the 21st century periglacial processes are still monitored using geomatic techniques and detailed analysis of the activity and distribution of active rock glaciers and permafrost. [34][35][36][37][38][39][40][41][42][43][44] Synthetic mapping on a regional scale (1:300,000 36 ) uses permafrost indicators (rock glaciers, gelifluction, ice caves, frost mounds, vertical electric soundings and thermal ground recordings), digital terrain models and modeling of basic parameters (mean annual air temperature [MAAT], aspect, slope) that determine the presence of permafrost using the classification of possible or probable permafrost. These studies established that permafrost was possible above 2,400m a.s.l.…”

mentioning

confidence: 99%

Periglacial environments and frozen ground in the central Pyrenean high mountain area: Ground thermal regime and distribution of landforms and processes

Cañadas

Blasco

Gómez‐Lende

et al. 2019

Permafrost & Periglacial

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The periglacial belt is located in the highest parts of temperate mountains. The balance between mean air and ground temperatures and the presence of water determine the effectiveness of periglacial processes related to permafrost, the active layer or seasonally frozen ground (SFG). This study combines thermal and geomorphological data obtained in four Pyrenean massifs (Infierno‐Argualas, Posets, Maladeta and Monte Perdido) to improve knowledge on the occurrence and distribution of frozen ground. The methodology used is based on the study of landforms as frozen ground indicators, mapping processes, ground temperature analysis, basal temperature of snow, thermal mapping and geomatic surveys on rock glaciers and protalus lobes. In the Pyrenean high mountain areas the lower limit of frozen ground is at ~2,650m a.s.l., possible permafrost appears above 2,650m a.s.l. on north‐ and south‐facing slopes, and probable permafrost is dominant above 2,900m a.s.l. Unfrozen ground with cold‐associated geomorphological processes reach 2,900m a.s.l. and unfrozen and frozen ground distribution points to a patchy pattern throughout the periglacial belt. The most widespread frozen grounds are SFG. The thermal data, mean annual ground temperature, cold season temperatures, bottom temperature snow measurements, freeze/thaw cycles and distribution of landforms permit the establishment of a periglacial land system divided into three main belts: infraperiglacial, middle periglacial and supraperiglacial. The large number of processes and landforms that are involved and their altitudinal and spatial organization make up a complex environment that determines the geoecological dynamics of high mountain areas.

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“…P R E -P R I N T V E R S I O N pulsaciones frías; d) la posible coexistencia en el Tardiglaciar de glaciares rocosos junto a pequeños glaciares de circo; y e) la probable actividad actual de los situados en las cotas más elevadas. Ventura (2016) indica la potencial actividad de algunos glaciares rocosos y lóbulos protalud en la zona, con sus frentes a >2.500 m al pie de paredes activas en los picos más elevados y en orientaciones N. en un inventario de glaciares rocosos y lóbulos protalud en los valles de Boí y Aran los incluye en tres generaciones, asociadas al proceso de deglaciación masiva entre el final del Último Máximo Glaciar (UMG) y el Holoceno.…”

Section: Antecedentesunclassified

“…los macizos más altos (>2800 m) de Certascan, Pica d'Estats y Monteixo-Medacorba, con frentes a >2500 m (Ventura, 2016(Ventura, , 2017. En estos macizos durante la PEH se generaron escasos núcleos glaciares (Mont Valier, Pica d'Estats), siendo aquí una fase eminentemente periglaciar.…”

Section: P a P E R A C C E P T E D P R E -P R I N T V E R S I O Nunclassified

“…Para Serrano y Agudo (2004), Serrano et al (2011) y Serrano (2014) los actuales glaciares rocosos activos de los Pirineos tienen dos edades, los más pequeños (como el del Coll de Bassiero en el valle de la Bonaigua) estarían originados en la PEH y los más extensos serian anteriores (dentro del Holoceno medio y tardío, entre 6.0 y 2.5 ka) reactivándose en el curso de la PEH y permaneciendo aún activos en la actualidad. En relación a la detección y cuantificación de actividad en estas nuevas geoformas inventariadas (Ventura, 2016), recientemente Bataller (2019) detecta movimientos verticales (subsidencia de magnitud decimétrica) en 6 glaciares rocosos al comparar sucesivos modelos digitales de elevación de alta resolución (datos LIDAR) en los macizos de Besiberri-Montardo y Punta Alta-Colomèrs, muy cercanos al valle de la Bonaigua. Esta subsidencia puede atribuirse a la degradación del permafrost presente en el interior de los glaciares rocosos.…”

Section: P a P E R A C C E P T E D P R E -P R I N T V E R S I O Nunclassified

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Distribución espacial y temporal de glaciares, glaciares cubiertos y glaciares rocosos durante la última deglaciación en el valle de La Bonaigua (Pirineo Central)

Ventura-Roca

2020

CIG

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The application of the paleogeographic method to the study of glacial landforms and rock glaciers allows their morphometric and sedimentological characterization, the establishment of a detailed morphostratigraphic sequence and a chronological proposal for the identified glacial phases. This study analyzes 86 landforms (57 glacial deposits, 21 rock glaciers and 8 protalus ramparts) in the Bonaigua Valley (Noguera Pallaresa Basin, Central Pyrenees), with special attention to the differentiation between debris-covered glaciers and rock glaciers. Other subjects studied concerning rock glaciers are: distinguish its glacial or periglacial origin; the possible current activity of some landforms, and the detection of rock glaciers located at low altitudes (in the current forest environment) through the use of high-resolution digital elevation model (2x2 m) from LIDAR data. The chronological hypothesis elaborated by correlation with other high Pyrenean valleys (with absolute ages available) includes 7 phases (6 glacial phases and 1 periglacial phase) in which co-exist and/or evolve, in a paraglacial dynamic, glaciers, debris-covered glaciers and rock glaciers, and that we temporarily place between the end of the Oldest Dryas and the Little Ice Age.

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Identificación E Inventario De Potenciales Glaciares Rocosos Activos en Los Pirineos Mediante Fotointepretación en Visores Cartográficos 2d Y 3d: Primeros Resultados

Cited by 5 publications

References 13 publications

Surge glaciers during the Little Ice Age in the Pyrenees

Surge glaciers during the Little Ice Age in the Pyrenees

Periglacial environments and frozen ground in the central Pyrenean high mountain area: Ground thermal regime and distribution of landforms and processes

Distribución espacial y temporal de glaciares, glaciares cubiertos y glaciares rocosos durante la última deglaciación en el valle de La Bonaigua (Pirineo Central)

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