MESURES DE REMEDIACIÓ AMBIENTAL CONTRA ELS FENOMENS EROSIUS HÍDRICS ASSOCIAT...Fundació Marcel Chevalier
Poster per a la sessió Kick off del projecte SOLPYR (Poctefa 2023-2027) celebrada a Tremp el 29 i 30 d'abril.
Breu descipció: Al Juliol de 2015 una gran tempesta (de T~100 anys) va provocar una forta erosió a capçalera de conca, originant laves torrencials (debris flow) que amb el sediment exposat, a partir de llavors, inclusiva amb precipitacions mínimes (> 15 mm), es provocava aturades de la potabilitzadora d'aigües superficials que alimenta a Les Escaldes (15.000 hab.). Calia controlar l’enterboliment de l’aigua superficial.
Palaeoenvironmental changes in the Iberian central system during the Late-glacial and Holocene as inferred from geochemical data: A case study of the Navamuño depression in western Spain
Former cold-wet ice polythermal glaciers inferred from erratics and moraine's Schmidt Hammer ages at the Madriu valley, Principality of Andorra (SE- Pyrenees)
The document discusses research conducted on the Clot de la Menera rock glacier in northeastern Andorra. It includes details on field work conducted in Andorra, the geomorphology of the site, groundwater aquifers, anomalous spring water temperatures, apparent water ages from the coldest springs, electrical resistivity and NMR measurements taken with different sounding loops that revealed resistive surface layers and layers of high porosity at depths of 5 and 25 meters. The research analyzed the core nature and radioactive and stable isotopes within the rock glacier.
Mid-Late Pleistocene glacial dynamics in the Valira valleys (Principality of ...Fundació Marcel Chevalier
Many sediment-covered mountain areas affected by the growth of Pleistocene glaciers are over-consolidated. Palaeoglacial conditions are deduced from glacial consolidation and site investigations. Geomorphological evidence on the glacial extent and history is in this Thesis used as a framework for hydro-mechanical flow simulations in the valley glacier of Andorra and the lower Isère glaciated valley.
By classifying glacial phases of the northern Iberian Peninsula fringe, four common glacial phases arise for the last glacial cycle:
A) An early Glacial Cycle starting at MIS 5d having a recessional period during MIS 5c. Cold-type glaciers are expected to have existed in some of the extreme NW of the Iberian mountains until Termination 1.
B) The Last Maximum Ice Extent occurred mainly during MIS 5a – MIS 4. An asymmetrical glacier recession during MIS 3 was related to an increase in eastward aridity.
C) Significant glacier fluctuations during the MIS 3 – MIS 2 hinge, the appraisal of temperated-polythermal type of glaciers accompanied by a generalised moisture increase entailing valley glaciers to surge.
D) Side-to-side mountain range-scale deglaciation dissymmetry in MIS 2. The widespread expansion of tempered-polythermal type glaciers during the LGM period and Termination 1 had a proportional expansion to the available moisture.
The final deglaciation is characterised by relictual cirque glaciers disappearing during GS-1. In Andorra, a general rise in local river base levels occurred until the Holocene Optimum.
Mid-Late Pleistocene glacial dynamics in the Valira valleys (Principality of Andorra). Asymmetries within the Pyrenees and correlation across the westernmost European mountain ranges.
Unravelling the afore-cited glacial phases and unexpected research allows for a tesselated mapping of the SW continental Europe concerning part, or all of the LGC glacial phases outlined above (Figure 6):
1 – Areas where glaciers were prevalent during MIS 2, like the Iberian Central System, the NW and S French Massif Central, the NW Jura and the maritime Alps.
2 – Areas having a far-flung end moraine produced in a previous glacial phase (MIS 6 or posterior) showing stability until the MIS 2, as for ice caps/fields from the southern half of the Galicia mountains.
3 – Areas of pseudo-pleniglacial or apparent-pleniglacial condition, despite previous glacier recessions phases (albeit challenging to identify), as in most of the northern slope of the Pyrenees.
4 – Areas of multiphase glacier advances, like most of the southern slope of the Pyrenees, most of the Cantabrian Mountains, the half north of the Galicia mountains, the High Atlas, Sierra Nevada and the SW French Massif Central, the western Alps and the Vosges.
5 – Areas where glaciers were present from the LGM until Termination-I, like the northern Iberian range and Sanabria in Iberia. Nevertheless, other mountain ranges have a Type 5 glaciation scenario, like the southern Black Forest in Germany.
The AD Cam-Clay project takes its name from the .ad, which identifies Andorra as a country on the Internet and Clay of a recognized constitutive model and widely used in the science of soil mechanics.
The description of the objectives is structured in three sections. Type of research to be developed and the research elements. Brief explanation of the research project and conceptual model. Tools of research to use and case study.
1st) Type of research to be developed:
This project aims to enter the field of fundamental research. The project aims to develop an explanatory and predictive mathematical model. The mathematical model is based on an existing conceptual model that can be improved according to seconds the results obtained in mathematical modeling.
1b) The subject of the research: The subject of the research is a material of a geological or geomaterial nature, widely known in the Principality and geologically called "Till". In the slang of the country this geomaterial is described as "Rock in formation" or "decompose rock" due to its hardness as well as its ability to generate landslides, failures in buildings, cracks in walls, or their ability to confine groundwater. The target geomaterial is a rock and not a rock. It corresponds to a sediment deformed by the old glacier of Andorra and which has a significant amount of untreated data, under the tutelage of the Marcel Chevalier Private Foundation.
Geomaterial behaves differently depending on how it has been previously deformed (with water or without), and the place in the valley where it has been deformed as well as the depth at which it has been deformed. Numerical data on the behavior of geomaterial are known from the results pressure testing. This type of test is standardized and makes it easy to compare results incl s between distant geographical areas.
2a) Summary explanation: The project aims to develop a model that explains the values of deformation, due to the so-called preconsolidation pressure, which is observed in glacial deposits by a given from the small Andorran glacier.
2b) Conceptual model:
The dynamics are related to an accumulation of sediment and acorns at the bottom of the valley of Andorra, accompanied by a flow of groundwater generated by the melting of the ice. This water flow generates a pressure difference between the upper parts of the glacier and the discharge point at its front. In this context, the sediment at the bottom of the valley is submerged within an effort field tangential, developed by the friction exerted by the base of the glacier in displacement.
MESURES DE REMEDIACIÓ AMBIENTAL CONTRA ELS FENOMENS EROSIUS HÍDRICS ASSOCIAT...Fundació Marcel Chevalier
Poster per a la sessió Kick off del projecte SOLPYR (Poctefa 2023-2027) celebrada a Tremp el 29 i 30 d'abril.
Breu descipció: Al Juliol de 2015 una gran tempesta (de T~100 anys) va provocar una forta erosió a capçalera de conca, originant laves torrencials (debris flow) que amb el sediment exposat, a partir de llavors, inclusiva amb precipitacions mínimes (> 15 mm), es provocava aturades de la potabilitzadora d'aigües superficials que alimenta a Les Escaldes (15.000 hab.). Calia controlar l’enterboliment de l’aigua superficial.
Palaeoenvironmental changes in the Iberian central system during the Late-glacial and Holocene as inferred from geochemical data: A case study of the Navamuño depression in western Spain
Former cold-wet ice polythermal glaciers inferred from erratics and moraine's Schmidt Hammer ages at the Madriu valley, Principality of Andorra (SE- Pyrenees)
The document discusses research conducted on the Clot de la Menera rock glacier in northeastern Andorra. It includes details on field work conducted in Andorra, the geomorphology of the site, groundwater aquifers, anomalous spring water temperatures, apparent water ages from the coldest springs, electrical resistivity and NMR measurements taken with different sounding loops that revealed resistive surface layers and layers of high porosity at depths of 5 and 25 meters. The research analyzed the core nature and radioactive and stable isotopes within the rock glacier.
Mid-Late Pleistocene glacial dynamics in the Valira valleys (Principality of ...Fundació Marcel Chevalier
Many sediment-covered mountain areas affected by the growth of Pleistocene glaciers are over-consolidated. Palaeoglacial conditions are deduced from glacial consolidation and site investigations. Geomorphological evidence on the glacial extent and history is in this Thesis used as a framework for hydro-mechanical flow simulations in the valley glacier of Andorra and the lower Isère glaciated valley.
By classifying glacial phases of the northern Iberian Peninsula fringe, four common glacial phases arise for the last glacial cycle:
A) An early Glacial Cycle starting at MIS 5d having a recessional period during MIS 5c. Cold-type glaciers are expected to have existed in some of the extreme NW of the Iberian mountains until Termination 1.
B) The Last Maximum Ice Extent occurred mainly during MIS 5a – MIS 4. An asymmetrical glacier recession during MIS 3 was related to an increase in eastward aridity.
C) Significant glacier fluctuations during the MIS 3 – MIS 2 hinge, the appraisal of temperated-polythermal type of glaciers accompanied by a generalised moisture increase entailing valley glaciers to surge.
D) Side-to-side mountain range-scale deglaciation dissymmetry in MIS 2. The widespread expansion of tempered-polythermal type glaciers during the LGM period and Termination 1 had a proportional expansion to the available moisture.
The final deglaciation is characterised by relictual cirque glaciers disappearing during GS-1. In Andorra, a general rise in local river base levels occurred until the Holocene Optimum.
Mid-Late Pleistocene glacial dynamics in the Valira valleys (Principality of Andorra). Asymmetries within the Pyrenees and correlation across the westernmost European mountain ranges.
Unravelling the afore-cited glacial phases and unexpected research allows for a tesselated mapping of the SW continental Europe concerning part, or all of the LGC glacial phases outlined above (Figure 6):
1 – Areas where glaciers were prevalent during MIS 2, like the Iberian Central System, the NW and S French Massif Central, the NW Jura and the maritime Alps.
2 – Areas having a far-flung end moraine produced in a previous glacial phase (MIS 6 or posterior) showing stability until the MIS 2, as for ice caps/fields from the southern half of the Galicia mountains.
3 – Areas of pseudo-pleniglacial or apparent-pleniglacial condition, despite previous glacier recessions phases (albeit challenging to identify), as in most of the northern slope of the Pyrenees.
4 – Areas of multiphase glacier advances, like most of the southern slope of the Pyrenees, most of the Cantabrian Mountains, the half north of the Galicia mountains, the High Atlas, Sierra Nevada and the SW French Massif Central, the western Alps and the Vosges.
5 – Areas where glaciers were present from the LGM until Termination-I, like the northern Iberian range and Sanabria in Iberia. Nevertheless, other mountain ranges have a Type 5 glaciation scenario, like the southern Black Forest in Germany.
The AD Cam-Clay project takes its name from the .ad, which identifies Andorra as a country on the Internet and Clay of a recognized constitutive model and widely used in the science of soil mechanics.
The description of the objectives is structured in three sections. Type of research to be developed and the research elements. Brief explanation of the research project and conceptual model. Tools of research to use and case study.
1st) Type of research to be developed:
This project aims to enter the field of fundamental research. The project aims to develop an explanatory and predictive mathematical model. The mathematical model is based on an existing conceptual model that can be improved according to seconds the results obtained in mathematical modeling.
1b) The subject of the research: The subject of the research is a material of a geological or geomaterial nature, widely known in the Principality and geologically called "Till". In the slang of the country this geomaterial is described as "Rock in formation" or "decompose rock" due to its hardness as well as its ability to generate landslides, failures in buildings, cracks in walls, or their ability to confine groundwater. The target geomaterial is a rock and not a rock. It corresponds to a sediment deformed by the old glacier of Andorra and which has a significant amount of untreated data, under the tutelage of the Marcel Chevalier Private Foundation.
Geomaterial behaves differently depending on how it has been previously deformed (with water or without), and the place in the valley where it has been deformed as well as the depth at which it has been deformed. Numerical data on the behavior of geomaterial are known from the results pressure testing. This type of test is standardized and makes it easy to compare results incl s between distant geographical areas.
2a) Summary explanation: The project aims to develop a model that explains the values of deformation, due to the so-called preconsolidation pressure, which is observed in glacial deposits by a given from the small Andorran glacier.
2b) Conceptual model:
The dynamics are related to an accumulation of sediment and acorns at the bottom of the valley of Andorra, accompanied by a flow of groundwater generated by the melting of the ice. This water flow generates a pressure difference between the upper parts of the glacier and the discharge point at its front. In this context, the sediment at the bottom of the valley is submerged within an effort field tangential, developed by the friction exerted by the base of the glacier in displacement.
The document discusses the La Massana paleolake in northwest Andorra, including its lacustrine deposits, deltas, disturbances, stratigraphy, and time evolution. It also discusses evidence of recurring wildfires and 13C cycles in the region, and compares these past climate patterns to predictions about climate change and wildfire recurrence related to the North Atlantic Oscillation. The document was presented at a weather summit on existing climate archives and past climates.
Fòssils excepcionals que requereixen excavacions excepcionals. Geoterma Pirin...Fundació Marcel Chevalier
Troballa i extracció de dos fòssils excepcionals localitzats en zones amb un alt grau de degradació, una marca de pell deixada en unes argiles per un dinosaure sauròpode i un niu d’ous de dinosaure.
Accés a l'expliació: https://www.youtube.com/watch?v=tovbPrnHh38&feature=youtu.be
Prospección geofísica y geomecánica de la Ribera de Biesca (Pirineos centrales)Fundació Marcel Chevalier
El documento describe los estudios geofísicos y geomecánicos realizados en el valle glaciar de Biescas en los Pirineos centrales. Los resultados muestran tres unidades sedimentarias distintas: una unidad superior, una intermedia y una inferior sobre el sustrato rocoso. La unidad intermedia presenta variaciones laterales de facies. Los datos se comparan con otros valles glaciares como el de Andorra, mostrando una evolución geomorfológica compleja de los valles con múltiples avances y retrocesos glaciares.
Chronology, stratigraphy and geometry of an ice dammed paleolake depression i...Fundació Marcel Chevalier
This document summarizes research on the Navamuño depression located in the Sierra de Béjar in western Spain. A variety of geological, geophysical, and geomorphological studies were conducted to understand the origin and sediment fill of the depression. The studies found the depression was formed by tectonic extension along the Puerto de Navamuño strike-slip fault. Glacial activity during the last ice age and post-glacial sedimentation filled the depression. Three sedimentary layers were identified, with the oldest layer of unknown origin and age below younger Pleistocene and Holocene layers. The research provides a chronology and model of formation for the ice-dammed depression within the complex tectonic context.
Homenatge al geòleg de la Universitat de Saragossa Carlos Sancho Marcén efectuat el 7 de novembre 2019 i organitzat per la facultat de Geologia d'aquesta universitat.
This document summarizes luminescence dating results from glaci-fluvial and glaci-lacustrine deposits in the southern and southeastern Pyrenees mountains. Three main groups of dates are identified: an early last glacial period (MIS 5), MIS 3, and the last glacial termination (MIS 2 ending). The oldest date is around 141,000 years from a sample in the Segudet valley, providing evidence of a pre-last glacial cycle glaciation during MIS 6. Younger dates range from around 103,000 to 15,700 years, spanning the last glacial period and the end of the last ice age. The results help constrain the timing of glacial advances in the Pyrene
The document discusses using a geomechanical approach to obtain permeability coefficients (Cpx) from magnetic resonance sounding (MRS) data by relating Cpx to longitudinal seismic velocity (VL). Data from sites in Europe and Africa were used to develop a logarithmic relationship between Cpx and VL for confined aquifers. This approach needs further testing but shows promise as a robust method for hydrogeologists to estimate permeability when pumping tests are limited.
Extracció de mostres de sòl de 3 perfils en un transsecte
Col·locació de 3 termòmetres amb datalogguer
Tractament de les mostres obtingudes per obtenir el %CO
Fitxes descriptives + SIG + memòria
Mapes d’isovalors (contingut en CO, variació del segrest de carboni respecte el nivell del 1997)
Objectius;
Generar informació sobre l’estat actual d’un important embornal de carboni, els sòls, i els canvis a què ha estat sotmès
Aprofitar l’estat zero establert en l’estudi del 1997 per realitzar ara un nou mostreig, repetible en el futur, veure la tendència i avaluar la capacitat de segrest de CO2 atmosfèric
Publicar els resultats per tal que aquest estudi es pugui repetir en el futur i es trobi accessible per tothom
This document summarizes the geotechnical properties of glacial sediments in Andorra. It discusses two case studies: 1) a lateral moraine where samples showed evidence of multiple consolidation events, and 2) the bottom sediments of an overdeepened valley which exhibited decreasing shear strength with depth, indicating former high water pressures. Pressuremeter tests on these sediments revealed three types of stress-strain behavior: 1) a single yield point, 2) multiple yield points, and 3) continuous yielding without apparent yield points. This provides insights into the stress history and consolidation of glacial sediments in Andorra.
How are the water signals on a polythermal Glacier? MRS pilot study on Hansbr...Fundació Marcel Chevalier
- MRS surveys were conducted on Hansbreen glacier in Hornsund, Svalbard, Norway to investigate the presence and distribution of subsurface water.
- Three types of water signals were identified: 1) High amplitudes and decays in cold ice near the surface, indicating a karstic aquifer; 2) Low amplitudes and decays in temperate ice, with limited water; 3) Moderate-high amplitudes and long decays at depth, from an aquifer beneath the glacier.
- The results provide insights into subglacial drainage conditions and potential permafrost formation, and help link glacial sediments in Svalbard to deglaciation cycles observed in the Pyrenees.
Presentació de la Fundació Marcel Chevalier a la XXIX Jornada Andorrana de la Universitat Catalana d'Estiu 2016: "El canvi climàtic i Andorra" (20 agost 2016)
Projecte Aquateca (Mostreig d'aigües superficials i subterrànies del Principa...Fundació Marcel Chevalier
El projecte Aquateca es basa en un mostreig aleatori en l'espai i en el temps de les aigües superficials i subterrànies del Principat d'Andorra.
L'objectiu principal que persegueix és el de disposar d'un magatzem hídric que serveixi de base de dades per a qualsevol projecte local o internacional en l'àmbit del medi ambient, salut ambiental, climatologia i hidrologia superficial o subterrània.
Nuclear Magnetic Ressonance - Water content assessment in glacier ice and ben...Fundació Marcel Chevalier
Glaciers are widely spread on polar and sub-polar regions but also on middle latitude mountains, where cold-dry type glaciers, polythermal glaciers and temperate-wet glaciers are respectively present. Assess their water content is capital to understand the ice dynamics and how is related with the climate change.
Subglacial drainage in porous aquifer and sediment consolidation patterns in the glaciated valley of Andorra (Pyrenees). The poster was presented for the IAG/AIG (International Association of Geomorphologists) Regional Conference on Geomorphology Geodiversity of polar landforms which was held in Longyearbyen (Spitsbergen, Norway) on August 1-5, 2007. Conference was organised on the occasion of the International Polar Year 2007/2008 by the Association of Polish Geomorphologists.
Subglacial drainage in porous aquifer and sediment consolidation patterns in the glaciated valley of Andorra (Pyrenees). The poster was presented on the meeting "Segones Jornades del Crecit: La prospecció geològica en l'obra civil", available at http://www.iea.ad
The document discusses the La Massana paleolake in northwest Andorra, including its lacustrine deposits, deltas, disturbances, stratigraphy, and time evolution. It also discusses evidence of recurring wildfires and 13C cycles in the region, and compares these past climate patterns to predictions about climate change and wildfire recurrence related to the North Atlantic Oscillation. The document was presented at a weather summit on existing climate archives and past climates.
Fòssils excepcionals que requereixen excavacions excepcionals. Geoterma Pirin...Fundació Marcel Chevalier
Troballa i extracció de dos fòssils excepcionals localitzats en zones amb un alt grau de degradació, una marca de pell deixada en unes argiles per un dinosaure sauròpode i un niu d’ous de dinosaure.
Accés a l'expliació: https://www.youtube.com/watch?v=tovbPrnHh38&feature=youtu.be
Prospección geofísica y geomecánica de la Ribera de Biesca (Pirineos centrales)Fundació Marcel Chevalier
El documento describe los estudios geofísicos y geomecánicos realizados en el valle glaciar de Biescas en los Pirineos centrales. Los resultados muestran tres unidades sedimentarias distintas: una unidad superior, una intermedia y una inferior sobre el sustrato rocoso. La unidad intermedia presenta variaciones laterales de facies. Los datos se comparan con otros valles glaciares como el de Andorra, mostrando una evolución geomorfológica compleja de los valles con múltiples avances y retrocesos glaciares.
Chronology, stratigraphy and geometry of an ice dammed paleolake depression i...Fundació Marcel Chevalier
This document summarizes research on the Navamuño depression located in the Sierra de Béjar in western Spain. A variety of geological, geophysical, and geomorphological studies were conducted to understand the origin and sediment fill of the depression. The studies found the depression was formed by tectonic extension along the Puerto de Navamuño strike-slip fault. Glacial activity during the last ice age and post-glacial sedimentation filled the depression. Three sedimentary layers were identified, with the oldest layer of unknown origin and age below younger Pleistocene and Holocene layers. The research provides a chronology and model of formation for the ice-dammed depression within the complex tectonic context.
Homenatge al geòleg de la Universitat de Saragossa Carlos Sancho Marcén efectuat el 7 de novembre 2019 i organitzat per la facultat de Geologia d'aquesta universitat.
This document summarizes luminescence dating results from glaci-fluvial and glaci-lacustrine deposits in the southern and southeastern Pyrenees mountains. Three main groups of dates are identified: an early last glacial period (MIS 5), MIS 3, and the last glacial termination (MIS 2 ending). The oldest date is around 141,000 years from a sample in the Segudet valley, providing evidence of a pre-last glacial cycle glaciation during MIS 6. Younger dates range from around 103,000 to 15,700 years, spanning the last glacial period and the end of the last ice age. The results help constrain the timing of glacial advances in the Pyrene
The document discusses using a geomechanical approach to obtain permeability coefficients (Cpx) from magnetic resonance sounding (MRS) data by relating Cpx to longitudinal seismic velocity (VL). Data from sites in Europe and Africa were used to develop a logarithmic relationship between Cpx and VL for confined aquifers. This approach needs further testing but shows promise as a robust method for hydrogeologists to estimate permeability when pumping tests are limited.
Extracció de mostres de sòl de 3 perfils en un transsecte
Col·locació de 3 termòmetres amb datalogguer
Tractament de les mostres obtingudes per obtenir el %CO
Fitxes descriptives + SIG + memòria
Mapes d’isovalors (contingut en CO, variació del segrest de carboni respecte el nivell del 1997)
Objectius;
Generar informació sobre l’estat actual d’un important embornal de carboni, els sòls, i els canvis a què ha estat sotmès
Aprofitar l’estat zero establert en l’estudi del 1997 per realitzar ara un nou mostreig, repetible en el futur, veure la tendència i avaluar la capacitat de segrest de CO2 atmosfèric
Publicar els resultats per tal que aquest estudi es pugui repetir en el futur i es trobi accessible per tothom
This document summarizes the geotechnical properties of glacial sediments in Andorra. It discusses two case studies: 1) a lateral moraine where samples showed evidence of multiple consolidation events, and 2) the bottom sediments of an overdeepened valley which exhibited decreasing shear strength with depth, indicating former high water pressures. Pressuremeter tests on these sediments revealed three types of stress-strain behavior: 1) a single yield point, 2) multiple yield points, and 3) continuous yielding without apparent yield points. This provides insights into the stress history and consolidation of glacial sediments in Andorra.
How are the water signals on a polythermal Glacier? MRS pilot study on Hansbr...Fundació Marcel Chevalier
- MRS surveys were conducted on Hansbreen glacier in Hornsund, Svalbard, Norway to investigate the presence and distribution of subsurface water.
- Three types of water signals were identified: 1) High amplitudes and decays in cold ice near the surface, indicating a karstic aquifer; 2) Low amplitudes and decays in temperate ice, with limited water; 3) Moderate-high amplitudes and long decays at depth, from an aquifer beneath the glacier.
- The results provide insights into subglacial drainage conditions and potential permafrost formation, and help link glacial sediments in Svalbard to deglaciation cycles observed in the Pyrenees.
Presentació de la Fundació Marcel Chevalier a la XXIX Jornada Andorrana de la Universitat Catalana d'Estiu 2016: "El canvi climàtic i Andorra" (20 agost 2016)
Projecte Aquateca (Mostreig d'aigües superficials i subterrànies del Principa...Fundació Marcel Chevalier
El projecte Aquateca es basa en un mostreig aleatori en l'espai i en el temps de les aigües superficials i subterrànies del Principat d'Andorra.
L'objectiu principal que persegueix és el de disposar d'un magatzem hídric que serveixi de base de dades per a qualsevol projecte local o internacional en l'àmbit del medi ambient, salut ambiental, climatologia i hidrologia superficial o subterrània.
Nuclear Magnetic Ressonance - Water content assessment in glacier ice and ben...Fundació Marcel Chevalier
Glaciers are widely spread on polar and sub-polar regions but also on middle latitude mountains, where cold-dry type glaciers, polythermal glaciers and temperate-wet glaciers are respectively present. Assess their water content is capital to understand the ice dynamics and how is related with the climate change.
Subglacial drainage in porous aquifer and sediment consolidation patterns in the glaciated valley of Andorra (Pyrenees). The poster was presented for the IAG/AIG (International Association of Geomorphologists) Regional Conference on Geomorphology Geodiversity of polar landforms which was held in Longyearbyen (Spitsbergen, Norway) on August 1-5, 2007. Conference was organised on the occasion of the International Polar Year 2007/2008 by the Association of Polish Geomorphologists.
Subglacial drainage in porous aquifer and sediment consolidation patterns in the glaciated valley of Andorra (Pyrenees). The poster was presented on the meeting "Segones Jornades del Crecit: La prospecció geològica en l'obra civil", available at http://www.iea.ad
Ressenyes històriques sobre la fragilitat dels sòls de muntanya als Pirineus Orientals (Andorra-Alt Urgell-Cerdanya)
1. Ressenyes històriques sobre la fragilitat dels sòls de
muntanya als Pirineus Orientals
(Andorra-Alt Urgell-Cerdanya)
Senyal secular de l'acció antròpica sobre el medi natural
Valentí Turu i Carles Gascón
2. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
3. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
4. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
5. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
6. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
7. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
8. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
9. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
10. 21 de juliol 2015
Perafita - Claror (Basses Rojes)
16. Riu Escobet a la part alta
de Sant Julià de Lòria
(22 de juliol 2015 )
Riu Escobet a Aixirivall
Confluència del riu Escobet (tèrbol) i el de Llumeneres (net)
20. 22 de juliol 2015 Riu Auvinyà a La Peguera
Tall en la carretera de La Peguera pels esbaldregalls
21. 22 de juliol 2015 Riu Auvinyà a La Peguera
Tall en la carretera de La Peguera pels esbaldregalls
22. 22 de juliol 2015 Riu Auvinyà a Sant Julià de Lòria
L’aigua va atravessar el tancat provisional d’obra (en reparació)
Cubeta de retenció de sediments a la sortida del pont de la CG 1
23. 2007 REVISTA CENMA (1)
Ponsa & Planas (2007)
Publicació d’un aflorament sobre la retenció de sediments
29. 2019 Recerca històrica
Taula sintética
Cartografia Hartevelt (1970)
Segle Perafita Claror Vallcivera Cerdanya Cadí Andorra
IX X X
X
XI X X X
XII X 1206±5 X X
XIII Datació OSL X X X
XIV
XV X
XVI
XVII
XVIII
XIX X
XX
XXI X
30. Senyal secular de l'acció antròpica sobre el medi natural
Gràcies
La pressió sobre el medi en indrets fràgils pot fomentar l’erosió.
Amb tot les pluges torrencials sense acció antròpica directa poden
produir erosió .
L’activitat ramadera extensiva o la desforestació pot intensificar l’acció
erosiva, però també d’altres més actuals com les activitats turístiques
relacionades amb el transport rodat