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Dinámica estacional de los procesos de meteorización en cárcavas del Pirineo Central

Authors: Nadal-Romero, Estela; Regüés-Muñoz, D.; Martí Bono, Carlos Enrique; Serrano Muela, M. P.;

Dinámica estacional de los procesos de meteorización en cárcavas del Pirineo Central

Abstract

[EN] Badland morphologies are one of the most characteristic elements, due to abundance and hydro-sedimentological impact, in the Central Pyrenees. The genesis and development of badlands is favoured by bedrock lithology, topography and climate. The main purpose of this paper is to study geomorphological dynamics of these badlands and, particularly, the temporal and spatial relationships of the weathering processes. The study, performed in a small mountain catchment (45 ha) with a dense network of badlands (9 ha), is focused in the election and control of some physical variables that allow the temporal comparison of surface regolith development and that can be considered as weathering indicators of the marls. The results validate the methodology in use, favouring processes description, their chronological sequence and their relationship with climatic and topographic parameters. The development and dynamics of regolith on the north-facing slope is more active than on the south-facing slope. On the north-facing slope freezethawing are the main weathering processes, while on the south-facing slope prevails the crusting development associated to wetting-drying processes. On the other hand, the dissolution of carbonates is higher in the north exposition, and especially on the upper layers of the regolith, because to the washing effects and minor temperatures.

[ES] Las cárcavas constituyen un elemento característico del paisaje en la Depresión Interior Altoaragonesa (Pirineo Central). La génesis y desarrollo de estas morfologías está favorecida por la litología margosa del substrato, la topografía y la estacionalidad climática. El objetivo principal de este trabajo es analizar y describir las relaciones espacio-temporales de los procesos de meteorización. El estudio se ha centrado en el seguimiento de algunas variables físicas que permiten contrastar temporalmente el desarrollo del regolito superficial, actuando como indicadores del estado de meteorización. Los resultados han facilitado la identificación de procesos, su secuencia cronológica y su relación con parámetros climáticos y topográficos. Destaca un importante contraste entre vertientes N y S, con mayor dinámica y desarrollo del regolito en laderas norte, dónde predomina la meteorización asociada a procesos de hielo-deshielo además de una mayor disolución de carbonatos, mientras las laderas sur están más afectadas por procesos de humectación-desecación y encostramiento.

Este trabajo ha sido realizado con el apoyo de los siguientes proyectos: “Procesos hidrológicos en cuencas pirenaicas en relación con cambios de uso del suelo y fluctuaciones climáticas” (PIRIHEROS, REN 2003-08678/HID) y “Caracterización y modelización de procesos y regímenes hidrológicos en cuencas aforadas para la predicción en cuencas no aforadas” (CANOA, CGL 2004-04919-C02-01). La monitorización de la cuenca también ha sido financiada mediante el convenio entre el CSIC y el Ministerio de medio ambiente (Proyecto RESEL). Asimismo, el primer autor cuenta con una beca predoctoral I3P concedida por el CSIC junto al Programa Social Europeo. Por último los autores desean expresar su agradecimiento a Noemí Lana- Renault, Eugenio Mingo, Ethel Navarro y Jérôme Latron por su colaboración en algunas tareas de campo, al Dr. José Maria García Ruiz por su ayuda en la selección del área de estudio y al Dr. Ignasi Queralt por los análisis mineralógicos de las margas.

Peer reviewed

Keywords

Marl, regolito, Indicadores de estado físico, Regolito, indicadores de estado físico, Weathering, Pirineo Central, Regolith, Indicators of physical state, Artículos de Investigación, Meteorización, meteorización, Badlands, marga, Marga, cárcavas, Cárcavas, Central Pyrenees

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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