Natural and induced slope instability associated with large mass movements during the Pleistocene-Holocene in the Serra dos Ancares (NW of the Iberian Peninsula)

The Serra dos Ancares is a natural area affected with steep slopes by quaternary glacial processes. The presence of up to 28 landslides has been detected on these slopes in the entire sector studied. The existing landslides had been considered mostly of natural origin, but the data collected indicat...

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Bibliographic Details
Published in:Anales de Geografía de la Universidad Complutense
Main Authors: Valcarcel, Marcos, Vázquez-Rodríguez, Alexandre Luis, Pontevedra-Pombal, Xabier
Format: Article in Journal/Newspaper
Language:Spanish
Published: Ediciones Complutense 2022
Subjects:
SIG
Online Access:https://revistas.ucm.es/index.php/AGUC/article/view/81806
Description
Summary:The Serra dos Ancares is a natural area affected with steep slopes by quaternary glacial processes. The presence of up to 28 landslides has been detected on these slopes in the entire sector studied. The existing landslides had been considered mostly of natural origin, but the data collected indicate that a significant number of them, qualitatively and quantitatively, are anthropogenic in origin. In the 1st century B.C. the Roman Empire occupied the area and, once settled, began to exploit it, due to the presence of gold deposits. The Roman gold extracting activity entailed a series of infrastructures that produced an intense erosion of the land in a short time, inducing multiple landslides. The aim of this work is to establish a classification of the mass movements in the study area, determining factors such as their volume, surface or typology and relating them to their different origins, as well as to determine the impact of natural and anthropic activity in the mountain range, and its imprint on the current landscape. La Serra dos Ancares es un espacio natural afectado por los procesos glaciales del Cuaternario, y que presenta fuertes pendientes en sus laderas. Se describen hasta 28 movimientos de masas en todo el sector estudiado. Los deslizamientos existentes se habían considerado mayoritariamente como de origen natural. Los datos indican que un número significativo de ellos, cualitativa y cuantitativamente, son antrópicos. Una vez asentado el Imperio Romano comienza la extracción sistemática de oro, lo que conlleva una serie de infraestructuras, produciendo una intensa erosión del terreno en un corto intervalo de tiempo. El objetivo de este trabajo es establecer una clasificación de los movimientos de masas en el área de estudio, determinando factores como su volumen, su superficie o su tipología y relacionándolos con sus diferentes orígenes, así como determinar el impacto de la actividad natural y antrópica en la cordillera y su huella en el paisaje actual. La Serra dos Ancares est une zone naturelle ...