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Spatial distribution of morphometric parameters of glacial cirques in the Central Pyrenees (Aran and Boí valleys)
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Orientador(es)
Resumo(s)
Glacial cirques are typical landscape
features of mid-latitude mountain environments like
the Central Pyrenees. Their morphology as well as
their spatial distribution provides insights about past
glaciers and climates. In this study, we examine the
distribution, morphometrical and topographical
characteristics of glacial cirques in two U-shaped
glacial valleys located in the Central Pyrenees – the
Aran and the Boí valleys. They are located in different
aspects of this mountain range (north vs south) under
different climatic influences that promoted distinct
glaciation patterns during the late Pleistocene. The
spatial mapping of these landforms was carried out
using high-resolution imagery and field observations.
We analysed the data of the morphometrical and
topographical variables of the glacial cirques by using
different statistical and geospatial methods in order to
unveil the factors controlling their formation and
development. A total of 186 glacial cirques were
mapped in the study area, including 119 in the Aran
and 67 in the Boí valleys. The local topography and
microclimate conditions lead to substantial
differences in both areas in terms of the morphology
and dimensions of the cirques. Glacial cirques in Boí
are distributed at slightly higher elevations than in
Aran and they are also larger, though their
dimensions decrease with elevation in both valleys.
Aran cirques are mostly oriented NE, while Boí
landforms do not show any prevailing aspect. Even
though lithology does not control the distribution of
the glacial cirques, some specific lithological settings
may favour the development of larger cirques. In
general, glacial cirques in the Aran and the Boí valleys
show morphometrical properties similar to those
reported in other mid-latitude mountain ranges.
Descrição
Palavras-chave
Central Pyrenees Aran and Boí valleys Glacial cirques Topography Morphometry
Contexto Educativo
Citação
Lopes, Luis, Oliva, Marc, Fernandes, Marcelo, Pereira, Paulo, Palma, Pedro, & Ruiz-Fernández, Jesús (2018) Spatial distribution of morphometric parameters of glacial cirques in the Central Pyrenees (Aran and Boí valleys). Journal of Mountain Science, 15(10), 2103–2119. https://doi.org/10.1007/s11629-018- 4873-x.
Editora
Springer