Cartografia geomorfológica glaciária e delimitação da paleoglaciação da Serra Amarela

Abstract

Geomorphological research on the Pleistocene glaciation of Serra Amarela, located in the Peneda-Gerês National Park (PNPG), dates to the early 1980s. However, the boundaries of the glaciated area remain imprecise for glacial reconstruction. This low-lying mountain with 1361 m of altitude is characterized by its W-E asymmetric topography and by the dominance of granitic lithology and sparse metamorphic rocks. Fluvial and relict periglacial landforms dominate the steep western slopes. On the other hand, the steep eastern slopes reveal evidence of former glacial activity with traces of erosion and deposits, particularly in the Ramisquedo glacial cirque. The current study introduces a new geomorphological map of Serra Amarela, created using high-resolution LiDAR data and supplemented with interpretations of landforms and validated through fieldwork. The collected data, on the glaciation of Serra Amarela, allowed us to make several key measurements: the Maximum Glacial Extent (MGE) at 1 km², the maximum ice thickness at 92 m, an estimated volume of 26,4 hm3, and the ELA-AABR at 1122 m.