Procesos geomorfológicos en la interfaz fluvio-marina: dinámica sedimentaria y valoración de la geodiversidad del sistema Alemparte-Riosmar (A Mariña, Lugo)

Abstract

This paper analyzes the geomorphological dynamics of the Alemparte River and Riosmar Beach, located in Foz (Lugo, NW Iberian Peninsula). The aim is to provide a scientific basis for land use and management following the principles of “know and value”. The study begins by mapping the erosional escarpment at the river-sea interface from 1956 to the present. At a finer spatial and temporal resolution, sedimentary and topographic changes between the dry (summer) and wet (winter) seasons were assessed using gravelmeters and UAV imagery. Results indicate a highly dynamic sedimentary environment at Riosmar Beach, although with a neutral balance in sediment input and output. The alluvial fans feeding the beach are directly connected to the sea through the Alemparte River, forming a significant sediment transfer corridor. The study concludes by emphasizing the need for evidencebased management of highly geodiverse landscapes.