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Coastal landforms and environments in the central sector of Gallocanta saline lake (Iberian Range, Spain)

Gallocanta Lake (NE Spain), with a high ecological value, is the largest and best preserved saline lake in Western Europe. The aim of this study is to map the landforms developed in the margins of the central sector of Gallocanta Lake, at adequate scale for the study of soils and habitats, which is needed for the delineation, management and protection of the wetland. Photointerpretation was combined with topographical, geological, and satellite data in a geographical information system. This study, applied in two selected areas of the central body of the lake, allowed the identification of contrasting landforms and processes in the lake margins. The southern margin, which receives most of the fluvial materials in the zone exhibits coastal progradation by means of barrier-island generation and sedimentation in the resulting coastal lagoon, a process that can be inferred from the map presented in this work and was confirmed by comparison of aerial photographs taken in different decades. With virtually no sediment supply on the margin, coastal erosion and shoreline retreat prevail. In summary, coastal landforms are a result of a complex combination of fluvial and lacustrine processes operating during high and low water-level periods.