Condicionantes geomorfológicas e hidroclimáticas para hipersalinização em sistemas lacustres costeiros do semiárido brasileiro

Abstract

This research examines the association between geomorphological and hydroclimatic factors and drainages, in the formation of susceptible lacustrine systems to hypersalinization processes and evaporitic deposition. An historical survey regarding the integrated socio-environmental aspects was made; orbital and radar (SRTM) images were used to extract the area’s altimetry curves and the drainage network vector data was obtained. Then, secondary data was collected about groundwater’s chemical properties. The study area probably evolved from a freshwater system to an estuarine-lagoon during Holocene, until it became a lacustrine system. Throughout the drought periods, the studied area experienced evidences of hypersalinization and natural evaporitic deposition occurred. Therefore, this area’s salinization occurs due to drainage and groundwater table restriction conditions and evapotranspiration, which promote salt’s capillary ascension to the surface