Reconocimiento geológico del entorno de las albuferas de Adra (Almería) a partir de datos geofísicos

Zusammenfassung

Geophysical techniques (Electrical Resistivity Profiles and Penetration Tests) have been used to identify the nature and geometry of the materials in which the Adra (Almería) lagoons are placed. Furthermore, a series of shallow piezometers (less than 3 meters depth) have been made in order to measure the watertable and to take soil samples. The obtained results show a substratum (metapelitic?) approximately at 70 m depth. Above this substratum there are sandy detritic materials saturated with waters of various salinity between fresh and saline. This fact indicates a thick transition zone due to the relatively low freshwater flow to the sea in this area. In the inmediate setting in which the lagoons are situated, there has been found alternating organic mud beddings and gravels into the sandy matrix. The sedimentary environment may correspond to several coastal bars with fluvial influence in a context of neotectonic activity