C. Fulga’s research while affiliated with National Institute for Research and Development of Marine Geology and Geoecology (GeoEcoMar) and other places

Late Quaternary climate changes triggered the succession of several sedimentary environments, especially in the areas close to the current Romanian Black Sea shoreline. These have resulted in the succession of continental and marine lithofacies. The Mamaia karst depression consists of a sedimentary fill, which contains two marine transgression sequences (Surozhian and Holocene) divided by a sedimentary break, corresponding to the MIS 2 regression. The samples from two cores from the Mamaia barrier beach were analysed for lithology, texture, mineralogy, and fauna (molluscs, foraminifera, and ostracods).

Constanta city is located on the Black Sea coast in the eastern part of the Romanian South Dobrogea region. Global warming in the Dobrogea region promotes drought conditions that decrease groundwater levels and increase abstraction rates in the shallow unconfined aquifers (loess deposits and karstified Sarmatian limestones) being used for public supply. This study advocates using an alternative confined and high quality groundwater source in the zone adjacent to the tectonic blocks 5 and 10, where the Senonian aquitard ensures delays to climate change and provides protection from potential anthropogenic contaminants. Our review of the hydrogeologic and technical conditions further suggest that abstraction wells need to be developed within the Constanţa city limits and Upper Jurassic–Lower Cretaceous aquifer (400–1,200 m thick). Suggested optimal exploitation characteristics are proposed. KeywordsClimate change-Global warming-Aquifer-Coastal area-Tectonic block-Abstraction well

An 18 m depth bore hole was drilled in the northern part of the Agigea barrier beach. On the basis of complex textural, mineralogical, and faunistic (moluska fauna) analyses performed on samples collected from this drilling, a stratigraphic evolution model during the Holocene time was performed. Briefly, in the Agigea barrier beach area, the marine sedimentation began with the Upper Kalamitian beds. In those times, the Agigea river valley was much more extended seaward, so that the access to the coastal marine sediments was actually reduced. According as the sea level rose, the Agigea river valley was flooded by the sea, in the shape of a marine bay then it was closed by a barrier beach. It is very important to know the trend of palaeoenvironmental evolution of the Agigea lake area in designing the medium and long-term management.