Papers by Razvan Dumbrava
Environmental changes in East-Central Europe from a Middle to Late Holocene Romanian cave sediment record. In. Palaeogeography, Palaeoclimatology, Palaeoecology. Volume 659, 1 February , 2025
Caves are sensitive to hydrological processes including sediment transport associated with change... more Caves are sensitive to hydrological processes including sediment transport associated with changes in external climatic conditions. When located in the proximity of prehistoric settlements, cave sediments can provide details about human activities and help to elucidate the paleoenvironment. Here, we present a comprehensive analysis of lithological, geochemical, magnetic, organic matter, non-pollen palynomorphs, and charcoal data from sediment in Ciur Izbuc Cave, revealing significant paleoenvironmental and hydrodynamic changes over the past 6500 years. The first phase (6500-3500 calibrated years BP; cal BP) depicts a dynamic system with constant surface-subsurface connections, moderate-to-high erosion, and low-to-moderate sediment accumulation rates. The low charcoal levels during this phase indicate limited human impact. The second phase (3500-1400 cal BP) features contrasting depositional environments; the initial interval shows low accumulation under reduced water flow, reflective of a stable late mid-Holocene climate, while the subsequent interval reveals an abrupt shift to wetter conditions, characterized by runoff-derived minerogenic sediments. This period coincides with increased human impacts, including fire activity and land-use changes since the late Bronze Age. The third phase (1400-100 cal BP) exhibits complex hydrological dynamics, with sporadic, intense erosion linked to short-term climatic shifts. Increased charcoal concentrations and the presence of fungi indicate persistent human activity, intensifying after 300 cal BP. Our findings underscore the complex relationship between climate events, humans, and sediment dynamics in the Ciur Izbuc Cave, highlighting the utility of a multi-proxy approach in reconstructing past environmental changes.
GeoJournal of Tourism and Geosites, 2019
The present study aims to determine the role and importance of the tourist information and promot... more The present study aims to determine the role and importance of the tourist information and promotin centers from Bihor county taking into consideration the economic, social and cultural influence of tourism worldwide. These centers were established to provide tourists with the necessary and updated information regarding the tourist destination, thus to become a major part in the promotion of tourist attractions. The implemented methodology based on
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Papers by Razvan Dumbrava