Tipuri de produse cartografice specifice Gurii Sulina, din perspectiva Comisiunii Europene a Dunarii
This first step is important for the next analisys approach regarding the evolution of the Sulina mouth, based on the bathymetrical numerical models. ECD had been asigned (between 1856-1939) the fullfilling of all activities required for the navigation on the Sulina mouth and in the Danube Delta. Another very significant component of ECD activity consisted in the bathymetrical measurments and making maps and plans of the Sulina mouth.
Over the last half century, while the total sediment load of the Danube dramatically decreased due to dam construction on tributaries and its main stem, a grand experiment was inadvertently run in the Danube delta: the construction of a dense network of canals, which almost tripled the water discharge toward the interior of the delta plain. We use core-based and chart-based sedimentation rates and patterns to explore the delta transition from the natural to an anthropogenic regime, to understand the effects of far-field damming and near-field channelization, and to construct a conceptual model for delta
development as a function sediment partition between the delta plain and the delta coastal fringe.
Evolution of Chilia lobes of the Danube delta: Reorganization of deltaic processes under cultural pressures
The growth of Chilia deltaic lobes reflects a drastic reorganization of the Danube delta that accompanied its rapid expansion in the late Holocene. Using new cores collected at the apices of the two older Chilia lobes, together with historical maps and satellite photos, we find that a partial avulsion since 1500 years BP led to a gradual rejuvenation of the Chilia distributary. This process led to the successive infilling of a lake and a lagoon and subsequently to the construction of an open coast lobe at the Black Sea coast.
Accelerated sea-level rise and anthropogenic stresses on large delta-forming rivers have led to intense pressure on deltas around the world. To address issues of maintenance and restoration natural deltaic processes need to be understood in detail. The evolution of Danube delta was studied by numerous researchers in the last century and a vast majority of these studies were driven by development concerns for navigation, resource exploration, agriculture, and fisheries.
Young Danube delta documents stable Black Sea level since the middle Holocene: Morphodynamic, paleogeographic, and archaeological implications
New radiocarbon and optical dates show that the Holocene Danube delta started to build out of a Black Sea embayment 5200
yr ago. Delta lobe development phases differ by as much as 5 k.y. from previously proposed ages. The new chronology allows for a better understanding of the Danube delta paleogeography, including the demise of Istria, the main ancient Greek-Roman city in the region.
The collapse of the Bronze Age Harappan, one of the earliest urban civilizations, remains an enigma. Urbanism flourished in the western region of the Indo-Gangetic Plain for approximately 600 y, but since approximately 3,900 y ago, the total settled area and settlement sizes declined, many sites were abandoned, and a significant shift in site numbers and density towards the east is recorded. We report morphologic and chronologic evidence indicating that fluvial landscapes in Harappan territory became remarkably stable during the late Holocene as aridification intensified in the region after approximately 5,000 BP. Upstream on the alluvial plain, the large Himalayan rivers in Punjab stopped incising, while downstream, sedimentation slowed on the distinctive mega-fluvial ridge, which the Indus built in Sindh. This fluvial quiescence suggests a gradual decrease in flood intensity that probably stimulated intensive agriculture initially and encouraged urbanization around 4,500 BP.
A catastrophic flooding of the Black Sea basin was proposed to have occurred during its reconnection to the ocean in the early Holocene. Possible cultural consequences of the flood include the migration of Neolithic farmers from around the Black Sea towards central Europe as well as the creation of flood myths. Stratigraphic and paleo-geomorphologic information from Danube delta aided by radiocarbon ages on articulated mollusks constrain the level in the Black Sea before the marine reconnection to ca 30 m below the present sea level rather than 80 m or lower. If the flood occurred at all, the sea level increase and the flooded area during the reconnection were significantly smaller than previously proposed.
This paper studies the dynamics of the Sulina branch mouth by analyzing the influence of human intervention on sediment deposition at the point at which the Danube river empties into the sea. The surface and volume of the bar and southern spit at the Sulina branch mouth are calculated for the first time using advanced techniques. The methodology consisted in georeferencing and vectoring the maps produced by the European Commission of the Danube (ECD), followed by a morphometrical separation of the bar and southern spit in the resulting models (from a 5 m depth to the surface).
Over the last century humans have altered the export of fluvial materials leading to significant changes in morphology, chemistry, and biology of the coastal ocean. Here we present sedimentary, paleoenvironmental and paleogenetic evidence to show that the Black Sea, a nearly enclosed marine basin, was affected by land use long before the changes of the Industrial Era. Although watershed hydroclimate was spatially and temporally variable over the last ,3000 years, surface salinity dropped systematically in the Black Sea.