Mapping Onland River Channels up to the Seafloor along Offshore Cide-Sinop in the Southern Black Sea from the Perspective of the Black Sea Flooding

Authors : Neslihan OCAKOĞLU, Fatmagül KILIÇ GÜL, Yeliz İŞCAN ALP

Pages : 116-126

Doi:10.30897/ijegeo.948042

View : 9 | Download : 5

Publication Date : 2022-03-06

Article Type : Research Paper

Abstract :In order to investigate the submarine morphology of offshore Cide-Sinop from the perspective of the Black Sea flooding, the rivers, submarine channels and some spatial data were extracted by using General Bathymetric Chart of the Oceans insert ignore into journalissuearticles values(GEBCO-2014); which is a seamless digital elevation and bathymetry grid insert ignore into journalissuearticles values(DEM);, and Geographic Information System insert ignore into journalissuearticles values(GIS); software tools. The accuracy of extracted land rivers were controlled with 1/25K topo-maps by using buffer overlay method. The comparisons affirmed that the rivers are on ratio of 75% in 0-400 meters buffer distance. The derived submarine channels with a total of 1548 km length indicate that there is a dendritic drainage pattern with the flow direction from north to the south extending from coast to shelf plain, shelf break and converging toward the abyssal plain respectively in the study area. However, seismic profiles do not indicate any recent delta deposits on the shelf plain. The only some prograded delta deposits are determined at the shelf break in a limited area, where they coincide with the submarine channels derived in this study. These deposits are truncated from their top by an erosional surface which extends over the whole shelf plain. These results indicate that the derived submarine channels do not represent the current flow pattern offshore Cide-Sinop. Instead, they illustrate paleochannels that should be active during the last lowstand time, before the Black Sea Flood and their sedimentary influx should also control the developments of canyons located at the shelf edge at that time. However, the most of the canyons located on the shelf slope are under the influence of both submarine erosion and active tectonics at present.
Keywords : DEM, GIS, Submarine Morphology, Paleochannel Network, Passive Canyons, Offshore Cide Sinop