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Title: GAS SEEPS IN THE NORTH WESTERN PART OF THE BLACK SEA PRELIMINARY RESULTS
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GAS SEEPS IN THE NORTH WESTERN PART OF THE BLACK SEA PRELIMINARY RESULTS
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1314-2704
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English
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21
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1.1
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• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA |
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The NW part of the Black Sea is under the strong influence of the Danube River that discharges into the basin. Danube, through the input of sediment and water, has a double function in controlling the gas presence in NW Black Sea shallow sediments. The first function is to deliver into the sea the terrestrial organic matter that it is added to the marine in origin one. The second function is to provide a sustained sedimentation rate, needed to bury older organic matter, conducting to biogenic generation of methane in shallow sediments. Some previous works showed that in this part of the sea there are also thermogenic pools of methane (some of them exploitable) that could be microbiologically reprocessed and reach the shallow part of the sediment pile, mainly via tectonics or some preferential pathways. The gas seeps are important features for the marine habitat but also in case of submarine infrastructure works, when they could be seen as natural hazards. The most effective technique in mapping and characterizing submarine gas seeps is by using the multibeam echosounder – water column recording. We conducted several sea campaigns of multibeam echosounding – MBES, employing a NORBIT iWMBSh equipment and we have been able to map and classify the gas seeps. The method produces a huge amount of data that usually is replayed offline, searching for specific acoustic facies that indicates when gas streams are present in the water column. We mapped on the sea bottom the x, y and z coordinates of each seep location. According with the acoustic facies of the gas stream in the water column, the detected seeps have been also classified function of their intensity.
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conference
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
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21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
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Proceedings Paper
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STEF92 Technology
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SGEM International Multidisciplinary Scientific GeoConference
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
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483-490
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16 - 22 August, 2021
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website
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cdrom
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7817
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multibeam; water column; gas seep
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