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  • 1
    Book
    Book
    Gasuntersuchungen an schlickigen Sedimenten : = Investigations of gas in muddy sediments (1999)
    Kiel : Inst. für Geowissenschaften der Christian-Albrechts-Univ.
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Ostsee ; Meeressediment ; Schlick ; Gas ; Methan ; Konzentration ; Nordsee ; Meeressediment ; Schlick ; Gas ; Methan ; Konzentration ; Ostsee ; Meeressediment ; Schlick ; Gas ; Methan ; Konzentration ; Nordsee ; Meeressediment ; Schlick ; Gas ; Methan ; Konzentration ; Meeressediment ; Schlick ; Methan ; Gasgehalt
    Description / Table of Contents: Die Bildung von Gas im Meeresboden, vor allem in übersättigten Konzentrationen, kann zur Änderung der akustischen Eigenschaften von marinen Sedimenten führen. Dies Phänomen wird auch als Beckeneffekt bezeichnet. Die Gase können die Untersuchung von Sedimentschichten mit flachseismischen Systemen verhindern. Aus diesem Grund war die Konzentration von Methan und dessen Sättigungsgrenzen zu untersuchen. Die möglicherweise vorhandenen Bläschen sollten bezüglich ihrer Größe und Verteilung im Sediment analysiert werden.
    Type of Medium: Book
    Pages: IX, 120 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte / Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel 4
    Language: German
    Note: Zsfassung in engl. Sprache , Zugl.: Kiel, Univ., Diss., 1998
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  • 2
    Electronic Resource
    Electronic Resource
    Side-scan and acoustic subbottom characterization of the sea floor near the Dry Tortugas, Florida (1997)
    Springer
    Geo-marine letters 17 (1997), S. 246-252 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Between 2 and 6 February, 1995, a 25 km2 area at the Dry Tortugas (Florida Keys) was surveyed with a 100 kHz side-scan sonar system and 3.5-kHz subbottom profiler. The side-scan system revealed a pattern of alternating high and low backscatter. The subbottom profiler showed areas with no acoustic penetration between sediment troughs. The combination of both methods allowed delineation of the boundaries in high-backscatter regions, and sediment samples allowed correlations between high backscatter and coarser-grained sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670050034
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    Paper (German National Licenses)
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  • 3
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    The acoustic turbid layer in muddy sediments of Eckernfoerde Bay, Western Baltic: methane concentration, saturation and bubble characteristics (1997)
    Elsevier
    In:  Marine Geology, 137 (1-2). pp. 137-147.
    Details
    Publication Date: 2013-07-16
    Description: In Eckernfoerde Bay in the western Baltic, an enclosed basin with organic-rich mud, acoustic turbidity has been observed since 1952. To investigate the relationships between acoustic properties and free gas we developed a method for rapid sub-sampling of gravity cores to determine the total methane content. From temperature measurements, determinations of the salinity of the pore water and data from the literature, saturation limits were calculated for each core. It is demonstrated that there is a certain amount of free gas in the mud of Eckernfoerde Bay but subbottom depths of the oversaturation and of the acoustic turbidity do not correspond. The existence of free gas implies the existence of bubbles in the sediment which are regarded to be responsible for the acoustic turbidity. Bubble sizes observed by X-ray computed tomography while still under in situ pressure and temperature vary between 1 and 10 mm equivalent diameter. The distribution of bubbles is discontinuous, occurring in depth zones from 2 to 20 cm thickness.
    Type: Article , PeerReviewed
    DOI: 10.1016/S0025-3227(96)00084-9
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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