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  • Bremen  (3)
  • European Marine Board  (2)
  • AGU  (1)
  • Pergamon Press  (1)
  • 1
    Call number: ZSP-166-25
    Pages: 173 S. : Ill., graph. Darst.
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 25
    Branch Library: GFZ Library
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  • 2
    Call number: ZSP 16697-0482
    Pages: 298 S. : Abb. ; 30 cm
    ISSN: 0931-0800
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 104
    Branch Library: AWI Library
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  • 3
    Call number: ZSP-166-19
    In: Berichte aus dem MARUM und dem Fachbereich Geowissenschaften der Universität Bremen
    Type of Medium: Series available for loan
    Pages: 149 S. : Ill. ; graph. Darst.
    Series Statement: Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen 19
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Publication Date: 2020-08-05
    Description: The active channel–levee system of the middle Bengal Fan was studied by a combined analysis of Parasound echosounder and Hydrosweep swathsounder data. The channel is characterized by highly variable sinuosities. Compared to other mud-rich submarine fans, an exceptionally low channel slope is found. The system can be subdivided into inner and outer zones of significantly different depositional architecture. The inner zone consists of the active channel and sharply separated vertical blocks, which are characterized by parallel, distinct reflectors and planforms of bends. These blocks are interpreted as abandoned channel segments (cut-off loops). The outer zones represent undisturbed levees, which are constructed of parallel and wedge-shaped sedimentary units. The wedge-shaped units, varying significantly in thickness and lateral extent, are found at the outer convex arcs of active and abandoned channel loops caused by overspilling of channelized turbidity currents at sharp bends. The parallel units are the deposits of turbidity currents, which spread their sediments over wide areas as their size significantly exceeds the cross-section of the channel. The complex vertical and horizontal distribution of partially small sedimentary units suggests a more complicated deposition in time and space as hitherto reported from other submarine fans. Within the inner zone, more than 20 cut-off loops were identified over a channel length of 90 km. In contrast to most other large mud-rich submarine fans, channel avulsion within the active channel–levee system is a frequent process. In particular, a temporal succession of at least 4 cut-off loops was reconstructed in the southern study area, indicating channel avulsion on average every 750 years. Channel avulsion seems to be a repetitious process caused by erosion through turbidite currents in a highly sinuous channel. Compared to other submarine fans, no morphological parameter shows a remarkable difference except the channel slope, which is significantly smaller than, for example, on Amazon, Congo and Mississippi fans. The interaction between this low channel slope and the flow parameter of the turbidity currents is most likely the reason for the instability of the active channel planform, leading to an exceptionally large number of meander loop breaches and cut-off loops.
    Type: Article , PeerReviewed
    Format: text
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  • 5
    Publication Date: 2024-02-07
    Description: EMB Future Science Brief N°7 outlines the current state of our knowledge on the sources of anthropogenic sounds and the effects of noise on marine organisms. Moreover, it provides an overview of the measures that have been taken to address the issue of underwater noise. In order to develop proportionate mitigation strategies and effective regulation, we have to advance our knowledge about the effects of anthropogenic noise on marine organisms and their ecosystems.
    Type: Book , NonPeerReviewed
    Format: text
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  • 6
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    AGU
    In:  EPIC3AGU Chapman Conference on the Agulhas System and its Role in Changing Ocean Circulation, Climate, and Marine Ecosystems, Stellenbosch, South Africa, 2012-10-08-2012-10-12AGU
    Publication Date: 2019-08-19
    Description: New high-resolution bathymetric and sub-bottom profiler data collected in the Southern Mozambique Channel along a grid of 16 parallel, non-overlapping lines show a large variety of bedforms which were formed by strong bottom currents. They are visually classified into four main microtopographic zones and several sub-zones which divide the study area into regions with (1) smooth seafloor, (2) undulating bedforms, (3) seamounts and islands, and (4) the Zambezi Channel. A smooth seafloor occurs on the Mozambican continental slope together with downslope mass-wasting processes, north and south of Bassas da India, on the eastern levee of the Zambezi Channel and in the Zambezi cone. Undulating bedforms of some kilometres wavelength and several tens of metres height cover most of the southern, central and northeastern study area. The most spectacular bedforms are numerous, closely spaced, giant erosional scours of up to ~450 m depth, more than ~20 km length and ~3 - 7 km width in the southwestern part of the study area. Here, northward flowing Antarctic Bottom Water (AABW) is topographically blocked to the north and deflected towards the east due to the shallowing bathymetry of the Mozambique Channel. SW-NE trending undulating bedforms aligned parallel to the deflected AABW and interpreted as small contourite mounds allow to trace the AABW flow path eastwards. An ~100 km long W-E trending channel indicates the northernmost extension of the AABW. NW-SE oriented undulating bedforms in the west, hummocky bedforms in the east and arcuate, cross-cutting features in-between reflect a completely different current regime in the central study area. Comparisons with LADCP sections show, that the western part lies in the range of deep-reaching anticyclonic Mozambique Channel eddies (MCEs), so that the undulating bedforms are again considered to be small contourite mounds aligned parallel to a part of the swirl. The cross-cutting features in the middle mark the eastern boundary of the MCE, where a northbound flow direction prevails. The hummocky bedforms in the east may have developed under the influence of seasonally variable cyclonic East Madagascar Current eddies pretending at least two different flow directions. The origin of arcuate bedforms, sediment ridges and circular or elongate depressions in the northeastern study area is not clear. Bottom currents which interact with the topography of the Bassas da India complex and the Zambezi Channel may contribute to their formation. All morphological features are draped with sediments indicating that the present-day current velocities are not strong enough to erode sediments. This agrees with published LADCP bottom-current velocities of 0.1 m/s. Hence, the microtopography must originate from a time when bottom-current velocities were stronger. Assuming a published sedimentation rate of 20 m/Myrs and a drape of at least 50 m thickness the microtopography may have developed during Pliocene times or earlier.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 7
    Publication Date: 2023-12-20
    Description: The Ocean presents a cacophony of sounds originating from natural as well as anthropogenic sources. Marine organisms heavily rely on sound to communicate and understand the world around them, and are therefore potentially impacted by anthropogenic sound. However, in developing our Blue Economy and in advancing our knowledge of marine environments and ecosystems, anthropogenic noise is sometimes unavoidable. Understanding the potential effects of anthropogenic noise is therefore integral to addressing this conflict, as it is needed to develop proportionate mitigation strategies and effective regulation. Next to providing an overview of our current knowledge about underwater noise, this publication highlights the priority areas for further research addressing the remaining knowledge gaps about the effects of anthropogenic noise. Furthermore, it points out the relevant actions needed to take in order to ensure ecosystem-based and precautionary legislation.
    Description: Challenge 2: Protect and restore ecosystems and biodiversity; Challenge 7: Expand the Global Ocean Observing System.
    Description: Published
    Description: Refereed
    Keywords: Blue Economy ; Marine ecosystems ; Underwater noise
    Repository Name: AquaDocs
    Type: Report
    Format: 56pp
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