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  • 1
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    Submarine geomorphology (2018)
    Cham : Springer
    Details
    Call number: 9783319578521 (e-book)
    Description / Table of Contents: This book on the current state of knowledge of submarine geomorphology aims to achieve the goalsof the Submarine Geomorphology working group, set up in 2013, byestablishing submarine geomorphology as a field of research, disseminating its concepts and techniques among earth scientists and professionals, and encouraging students to develop their skills and knowledge in this field.Editors have invited 30 experts from around the world to contribute chapters to this book, which is divided into 4 sections - (i) Introduction history, (ii) Data methods, (ii) Submarine landforms processes and (iv) Conclusions future directions. Each chapter provides a review of a topic, establishes the state-of-the-art, identifies the key research questions that need to be addressed, and delineates a strategy on how to achieve this.Submarine geomorphology is a priority for many research institutions, government authorities and industries globally.The book is useful for undergraduate and graduate students, and professionals with limited training in this field.
    Type of Medium: 12
    Pages: 1 Online-Ressource (xxiii, 556 Seiten) , Illustrationen
    Edition: corrected publication 2018
    ISBN: 9783319578521 , 978-3-319-57852-1
    ISSN: 2197-9545 , 2197-9553
    Series Statement: Springer geology
    URL: Ebook (access only within the AWI network)
    DOI: 10.1007/978-3-319-57852-1
    Language: English
    Note: Contents Introduction / Aaron Micallef, Sebastian Krastel and Alessandra Savini Part I Data and Methods in Submarine Geomorphology Sidescan Sonar / Ingo Klaucke Multibeam Echosounders / John E. Hughes Clarke Reflection and Refraction Seismic Methods / Gareth J. Crutchley and Heidrun Kopp Quantitative Analyses of Morphological Data / Philippe Blondel Seafloor Sediment and Rock Sampling / Aggeliki Georgiopoulou ROVs and AUVs / Veerle A.I. Huvenne, Katleen Robert, Leigh Marsh, Claudio Lo Iacono, Tim Le Bas and Russell B. Wynn Part II Submarine Landforms and Processes Origin and Geomorphic Characteristics of Ocean Basins / Peter T. Harris and Miles Macmillan-Lawler Drivers of Seafloor Geomorphic Change / Angelo Camerlenghi Shallow Coastal Landforms / Fantina Madricardo and Federica Rizzetto Continental Shelf Landforms / Ruth Durán and Jorge Guillén Submarine Glacial Landforms / Christine L. Batchelor, Julian A. Dowdeswell and Dag Ottesen Submarine Landslides / Joshu Mountjoy and Aaron Micallef Submarine Canyons and Gullies / David Amblas, Silvia Ceramicola, Thomas P. Gerber, Miquel Canals, Francesco L. Chiocci, Julian A. Dowdeswell, Peter T. Harris, Veerle A.I. Huvenne, Steven Y.J. Lai, Galderic Lastras, Claudio Lo Iacono, Aaron Micallef, Joshu J. Mountjoy, Charles K. Paull, Pere Puig and Anna Sanchez-Vidal Submarine Fans and Their Channels, Levees, and Lobes / Mark E. Deptuck and Zoltán Sylvester Contourite Drifts and Associated Bedforms / Ibimina Esentia, Dorrik Stow and Zeinab Smillie Volcanic Islands and Seamounts / Daniele Casalbore Mid-ocean Ridges / Neil C. Mitchell Cold Seep Systems / Silvia Ceramicola, Stéphanie Dupré, Luis Somoza and John Woodside Abyssal Hills and Abyssal Plains / Marie-Helene Cormier and Heather Sloan Oceanic Trenches / Jacob Geersen, David Voelker and Jan H. Behrmann Cold-Water Carbonate Bioconstructions / Claudio Lo Iacono, Alessandra Savini and Daniela Basso Part III Applied Submarine Geomorphology Applied Geomorphology and Geohazard Assessment for Deepwater Development / Roger Moore, Geoff Davis and Oliver Dabson Seabed Mining / Anne Peukert, Sven Petersen, Jens Greinert and François Charlot Fishing Activities / Ferdinand K.J. Oberle, Pere Puig and Jacobo Martín National Programmes: Geomorphological Mapping at Multiple Scales for Multiple Purposes / Terje Thorsnes, Lilja R. Bjarnadóttir, Alexandra Jarna, Nicole Baeten, Gill Scott, Janine Guinan, Xavier Monteys, Dayton Dove, Sophie Green, Joana Gafeira and Alan Stevenson Part IV Conclusion Conclusion / Aaron Micallef, Sebastian Krastel and Alessandra Savini Erratum to: Submarine Geomorphology / Aaron Micallef, Sebastian Krastel and Alessandra Savini
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  • 2
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    The Role of Fluid Seepage in the Erosion of Mesozoic Carbonate Escarpments (2021)
    Details
    Publication Date: 2022-03-29
    Description: Mesozoic submarine carbonate escarpments are erosional features that host box canyons, the formation of which had been attributed to seepage erosion in view of their similarity to subaerial box canyons. The latter had been cited as diagnostic of groundwater activity, although the efficacy of fluid seepage as an erosive agent in bedrock remains controversial. Here we use multibeam echosounder data from the Blake, Campeche, Malta and Florida Escarpments to demonstrate that box canyon formation is, in general, a significant process eroding carbonate escarpments. Numerical modeling based on parameters from the Florida Escarpment shows that box canyons can initiate and retrogressively evolve by fluid seeping via joints, which causes a reduction in rock strength due to fluid pressure and dissolution, resulting in periodic block failure at the canyon head. Box canyon elongation is promoted by an exponential distribution of joint density, an increase in joint density, joints oriented perpendicular and parallel to the escarpment, or an increase in the thickness of the flowing groundwater zone and slope gradient of the escarpment. The angularity of the canyon head decreases with a decrease in joint density and when joint density is uniform, whereas the canyon width is regulated by the extent of the joint set zone. Since the key factors contributing to box canyon formation along the Florida Escarpment appear to characterize the Blake, Campeche and Malta Escarpments, the groundwater model for box canyon formation should be applicable to these escarpments as well.
    Description: Plain Language Summary: Submarine carbonate escarpments are cliffs of limestone and dolomite that form anomalously steep topography on the Earth's surface. Box canyons—wide canyons with steep walls and semi‐circular heads—are a common feature in carbonate escarpments and they have been associated with groundwater seepage. In this study, we use seafloor depth information from four carbonate escarpments to show that box canyon erosion is a key process driving their evolution. Numerical modeling, on the other hand, suggests that fluid seeping in conditions similar to those of the Florida Escarpment can result in box canyon formation via periodic failure of the canyon head. Since these conditions at the Florida Escarpment can also be found in other escarpments such as the Blake, Campeche and Malta Escarpments, box canyon formation by groundwater seepage is likely a widespread geological process. The location of box canyons may suggest where fluid is seeping along escarpments and where specialized biological communities may be located. Box canyon formation is unlikely to pose a risk to coastal communities and offshore infrastructure.
    Description: Key Points: Box canyon formation is a significant erosive process across carbonate escarpments. Fluid seeping through joints can drive initiation and retrogressive evolution of box canyons via periodic block failure at the canyon head.
    Description: EC, H2020, H2020 Priority Excellent Science, H2020 European Research Council (ERC) http://dx.doi.org/10.13039/100010663
    Description: EC, H2020, H2020 Priority Excellent Science, Marie Skłodowska‐Curie Actions
    Description: EC, FP7, FP7 Marie Curie Actions (MCA)
    Description: Fulbright Association (FULBRIGHT) http://dx.doi.org/10.13039/100010629
    Description: David and Lucile Packard Foundation (PF) http://dx.doi.org/10.13039/100000008
    Keywords: ddc:551.3
    Language: English
    Type: doc-type:article
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  • 3
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    Can Offshore Meteoric Groundwater Generate Mechanical Instabilities in Passive Continental Margins? (2023)
    Details
    Publication Date: 2023-11-23
    Description: Offshore meteoric groundwater (OMG) has long been hypothesized to be a driver of seafloor geomorphic processes in continental margins worldwide. Testing this hypothesis has been challenging because of our limited understanding of the distribution and rate of OMG flow and seepage, and their efficacy as erosive/destabilizing agents. Here we carry out numerical simulations of groundwater flow and slope stability using conceptual models and evolving stratigraphy—for passive siliciclastic and carbonate margin cases—to assess whether OMG and its evolution during a late Quaternary glacial cycle can generate the pore pressures required to trigger mechanical instabilities on the seafloor. Conceptual model results show that mechanical instabilities using OMG flow are most likely to occur in the outer shelf to upper slope, at or shortly before the Last Glacial Maximum sea‐level lowstand. Models with evolving stratigraphy show that OMG flow is a key driver of pore pressure development and instability in the carbonate margin case. In the siliciclastic margin case, OMG flow plays a secondary role in preconditioning the slope to failure. The higher degree of spatial/stratigraphic heterogeneity of carbonate margins, lower shear strengths of their sediments, and limited generation of overpressures by sediment loading may explain the higher susceptibility of carbonate margins, in comparison to siliciclastic margins, to mechanical instability by OMG flow. OMG likely played a more significant role in carbonate margin geomorphology (e.g., Bahamas, Maldives) than currently thought.
    Description: Plain Language Summary: The flow of fresh to brackish groundwater has been proposed as an important process shaping the seafloor. However, we still have a poor understanding of how groundwater behaves in the sub‐seafloor and whether it can erode seafloor sediments. In this study, we test this hypothesis by using conceptual and realistic numerical models of two common types of seafloor margins—siliciclastic and carbonate—to assess the role of groundwater in making the seafloor susceptible to erosion. We show that the flow of groundwater offshore could have driven seafloor erosion close to the shelf break during the Last Ice Age, when sea level was lower than at present. Carbonate margins are more susceptible to this type of failure than siliciclastic margins. This may be explained by the higher variability in sediment properties across carbonate margins as well as the lower strength of their sediments. Groundwater has likely played an important role in shaping the seafloor in carbonate margins, and it may be responsible for landforms such as canyons, scars, and depressions in the Bahamas and the Maldives.
    Description: Key Points: Offshore meteoric groundwater (OMG) flow can drive mechanical instabilities in the outer shelf to upper slope. Such instabilities occur at, or shortly after, the Last Glacial Maximum sea‐level lowstand. Carbonate margins are more susceptible to mechanical instability by OMG than siliciclastic margins.
    Description: European Research Council http://dx.doi.org/10.13039/501100000781
    Description: National Science Foundation http://dx.doi.org/10.13039/100000001
    Description: https://doi.org/10.5281/zenodo.7094202
    Description: https://www.rocscience.com/software/slide2
    Description: https://figshare.com/s/5336d42d19ef771d4ad8
    Description: https://figshare.com/s/5027cd5ca22a7e96b3d1
    Keywords: ddc:551.3 ; offshore groundwater ; mechanical instability ; continental margins ; seafloor geomorphology ; siliciclastic ; carbonate
    Language: English
    Type: doc-type:article
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