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Citation link: https://doi.org/10.26092/elib/2342

Publisher DOI: https://doi.org/10.1002/esp.5610
Yu_etal_2023_Channel inception through bottom-current erosion of pockmarks revealed by numerical simulation.pdf
 
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Channel inception through bottom‐current erosion of pockmarks revealed by numerical simulation


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Yu_etal_2023_Channel inception through bottom-current erosion of pockmarks revealed by numerical simulation.pdfPostprint4.01 MBAdobe PDFEmbargoed until April 25, 2024
Yu_etal_supplementary-material-ESPL-2023_Postprint.pdfPostprint615.31 kBAdobe PDFEmbargoed until April 25, 2024
Authors: Yu, Kaiqi  
Lefebvre, Alice 
Li, Wei  
Zhan, Wenhuan 
Miramontes, Elda  
Abstract: 
In deep-marine environments, the inception of channels can be induced by the interaction between bottom currents and rough topography. However, it is still unclear under which conditions such features can form and what happens in the earliest phase of channel development. In this study, based on the morphological, sedimentary and oceanographic settings of a pockmark field in the NW South China Sea, we reveal the process of channel inception through the erosion of pockmarks by bottom currents. Using numerical simulations, we show that an appropriate current velocity can induce the erosion of pockmark trains in cohesive sediments, leading to the coalescence of discrete pockmarks and the formation of a channel with a rough thalweg. The interaction of bottom currents with the pockmarks induces a significant erosion along the pockmarks axis. Bottom current erosion is strongest at the downstream edges of pockmarks, where the horizontal velocity reaches a maximum and an upwelling forms. Erosion increases as the distance between pockmarks reduces. In our simulation results, a channel is only formed by the coalescence of pockmarks if the distance between pockmarks is <6 times the diameter of the pockmark. This study provides evidence of the formation of channels by bottom currents, which helps reconstruct paleoceanographic conditions based on sediment architecture. It also shows the complex hydrodynamics at these structures that strongly control sedimentary processes and may affect distribution of benthic ecosystems in marine environments.
Keywords: Channel inception; Bottom current erosion; Pockmark; Numerical Simulation; Morphological evolution
Issue Date: 23-Apr-2023
Project: Guangdong Basic and Applied Basic Research Foundation 
National Natural Science Foundation of China 
CAS Pioneer Hundred Talents Program 
Grant number: 2020B1515020016
41876054
Y8SL011001
Journal/Edited collection: Earth Surface Processes and Landforms 
Start page: 1
End page: 14
Type: Artikel/Aufsatz
ISSN: 0197-9337
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2342
URN: urn:nbn:de:gbv:46-elib70217
Faculty: Fachbereich 05: Geowissenschaften (FB 05) 
Marum – Zentrum für Marine Umweltwissenschaften 
Appears in Collections:Forschungsdokumente

  

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