Article
Geosciences, Multidisciplinary
Tim R. McHargue, David M. Hodgson, Eitan Shelef
Summary: The article highlights the diversity of lobate deposits in deep-water settings and their importance in depositional architecture. Through three examples, the influence of different source materials on the sediment structure is discussed.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Yao Shunyu, Nazir Ahmed Bazai, Tang Jinbo, Jiang Hu, Yi Shujian, Zou Qiang, Tashfain Ahmed, Guo Jian
Summary: This study analyzed the impact of topography on the movement process of a debris flow in Wujia Gully, China. The debris flow was found to be a typical viscous debris flow with four stages in its dynamic process, and the topography played a significant role in the formation of these stages. Additionally, Manning's resistance coefficient affected the velocity and duration of each stage.
Article
Geochemistry & Geophysics
Lewis P. Bailey, Michael A. Clare, Ed L. Pope, Ivan D. Haigh, Matthieu J. B. Cartigny, Peter J. Talling, D. Gwyn Lintern, Sophie Hage, Maarten Heijnen
Summary: Quantification of the controls on turbidity current recurrence is necessary for better understanding sediment, carbon, and pollutant fluxes and for designing infrastructure that is resilient to such flows. This study analyzes the timing and causes of 113 directly-monitored turbidity currents in a submarine channel located offshore from glacial-fed river deltas. A statistical model is developed to predict turbidity current probability based on river discharge and water level, which shows high success rates in predicting turbidity current activity in other river deltas.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yizhe Li, Youkou Dong, Gang Chen
Summary: This study aims to better understand the mechanisms of transforming debris flows into turbidity currents by simulating submarine landslide transportation processes using computational fluid dynamics. The two-phase mixture module is adopted to mimic the interactions between slurry and ambient water, and the rheological behaviors of the slurries are described using the Herschel-Bulkley model. Through a series of case studies, transformation rate formula coefficients are fitted, and it is demonstrated that the slurry is fully transformed into turbidity currents before deposition.
APPLIED SCIENCES-BASEL
(2023)
Article
Geosciences, Multidisciplinary
Elena Scacchia, Roberto Tinterri, Fabiano Gamberi
Summary: Overbank deposits serve as valuable records of flow through submarine channels. Previous models have assumed that the architecture of these deposits is primarily related to autogenic processes, but this study demonstrates that the interaction between different flow types and complex topography can profoundly influence deposition and resultant deposit geometry.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
Wenjie Li, Jitao Chen, Anne J. Hakim, Paul M. Myrow
Summary: The carbonate mass-transport deposits in western Inner Mongolia, China, offer a rare opportunity to study sedimentary processes, showcasing the transition from passive to foreland basin tectonics and associated geological events. These deposits provide insight into the emplacement history and spatial variations, serving as a template for interpreting ancient slope deposits that experienced passive to active tectonic transitions.
Article
Engineering, Geological
Yangming Chen, Lulu Zhang, Xin Wei, Jiabao Xu, Shixiao Fu, Chencong Liao
Summary: This paper proposes a distributed model for assessing the damage to a submarine pipeline network induced by regional debris flows. The model can capture the impact forces and damage level of the pipeline network during the debris flow process and investigates the influence of debris flow properties and multiple flows on the network.
ENGINEERING GEOLOGY
(2022)
Article
Energy & Fuels
Kun Xu, Shijia Chen, Jianbo Liao, Fan Yang, Jungang Lu, Xueting Wu, Chen Li
Summary: This article examines the seepage characteristics and differential accumulation of crude oil in Chang 6 sandy-debris-flow and turbidite-current sandstones in the Ordos Basin using physical simulation experiments. The results indicate that the flow of crude oil in these sandstones is nonlinear and quasilinear, with threshold pressure gradient and critical pressure gradient. The turbidite-current sandstones exhibit a leap in oil saturation with relatively low maximum oil saturation, while the sandy-debris-flow sandstones show steady growth with high maximum oil saturation. Differential accumulation of crude oil is influenced by porosity, permeability, crude oil viscosity, and hydrocarbon-generating pressure. To accumulate, the pressure gradient needs to surpass the critical pressure gradient, which occurs when the oil saturation exceeds 25%. Large-scale oil accumulation easily occurs in near-source sandy-debris-flow sandstones, whereas in far-source deep-water sandstones inauthentic oil accumulation is more likely.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Indranil Guha, Mark F. Randolph, David J. White
Summary: This technical note presents simplified parametric solutions for the axial response of surface-laid submarine pipelines subjected to axial drag from debris flows, highlighting the need to consider both normal and axial responses when assessing the impacts of debris flow on pipelines.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Oceanography
Linwei Ma, Shiguo Wu, Yanrui Liu, Jin Sun, Min Ouyang, Qingping Li, Yongpeng Qin, Dawei Wang
Summary: Research on the instability of continental slopes where submarine landslides usually occur is crucial to the risk evaluation of deepwater drilling and the safety of nearshore personnel. This study established a numerical model using bathymetric data from the Qiongdongnan Basin and conducted 3D slope stability analysis and static and dynamic analyses.
JOURNAL OF OCEAN UNIVERSITY OF CHINA
(2023)
Article
Geosciences, Multidisciplinary
Wei Li, Yan Li, Kamaldeen O. L. Omosanya, Tiago M. Alves, Song Jing, Xiujuan Wang, Nan Wu, Wenhuan Zhan
Summary: This study analyzes the morphological character of 123 megaclasts and proposes a new classification scheme based on their morphometric properties using high-quality, three-dimensional seismic reflection data from the deep-water Taranaki Basin offshore New Zealand. The megaclasts can be classified as undeformed, rotated, deformed, and highly deformed based on their internal deformational styles. The study demonstrates that quantitative parameterization of the megaclasts provides important information about their deformational processes and a more complete understanding of megaclast emplacement along continental margins.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Engineering, Geological
Jianting Du, Jiantao Yu, Clarence Edward Choi
Summary: Submarine debris flows pose a threat to offshore development. Existing experimental studies do not accurately simulate actual bed conditions, and recent experiments have shown that bed roughness and permeability play an important role in flow dynamics.
Article
Engineering, Marine
Enjin Zhao, Youkou Dong, Yuezhao Tang, Lan Cui
Summary: This study investigated the impact of submarine debris flow on underwater pipelines, considering various factors and exploring the effects of debris flow characteristics on pipelines. The study also proposed the correlations between different influencing factors.
Article
Geology
Davide Mencaroni, Roger Urgeles, Angelo Camerlenghi, Jaume Llopart, Jonathan Ford, Cristina Sanchez Serra, William Meservy, Eulalia Gracia, Michele Rebesco, Nevio Zitellini
Summary: This study investigates a deep-sea sediment deposit adjacent to a major canyon in the North Atlantic, revealing the interaction between the Mediterranean Outflow Water and turbidity currents flowing along the canyon. The results suggest that canyons deeper than the turbidity currents require an additional process to allow interaction with the Mediterranean Outflow Water and transport sediment out of the canyon. This interaction between turbidity currents and contour currents in canyons worldwide may require intermediate nepheloid layers to export the finer-grained fraction of turbidity currents at the boundary between major water masses.
Article
Geosciences, Multidisciplinary
Philip R. Hill, D. Gwyn Lintern
Summary: This study reports on the direct measurement of turbidity currents on the Fraser delta slope and compares their dynamics with turbidity currents in channelized settings. The measurements showed that most turbidity currents have speeds exceeding 1.5 m/s, and the duration is inversely proportional to the transit speed. The initial stage of the flow is highly variable and the velocity structure is consistent with previous observations. The presence of a thick, dense basal layer suggests limited runout distances for open slope flows. Shallow gullies may play a role in the initiation and ignition of the unconfined flows.