Article
Engineering, Marine
Zhuangcai Tian, Yonggang Jia, Qizhi Du, Shaotong Zhang, Xiujun Guo, Wenwen Tian, Mingwei Zhang, Lei Song
Summary: This study investigates the direct interaction between internal solitary waves (ISWs) and seabed sediments through flume experiments and field observations. The results show that ISWs exert significant horizontal and vertical shearing stresses, potentially leading to seabed damage. This research may contribute to a better understanding of seabed damage caused by ISWs and serve as a reference for future field experiment designs.
Article
Mechanics
Marco Mazzuoli, Giovanna Vittori, Paolo Blondeaux
Summary: The dynamics of sediment grains picked-up from the seabed and dragged by the oscillatory flow induced by wind waves close to the bottom is investigated. Particle-resolved direct numerical simulations are used to analyze the flow field and trajectories of spherical particles mimicking the sediment grains. The study reveals the presence of turbulent regime and explicit computation of interaction between turbulent eddies and small vortex structures shed by sediment particles.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2022)
Article
Environmental Sciences
Mirco Mancini, Teresa Serra, Jordi Colomer, Luca Solari
Summary: Microplastic particles (MP) are a growing concern for aquatic ecosystems due to increased plastic manufacture. The transport and dispersion mechanisms of MP in aquatic environments are not well understood. This study investigated the transport of MP under a unidirectional flow in a laboratory setting. The presence of sediment increased the vertical transport of MP to the bottom, with higher sediment concentrations resulting in greater downward flux of MP. The scavenging of MP by sediment particles led to differential settling patterns, potentially increasing the presence of MP near their sources.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Mechanics
Sanjay Kumar Mohanty
Summary: This manuscript analyzes the time-dependent capillary gravity wave motion in the presence of a current and an undulated permeable bottom. The reflection and transmission coefficients due to the small bottom undulation are obtained using different methods. It is found that wave energy propagates faster for larger values of the Froude number. The study also verifies wave energy propagation characteristics through simulations and spectral methods.
Article
Geology
Wei Li, Shuang Li, Tiago M. Alves, Michele Rebesco, Yingci Feng
Summary: The study utilized high-resolution bathymetric and seismic data to investigate the morphology of a submarine canyon (Taiwan Canyon) in the northeast South China Sea, revealing asymmetrical banks and sediment wave fields. Different sources of turbidity currents entering the canyon led to distinct depositional features, contributing to a better understanding of submarine canyon evolution and formation.
Article
Mechanics
A. Doak, R. Barros, P. A. Milewski
Summary: In this paper, mode-2 solitary waves in a three-layer stratified flow model are investigated. Localised traveling wave solutions to both the fully nonlinear problem and the three-layer Miyata-Choi-Camassa equations are found and compared. The existence of mode-2 embedded solitary waves and branches of mode-2 solitary waves with speeds beyond the mode-1 linear waves are shown. Additionally, the relationship between large amplitude embedded solitary waves and conjugate states of the problem is demonstrated.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Environmental
Kewei Chen, Xingyuan Chen, James C. Stegen, Jorge A. Villa, Gil Bohrer, Xuehang Song, Kuang-Yu Chang, Matthew Kaufman, Xiuyu Liang, Zhiling Guo, Eric E. Roden, Chunmiao Zheng
Summary: CH4 emissions from inland waters, especially streams and rivers, are uncertain due to the lack of mechanistic understanding. Previous studies have attributed the spatiotemporal heterogeneity of riverine CH4 to environmental factors, but the underlying mechanisms remain unclear.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geology
Sten-Andreas Grundvag, William Helland-Hansen, Erik P. Johannessen, Joris Eggenhuisen, Florian Pohl, Yvonne Spychala
Summary: This study presents sedimentological evidence of sandy hyperpycnal flow deposits (hyperpycnites) in a series of basin floor lobe complexes associated with a progradational shelf margin in the Eocene of Spitsbergen, Arctic Norway. The abundance of thick-bedded massive sandstones, frequent bed amalgamation, and the distribution of hyperpycnites across the lobes suggest that hyperpycnal flow was the most important mechanism driving lobe progradation. These findings challenge the traditional beliefs about hyperpycnites preserving the waxing-waning signal of single-peaked floods.
Article
Mechanics
Francesco Tosto, Claudio Lettieri, Matteo Pini, Piero Colonna
Summary: The study of paradigmatic compressible one-dimensional flows provides insights into the loss mechanisms of fluid machinery components in power and propulsion systems. The research shows that in Rayleigh flows, energy is converted, while entropy is generated in Fanno flows due to friction. Molecular complexity and thermodynamic state significantly impact the performance of the working fluid.
Article
Geosciences, Multidisciplinary
Jingxiang Guo, Zaixing Jiang, Xiangyang Xie, Chao Liang, Wenwen Wang, Arthur B. Busbey, Chaochen Jia, Jiayi Meng
Summary: This study investigates the facies types, distribution, and controlling factors of sediment gravity-flow deposits on stepped slopes at deep-lacustrine basin margins in China. The interaction between paleotopography and lake level fluctuations is considered a direct control on the morphology, pattern, and spatial-temporal distribution of channel-lobe complexes in the study area.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Environmental Sciences
Martina Pierdomenico, Domenico Ridente, Daniele Casalbore, Letizia Di Bella, Salvatore Milli, Francesco Latino Chiocci
Summary: This study reports evidence of macroplastic burial in sediments collected at the mouth of a river. The findings suggest the potential of sedimentary flows in burying plastic debris at depth below the seafloor, particularly in nearshore delta environments. The study also raises questions about the magnitude of macroplastic storage in the subsurface and the lack of specific devices and strategies for their reckoning.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Marine
Zhiguo He, Baoxin Xu, Samuel Ukpong Okon, Li Li
Summary: In this study, the generation and maintenance of sediment hyperpycnal flow in the Yellow River Estuary were investigated using a numerical model. The results showed that high suspended sediment concentration and tidal cycles are important factors in the formation and characteristics of the hyperpycnal flow.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geochemistry & Geophysics
J. Gomberg, K. Ariyoshi, S. Hautala, H. P. Johnson
Summary: This study utilizes data measured by the DONET system in the Nankai Earthquake Zone to explore seismic shaking-triggered sediment slope failures and gravity flows. Although the experiment did not provide evidence that earthquake shaking initiated these phenomena, the research offers valuable lessons and inputs for future studies in this field.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Physics, Multidisciplinary
Kun Zhang, Ya-Xian Fan, Lan-Lan Xu, Ting Liu, Huan Liu, Zhi-Yong Tao
Summary: A tunable flat-top broadband defect mode in the terahertz frequency range is proposed by inserting multiple defects into a periodic waveguide, resulting in a bandwidth of 38.3 GHz, over 21 times that of traditional defect modes. The broadband defect mode is attributed to the competition between Bragg scattering and local resonances in the coupling of multiple defect modes, providing potential applications in various THz systems as functional devices.
Article
Oceanography
Eiji Masunaga, Matthew H. Alford, Andrew J. Lucas, Andrea Rodriguez-Marin Freudmann
Summary: This study investigates the dynamics of internal tides in La Jolla Canyon, California, using a high-resolution numerical model. The results reveal energy convergence and mixing in the canyon, as well as reflection of internal tide energy back offshore, leading to the formation of standing internal waves. This study provides important insights into the dynamics and energy budgets of internal tides in submarine canyons.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Geochemistry & Geophysics
Andrey Babeyko, Stefano Lorito, Francisco Hernandez, Joern Lauterjungl, Finn Lovholt, Alexander Rudloff, Mathilde Sorensen, Alexey Androsov, Inigo Aniel-Quiroga, Alberto Armigliato, Maria Ana Baptista, Enrico Baglione, Roberto Basili, Joern Behrens, Beatriz Brizuela, Sergio Brunie, M. Didem Cambaz, Juan Cantavella-Nadal, Fernando Carrilho, Ian Chandler, Denis Chang-Seng, Marinos Charalampakis, Lorenzo Cugliari, Clea Denamiel, Gozde Guney Dogan, Gaetano Festa, David Fuhrman, Alice-Agnes Gabriel, Pauline Galea, Steven J. Gibbons, Mauricio Gonzalez, Laura Graziani, Marc-Andre Gutscher, Sven Harig, Helen Hebert, Constantin Ionescu, Fatemeh Jalayer, Nikos Kalligeris, Utku Kanoglu, Piero Lanucara, Jorge Macias Sanchez, Shane Murphy, Ocal Necmioglu, Rachid Omira, Gerassimos A. Papadopoulos, Raphael Paris, Fabrizio Romano, Tiziana Rossetto, Jacopo Selva, Antonio Scala, Roberto Tonini, Konstantinos Trevlopoulos, Ioanna Triantafyllou, Roger Urgeles, Roberto Vallone, Ivica Vilibic, Manuela Volpe, Ahmet C. Yalciner
Summary: The European tsunami community has attained the status of Candidate Thematic Core Service (cTCS) within the European Plate Observing System (EPOS), providing support and a platform for tsunami research and risk management. The cTCS will address the needs in tsunami science and risk mitigation through four thematic pillars.
ANNALS OF GEOPHYSICS
(2022)
Article
Geography, Physical
Meril Merindol, Guillaume St-Onge, Nabil Sultan, Patrick Lajeunesse, Sebastien Garziglia
Summary: The Charlevoix-Kamouraska/Bas-Saint-Laurent (CKBSL) seismic zone in eastern Canada has a seismic hazard similar to that of the active Pacific zone. A major earthquake in 1663 triggered numerous submarine landslides in the St. Lawrence Estuary, indicating a relationship between earthquakes and submarine slope failures. Analysis of sediment cores and dating techniques revealed four periods of synchronous submarine landslides corresponding to strong historical earthquakes, with the event in 1663 being the most significant in the region in the past two millennia.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Senay Horozal, Jang-Jun Bahk, Deniz Cukur, Roger Urgeles, David M. Buchs, Sang Hoon Lee, In -Kwon Um, Seong-Pil Kim
Summary: By analyzing 2-D multi-channel seismic reflection data, multibeam bathymetry, and deep drilling data, researchers have identified and characterized glide planes associated with submarine landslides in the Ulleung Basin margins, East Sea. These glide planes developed at the interface between clay-rich sediment and biogenic diatom-rich sediments, and are influenced by climate-modulated factors. The study also documents different post-failure behaviors of the landslides and highlights the complex interplay of climate, volcanic activity, and tectonics in controlling the formation of weak layers.
Review
Oceanography
Claude Estournel, Guillaume Mikolajczak, Caroline Ulses, Francois Bourrin, Miquel Canals, Sabine Charmasson, David Doxaran, Thomas Duhaut, Xavier Durrieu de Madron, Patrick Marsaleix, Albert Palanques, Pere Puig, Olivier Radakovitch, Anna Sanchez-Vidal, Romaric Verney
Summary: A simulation was conducted to study sediment transport, erosion and deposition in the Gulf of Lion. The simulation compared simulated and observed data to assess reliability. The results showed sediment accumulation near the Rhone River mouth, accretion along the mid-shelf mud belt, and the impact of dense shelf water cascading on sediment resuspension and erosion. The study found an unbalanced sedimentary system with a deficit mainly over the inner shelf due to reduced inputs from the Rhone River.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Geology
N. Sultan, G. Jouet, V. Riboulot, M. Terzariol, S. Garziglia, A. Cattaneo, J. Giraudeau, S. J. Jorry
Summary: Understanding and quantifying the hazards related to earthquake-induced submarine liquefaction and landslides is crucial for tropical volcanic-carbonate islands. This study focused on the eastern side of Mayotte and found that low-density layers with high calcite content are the main control on liquefaction potential. The relationship between the cyclic resistance of sediment and its density and magnetic susceptibility provides a time-effective approach for identifying liquefaction hazards.
Article
Geosciences, Multidisciplinary
Elise Vissenaekens, Katell Guizien, Xavier Durrieu de Madron, Ivane Pairaud, Yann Leredde, Pere Puig, Francois Bourrin
Summary: This study aims to assess the accuracy of a coastal circulation model in predicting flow speed by comparing it with field observations. The results show that the model performs better in predicting flow speed at shallow stations compared to deep stations. However, there is a low correlation between simulated and observed flow speed at all stations.
JOURNAL OF MARINE SYSTEMS
(2023)
Article
Geology
Henriette Wilckens, Tilmann Schwenk, Thomas Ludmann, Christian Betzler, Wenyan Zhang, Jiayue Chen, F. Javier Hernandez-Molina, Alice Lefebvre, Antonio Cattaneo, Volkhard Spiess, Elda Miramontes
Summary: The aim of this study is to improve the understanding of the interaction between sedimentary systems and oceanographic processes in deep-water environments. By analyzing a large number of cross-sections of moat-drift systems from different locations worldwide, as well as in situ measured current data, the study provides new insights into the link between moat-drift system morphology and bottom current dynamics. Findings show that the slope angle and drift angle of bottom currents have an impact on the morphology of moat-drift systems.
Article
Geochemistry & Geophysics
A. Plaza-Faverola, N. Sultan, R. G. Lucchi, N. El Bani Altuna, H. Ramachandran, S. Singhroha, F. Cooke, S. Vadakkepuliyambatta, M. M. Ezat, T. L. Rasmussen
Summary: Gas transport in deep ocean environments is controlled by pressure regime and can occur through pores, faults, fractures, and diffusion. This study examines the pressure conditions along the Vestnesa Ridge in the Fram Strait using piezometer data, geotechnical tests, and sediment core analyses. The results show a decrease in induced pore pressure and sediment stiffness upon piezometer penetration, suggesting a mechanical damage to the upper sediment layers due to variations in gas diffusion rates and exsolution. These findings, along with geophysical data and sediment core analyses, indicate a shift from advection-dominated to diffusion-dominated fluid flow system, influenced by sedimentary faults. Understanding gas transport mechanisms is important for studying gas hydrate inventories, seepage phenomena, and sediment deformations in deep ocean settings.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Frances Cooke, Andreia Plaza-Faverola, Stefan Bunz, Nabil Sultan, Hariharan Ramachandran, Heather Bedle, Henry Patton, Sunny Singhroha, Jochen Knies
Summary: This study investigates the spatial and temporal evolution of fractures and fluid flow features in the west of the Vestnesa Ridge. It reveals two highly deformed stratigraphic intervals and associated small-scale pockmarks. These periods of deformation are associated with seismic anomalies potentially correlated with buried methane-derived authigenic carbonate.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geology
Derek E. Sawyer, Roger Urgeles, Claudio Lo Iacono
Summary: Megabeds are large submarine deposits that originate from single catastrophic events and have significant implications for geohazards. We discovered four megabeds in the western Marsili Basin, Tyrrhenian Sea, deposited within the past 50 k.y. The megabeds are composed of volcaniclastic sand, mud, and debris flow, and were sourced from the Campanian volcanic province. The discovery reveals significant geohazard events for the coastlines around the Tyrrhenian Sea with a recurrence interval of about 10-15 k.y.
Article
Environmental Sciences
Meri Bilan, Andrea Gori, Jordi Grinyo, Marina Biel-Cabanelas, Xenia Puigcerver-Segarra, Andreu Santin, Stefano Piraino, Sergio Rossi, Pere Puig
Summary: Bottom trawling has both direct and indirect impacts on cold-water coral communities, and the indirect impact can contribute to the simplification of community structure.
MARINE POLLUTION BULLETIN
(2023)
Article
Fisheries
Estefania Rodriguez, Sophia Collins, Jordi Grinyo, Pere Puig
Summary: This study describes a new species of sea anemone found in the cold-water coral environments of Blanes Canyon in the northwestern Mediterranean Sea. The new species, Litophellia enoplosa sp. nov., has distinct characteristics that differentiate it from other species, such as the cuticle on the column and size ranges of the cnidae.
MEDITERRANEAN MARINE SCIENCE
(2023)
Article
Geography, Physical
V Coussin, A. Penaud, N. Combourieu-Nebout, O. Peyron, M. A. Sicre, N. Tisnerat-Laborde, A. Cattaneo, N. Babonneau
Summary: The study examines the past and present environmental conditions along the Algerian coast, highlighting the interactions between the atmosphere, hydrosphere, biosphere, and human activities. By analyzing various proxies, the research reveals the links between sea surface hydrological conditions and regional environmental changes on nearby watersheds.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Environmental Sciences
Ruth Duran, Pere Puig, Sarah Paradis, Jorge Guillen, Albert Palanques, Claudio Lo Iacono, Marta Arjona-Camas, Araceli Munoz, Aaron Micallef
Summary: Bottom trawling can cause measurable changes in seafloor morphology and surface sediment composition, resulting in large-scale erosive features and increased sand content. The impact of this fishing method on the seabed can be observed through high-resolution multibeam data and side scan sonar, and the recovery period after trawling activities can be long.
FRONTIERS IN MARINE SCIENCE
(2023)
