Article
Geochemistry & Geophysics
Roy Jaijel, Eli Biton, Yishai Weinstein, Tal Ozer, Timor Katz
Summary: Most in-situ studies and observations of turbidity currents have been conducted in large submarine canyons near big rivers, while little research has been done in small submarine canyons farther offshore. This study focuses on Bat-Galim Canyon, a small submarine canyon located offshore Haifa, Israel, which is fed by minor and ephemeral streams. Measurements were collected using mooring stations in the canyon, revealing that the canyon serves as an active conduit for sediment transport via turbidity currents, with similar characteristics to larger canyons. The study also found temperature inversions during these events, which have implications for water column processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Mechanics
Zhuangcai Tian, Yonggang Jia, Jiangxin Chen, J. Paul Liu, Shaotong Zhang, Chunsheng Ji, Xiaolei Liu, Hongxian Shan, Xuefa Shi, Jiwei Tian
Summary: The study reveals that internal solitary waves (ISWs) in deep sea (>1000 m) can cause sediment resuspension and seafloor geomorphic changes, with a maximum resuspension depth of 1500 m. ISWs have a greater impact on water depths less than or similar to 1000 m, shaping the seabed and controlling sediment distribution patterns on the Dongsha continental slope.
Article
Geosciences, Multidisciplinary
Mingen Liang, Jing Liu, Yitong Lin, Zixiao He, Wen Wei, Liangwen Jia
Summary: Understanding suspended sediment processes in the mouth-bar region during typhoons is important for estuarine geomorphic prediction. An observation system was used to explore suspended sediment dynamics during Typhoon Higos in the Modaomen Estuary. Results showed that suspended sediment concentrations during typhoons can be 30 times larger than normal conditions, primarily due to sediment resuspension induced by typhoon waves. The dynamics of suspended sediment varied depending on the dominant flows in the mouth-bar region, either being influenced by wind-driven flow and ebb surge transport combined with river flooding or tidal processes.
Article
Geosciences, Multidisciplinary
Yintao Lu, Boqing Shi, Vittorio Maselli, Xiwu Luan, Xiaoyong Xu, Dali Shao, Guozhang Fan, Haiqiang Wang, Liangbo Ding
Summary: This study investigates how sediment gravity flows contribute to the evolution of the lower continental slope of the Myanmar margin. Seafloor and subseafloor data show large sediment wave fields, chaotic units, and debrites on both flanks of an extensive submarine canyon.
Article
Environmental Sciences
Daniel J. Nowacki, Andrew W. Stevens, Renee K. Takesue, Eric E. Grossman
Summary: The sequence and timing of sediment delivery and redistribution in coastal systems is crucial for shoreline stability, ecosystem services, and remediation planning. This study explores the sediment dynamics and the coupling between fluvial and oceanographic processes in Bellingham Bay, an urban estuary in Washington, USA, using multiple time-scale observations. The findings provide important insights for understanding the fate of contaminants, predicting long-term delta morphological evolution, and informing coastal restoration efforts.
ESTUARIES AND COASTS
(2023)
Article
Multidisciplinary Sciences
Rajesh K. Mahato, Sk Zeeshan Ali, Subhasish Dey
Summary: We investigate the growth rate, resonant wavenumber, and phase velocity of longitudinal sediment waves generated by the interaction of turbidity currents with an erodible bed through linear and weakly nonlinear stability analyses. The study reveals the influence of key parameters on these quantities and the migration of sediment waves. A stability diagram accurately captures experimental data within the unstable zone. The weakly nonlinear analysis provides the equilibrium amplitude of sediment waves and its sensitivity to key parameters, with results comparable to field observations.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Engineering, Marine
Ryan J. K. Dunn, Jordan Glen, Hsin-Hui Lin, Sasha Zigic
Summary: The study examines the dynamics of suspended particulate matter (SPM) in Port Curtis estuary, Australia, utilizing the LISST instrument. The results show significant spatial and temporal trends in SPM sizes and concentrations, influenced by variable energy conditions on neap and spring tide cycles. Findings highlight the important influence of tidal regimes on SPM dynamics in estuarine environments.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Jiafeng Xie, Chenlin Zhu, Peng Hu, Zhaosheng Yu, Dingyi Pan
Summary: Multigrain/polydispersity has a significant impact on turbidity currents, but the understanding of fluid-particle interactions is still limited. In this study, a computational fluid dynamics-discrete element method model was used to investigate the dynamics of bidisperse lock-exchange turbidity currents. The results showed that bidisperse transport and fine component transport can be distinguished during the evolution of the bidisperse turbidity current. Bidisperse segregation alters the collision process between dispersed phases, and the transport of fine particles is inhibited by both the lift force and the contact force produced by collision.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mechanics
Jiafeng Xie, Peng Hu, Chenlin Zhu, Zhaosheng Yu, Thomas Pahtz
Summary: In this study, a large-eddy simulation and discrete element method coupled model is used to investigate the auto-suspension mechanism of particle-laden gravity currents over an inclined slope. The results show that the auto-suspension particles are mainly concentrated near the current head and their number increases and then decreases during the current evolution. Increasing the particle concentration enhances the flow velocity and improves the auto-suspension capacity, while increasing the slope angle slightly increases the velocity of the current head without significant effect on the total force.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Environmental Sciences
Mauricio Andrades Paixao, Masato Kobiyama, Cristiano Poleto, Luca Mao, Itzayana Gonzalez Avila, Hiroshi Takebayashi, Masaharu Fujita
Summary: This study aims to understand the relationship between morphology, topography, and local sediments in a canyon river in Southern Brazil. Topobathymetric data were obtained during a field survey, and the results suggest that sediment supply is an essential characteristic of the canyon's influence on river morphology. The study also found that the influence of the canyon on river characteristics weaken from upstream to downstream.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Review
Mechanics
Thomas Peacock, Raphael Ouillon
Summary: The evolution and fate of sediment plumes in the deep sea mining industry are determined by transport processes, which require more fundamental and applied fluid mechanics research for accurate prediction. Efforts combining theory, modeling, experiments, and trials have made progress in assessing the role of parameters in setting the extent of plumes, but there are currently no established best practices for the design and operation of mining technologies.
ANNUAL REVIEW OF FLUID MECHANICS
(2023)
Article
Environmental Sciences
Chao Liu, Yuqi Shan, Heidi Nepf
Summary: Laboratory experiments showed that model vegetation has a significant impact on turbulence and resuspension, with vegetation-generated turbulence dominating within canopies. The critical turbulent kinetic energy and velocity for resuspension initiation were found to be independent of stem diameter.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Ilwon Jeong, Yonguk Ryu, Seung Yun Nam, In-Cheol Lee, Kyunghoi Kim
Summary: This study investigates the physicochemical suppression of calcium on sediment resuspension. The results show that calcium can suppress sediment resuspension by changing sediment properties, enhancing erosion resistance, and decreasing suspended sediment concentrations.
MARINE POLLUTION BULLETIN
(2022)
Article
Biodiversity Conservation
Yuting Li, Zhiyao Song, Ruijie Li, Peng Chen, Xiufeng Quan
Summary: This study aims to propose a new method and model to improve the accuracy of suspended sediment concentration (SSC) in estuarine and coastal waters. The model, based on hydrodynamic factors, functional principles, and dimensional evaluation methods, can analyze the effects of horizontal convective transport and vertical suspended upward movement on SSC.
ECOLOGICAL INDICATORS
(2023)
Article
Marine & Freshwater Biology
Jun Young Seo, Yong Hoon Kim, Jongseong Ryu, Ho Kyung Ha
Summary: In this study, the researchers used acoustic Doppler current profilers to investigate the mechanisms of water and sediment transport in Onsan Bay. They found that water circulation in the bay was influenced by freshwater discharge from the river and exchange with the open sea, as well as by wind-induced currents. The sediment transport within the bay was mainly controlled by estuarine residual circulation, and frequent resuspension events contributed to an increase in sediment concentration. Considering the prevailing winds in the area, sedimentation is expected to persist in Onsan Bay.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)