Review
Engineering, Chemical
Zhaokai Hou, Yuan Yuan, Ye Chen, Enyuan Jiang, Huaishan Wang, Xu Zhang
Summary: This study analyzes the factors affecting the settling rate of particles and summarizes the current issues and development direction in particle settling rate research. The study found that factors such as wall effect, fluid rheology, particle shape irregularity, and particle concentration can affect the settling rate of particles.
Article
Energy & Fuels
Tie Yan, Jing-Yu Qu, Xiao-Feng Sun, Wei Li, Ye Chen, Qiao-Bo Hu
Summary: This study experimentally investigated the drag coefficient and settling velocity of drill cuttings in different types of fluids, establishing predictive models that accurately predict the settling velocity in power-law and Herschel-Bulkley fluids with mean relative errors of 5.03% and 6.74%, respectively, verifying the accuracy of the models.
Article
Construction & Building Technology
Cong Zeng, Yang Chen, Xuefeng Yan
Summary: This research aims to establish a method to calculate the critical flow velocity of the cutting-mud mixture and friction loss in the transportation process. The proposed calculation method was validated using a medium-scale reverse-circulation reaming system, showing its feasibility and suitability in determining the critical design parameters.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Kristian Spilling, Malte Heinemann, Mari Vanharanta, Moritz Baumann, Andrea Noche-Ferreira, Philipp Suessle, Ulf Riebesell
Summary: Recent studies have shown a connection between sinking speed and respiration rates of marine aggregates. Slower sinking aggregates have higher and more variable respiration rates, possibly due to their higher porosity.
Article
Geochemistry & Geophysics
M. Kitamura, T. Hirose, X. Lei
Summary: This study determined the V-p-C-0 relationship in the Nankai accretionary prism down to around 3.2 km, revealing that sediments in this area tend to be weaker than estimated by other empirically determined V-p-C-0 relationships. Additionally, the study found that V-p generally increased with decreasing porosity in the accretionary prism sediments.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Energy & Fuels
Xiaofeng Sun, Minghao Sun, Zijian Li
Summary: Accurately predicting the drag coefficient and settling velocity of drill cuttings in non-Newtonian drilling fluid is of great significance in the drilling industry. This study conducted experimental research on particle settlement velocity and established prediction models for both spherical and irregular-shaped cuttings in non-Newtonian fluid, achieving high prediction accuracy.
Article
Energy & Fuels
Mamane Kondo Issoufou, Xianzhi Song, Zhaopeng Zhu, Zhengming Xu, Buwen Yu, Silin Jing, Shiming Duan
Summary: This paper investigates the settling velocity of cuttings in drilling muds with rising bubbles, proposing a prediction model for both scenarios. The study reveals that bubble-particle collision in viscous fluids can decrease settling velocity by 20%-50%, while interactions with gas can increase it by two or three times compared to gas-free muds. Additionally, findings suggest that maintaining solid particles in suspension in water with gas volume less than 7.5% can significantly impact settling velocity.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Oceanography
Yue Yu, Deqi Xiong, Zhixin Qi, Wenxin Li, Ruiyang Sun, Sinan Fu
Summary: Understanding the interaction between oil droplets and suspended particulate matter is crucial for sunken oil modeling and emergency response. This study investigated the effects of mixing time and energy, oil type, and sediment concentration and size on the properties of oil-particle aggregates (OPAs). The results showed that high mixing energy resulted in higher oil and particle loads in OPAs. Under turbulent hydrodynamics, moderately viscous oils formed OPAs more easily and sank rapidly. Higher sediment concentration increased the density and oil capacity of OPAs.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Marine
Zaiyang Zhou, Jianzhong Ge, Dirk Sebastiaan van Maren, Jinghua Gu, Pingxing Ding, Zhengbing Wang
Summary: This study develops a simplified method to measure erosion and deposition parameters at a water-bed interface and applies it to observations in the Changjiang estuary. It also proposes a visual diagram to illustrate the interdependency of erosion and deposition parameters.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jialin Tian, Changyue Fan, Lai Wei, Yanzhi Wang
Summary: The research establishes the differential equation for drill string whirling and deduces the critical whirling speed equation, taking into account factors such as drill string wall thickness, tension, drilling depth, and drilling fluid flow rate. It is found that the drill string has a critical whirling speed when n <= 8324, and no critical speed when n > 8324. The critical whirling velocity decreases with increased wall thickness and drilling depth.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Multidisciplinary Sciences
Nestor Arandia-Gorostidi, Hugo Berthelot, Federica Calabrese, Hryhoriy Stryhanyuk, Isabell Klawonn, Morten Iversen, Nurun Nahar, Hans-Peter Grossart, Helle Ploug, Niculina Musat
Summary: This study reveals the importance of bacteria colonization on sinking diatom aggregates for carbon and nitrogen cycling. The results suggest that different bacterial groups have varying levels of carbon and nitrogen uptake from diatoms, with Alteromonas group showing a competitive advantage in nitrogen-limited deep-sea environments.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Manoel Lucas Machado Xavier, Johannes Gerson Janzen, Heidi Nepf
Summary: This study investigates the interactions within floating treatment island (FTI) systems using computational fluid dynamics (CFD) modeling. The findings demonstrate that FTIs significantly influence flow patterns and mass removal, with the positioning and configuration of FTIs playing a crucial role.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Shuyan Wang, Lin Li, Baoli Shao, Zihan Yuan, Lei Xie, Jiawei Fan
Summary: This study analyzes the effects of drill pipe rotating speed and inlet velocity of drilling fluid on the efficiency of cuttings migration by simulating the migration of cuttings carried by drilling fluid. The results show that within certain limits, increasing the rotational speed of the drill pipe and the inlet velocity of the drilling fluid can reduce the height of the cuttings bed and improve the efficiency of cuttings migration. Increasing the inlet velocity of the drilling fluid has a more positive effect on cuttings migration in inclined wellbores, while increasing rotational speed is more beneficial for improving the efficiency of cuttings migration in horizontal wellbores.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Bismark Odum, Chunyang Xu, Yongping Chen, Yinpeng Yao, Yan Zhou
Summary: The flocculation of cohesive sediment particles is influenced by the collision efficiency, which is mainly affected by local flow hydrodynamics. This study examined the hydrodynamic characteristics in a stirred tank and analyzed the impact on floc and settling properties. The results show that the local dissipation rate of TKE and turbulent intensity states significantly influence floc size and distribution. Moreover, the hydrodynamic conditions also affect the settling velocity and fractal dimension of flocs.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2023)
Review
Mechanics
Yilong Liu, Xiping Yu
Summary: This paper reviews the research published in the past century on the drag force acting on an assemblage of particles moving relative to its carrier fluid. It summarizes representative results valid in each flow regime and verifies existing formulas for the drag coefficient while establishing a new one. The new formula is shown to be more accurate than others and converges to established laws and cases under different conditions.
Article
Oceanography
Ruiju Tong, Autun Purser, Janine Guinan, Vikram Unnithan, Jinsongdi Yu, Chengcheng Zhang
CONTINENTAL SHELF RESEARCH
(2016)
Letter
Biochemistry & Molecular Biology
Autun Purser, Yann Marcon, Henk-Jan T. Hoving, Michael Vecchione, Uwe Piatkowski, Deborah Eason, Hartmut Bluhm, Antje Boetius
Article
Multidisciplinary Sciences
Damianos Chatzievangelou, Carolina Doya, Laurenz Thomsen, Autun Purser, Jacopo Aguzzi
Article
Oceanography
Autun Purser, Covadonga Orejas, Andrea Gori, Ruiju Tong, Vikram Unnithan, Laurenz Thomsen
CONTINENTAL SHELF RESEARCH
(2013)
Article
Ecology
Ruiju Tong, Autun Purser, Janine Guinan, Vikram Unnithan
ECOLOGICAL INFORMATICS
(2013)
Article
Marine & Freshwater Biology
Autun Purser, Covadonga Orejas, Annika Moje, Laurenz Thomsen
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
(2014)
Editorial Material
Environmental Sciences
Autun Purser, Laurenz Thomsen
MARINE POLLUTION BULLETIN
(2012)
Article
Environmental Sciences
Elke Allers, Raeid M. M. Abed, Laura M. Wehrmann, Tao Wang, Ann I. Larsson, Autun Purser, Dirk de Beer
MARINE POLLUTION BULLETIN
(2013)
Article
Environmental Sciences
Ann I. Larsson, Dick van Oevelen, Autun Purser, Laurenz Thomsen
MARINE POLLUTION BULLETIN
(2013)
Article
Environmental Sciences
Olav Rune Godo, Jarle Klungsoyr, Sonnich Meier, Eirik Tenningen, Autun Purser, Laurenz Thomsen
MARINE POLLUTION BULLETIN
(2014)
Article
Multidisciplinary Sciences
Timm Schoening, Melanie Bergmann, Joerg Ontrup, James Taylor, Jennifer Dannheim, Julian Gutt, Autun Purser, Tim W. Nattkemper
Article
Multidisciplinary Sciences
Christopher K. Pham, Eva Ramirez-Llodra, Claudia H. S. Alt, Teresa Amaro, Melanie Bergmann, Miquel Canals, Joan B. Company, Jaime Davies, Gerard Duineveld, Francois Galgani, Kerry L. Howell, Veerle A. I. Huvenne, Eduardo Isidro, Daniel O. B. Jones, Galderic Lastras, Telmo Morato, Jose Nuno Gomes-Pereira, Autun Purser, Heather Stewart, Ines Tojeira, Xavier Tubau, David Van Rooij, Paul A. Tyler
Article
Multidisciplinary Sciences
Autun Purser
Proceedings Paper
Computer Science, Information Systems
Ruiju Tong, Autun Purser, Vikram Unnithan, Jinsongdi Yu
2015 23RD INTERNATIONAL CONFERENCE ON GEOINFORMATICS
(2015)
Proceedings Paper
Engineering, Marine
Laurenz Thomsen, Autun Purser, Sascha Floegel, Tom Kwasnitschka, Olaf Pfannkuche, Jakob Schwendner, Alexander Duda, Detlef Wilder, Roland Rosta
OCEANS 2015 - GENOVA
(2015)
Article
Environmental Sciences
Atefeh Zendehboudi, Azam Mohammadi, Sina Dobaradaran, Gabriel E. De-la-Torre, Bahman Ramavandi, Seyed Enayat Hashemi, Reza Saeedi, Emran Moradpour Tayebi, Ahmad Vafaee, Amirhossein Darabi
Summary: This study investigated the characteristics and ecological risks of microplastics (MPs) in ballast water for the first time, and found high levels of MP pollution. These findings contribute to our understanding of the sources and risks of microplastics in marine ecosystems.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Rose Boahemaa Pinto, Linda Bogerd, Martine van der Ploeg, Kwame Duah, Remko Uijlenhoet, Tim H. M. van Emmerik
Summary: Catchment-scale plastic pollution assessments provide insights into the sources, sinks, and pathways of plastic pollution. We propose an approach to quantify macroplastic transport and density in the Odaw catchment, Ghana, and find that the urban riverine zone has the highest transport, while the urban tidal zone has the highest riverbank and land macroplastic density.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Aliya Baidourela, Qian Sun, Gongxin Yang, Umut Halik, Zhongkai Dong, Kaixu Cai, Guili Sun, Wenya Zhang, Sisi Cheng
Summary: The study focused on heavy metal pollution in the green vegetation of a suburban industrial area in Tuokexun County, Xinjiang, China. The results showed that the overall level of heavy metal pollution in the soil was minor, with mercury (Hg) being the most severe contamination, likely caused by human activities. The composition of heavy metal elements in trees was more stable compared to grass and shrubs, with varying concentrations across different vegetation. Shrubbery was found to be the most effective in heavy metal restoration, and there were disparities in heavy metal enrichment among different vegetation types.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
James H. Bridson, Hayden Masterton, Beatrix Theobald, Regis Risani, Fraser Doake, Jessica A. Wallbank, Stefan D. M. Maday, Gavin Lear, Robert Abbel, Dawn A. Smith, Joanne M. Kingsbury, Olga Pantos, Grant L. Northcott, Sally Gaw
Summary: Plastic pollution has significant environmental impacts, largely due to chemical additives. However, the behavior of plastic additives in marine environments is not well understood. A marine deployment experiment was conducted to investigate the effects of weathering on the extractables profile of four types of plastics in New Zealand over a period of nine months. The concentration of additives in polyethylene and oxo-degradable polyethylene was strongly influenced by artificial weathering, while polyamide 6 and polyethylene terephthalate showed minimal change. These findings emphasize the importance of considering leaching and weathering effects on plastic composition when assessing the potential impact and risk of plastic pollution in receiving environments.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Alan G. Scarlett, Francis D. Spilsbury, Steven J. Rowland, Marthe Monique Gagnon, Kliti Grice
Summary: This study used diamondoid hydrocarbon distributions to identify the sources of environmental oil contamination. A suite of 20 diamondoids was found to accumulate in fish adipose tissue. The scatter plots of indices between fish and exposure oils showed a close to ideal 1:1 relationship, which can be used to determine the origin of the oil.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Shan Jiang, Mengmeng Wan, Kun Lin, Yanshan Chen, Rui Wang, Liju Tan, Jiangtao Wang
Summary: In this study, the concentration, composition, distribution, and sources of PCBs in surface seawater of the Bohai Bay were analyzed. The results showed that PCBs in the Bohai Bay had high concentrations and were primarily derived from land-based sources such as port activities and river inputs. The PCBs in the Bohai Bay may come from commercial PCBs and their incineration products, municipal landfills, wood and coal combustion, and industrial activities, etc.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Icaro S. A. Porto, Saulo V. A. Dantas, Caio S. A. Felix, Francisco A. S. Cunha, Jailson B. de Andrade, Sergio L. C. Ferreira
Summary: This study evaluated the risks of mercury levels in sardines consumed by low-income population in Salvador, Brazil. The results showed that the mercury content in the sampled sardines posed no risks to human health. This study is significant as most sardines in Salvador come from Todos os Santos Bay, which has a history of mercury contamination.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Jiahui Chen, Chengyu Yuan, Guanqun Zhai, Guangcheng Chen, Heng Zhu, Jun Liu, Yong Ye
Summary: This study investigated the combined influences of species selection and site elevation on greenhouse gas fluxes from restored mangrove soils. The results suggest that Avicennia marina should be selected for mangrove restoration to minimize carbon release and reduce the influence of greenhouse gas fluxes on the global greenhouse effect.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Emmanuel Onyeabor, Uju Obuka
Summary: The Gulf of Guinea region in Africa is a significant area for coastal countries, playing a vital role in their economic and environmental development. This study aims to reduce marine plastic pollution in the region by utilizing legal instruments.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Yuanli Liu, Stephan Luttjohann, Alvise Vianello, Claudia Lorenz, Fan Liu, Jes Vollertsen
Summary: Large area attenuated total reflectance-Fourier transform infrared spectroscopy (LAATR-FTIR) is a novel technique for detecting small microplastics, with limited accuracy for large microplastics. However, it shows promise in homogeneous matrices. The spectra quality is comparable between transmission mode and LAATR mode.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Phuc T. D. Le, Andrew M. Fischer, Britta D. Hardesty, Heidi J. Auman, Chris Wilcox
Summary: This study explores the relationship between ocean currents and the accumulation of floating marine debris (FMD) and finds that higher concentrations of FMD are associated with frontal frequencies (FF). FMD is primarily trapped in accumulation zones between fronts and the coastline, which have high biodiversity value.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Rosa Sawan, Perine Doyen, Florence Viudes, Rachid Amara, Celine Mahfouz
Summary: Few studies have examined the impact of urbanization and meteorological events on microplastics discharged into the sea through rivers. Surface water samples were collected from two Lebanese rivers, with differing degrees of urbanization, during dry and wet periods. The results showed that the most industrialized river had a significantly higher abundance of microplastics compared to the less-industrialized river. There was also a correlation between particle contamination and the season at each site, with microplastic concentrations highest on the first day of the wet season. These findings highlight the importance of considering meteorological events in accurately assessing plastic pollution influx into coastal waters.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Katherine R. Shaw, Jonathan L. Whitney, Eileen M. Nalley, Madeline C. Schmidbauer, Megan J. Donahue, Jesse Black, Raquel N. Corniuk, Kellie Teague, Rachel Sandquist, Catherine Pirkle, Rachel Dacks, Max Sudnovsky, Jennifer M. Lynch
Summary: This study examines the ingestion of plastic in reef fish in the Republic of the Marshall Islands. Plastic particles were found in the gastrointestinal tracts of multiple fish species. However, further analysis revealed that these particles were actually natural materials and posed no threat to human consumers.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Revati Hardikar, C. K. Haridevi, Shantaj Deshbhratar
Summary: This study investigated the variability in phytoplankton functional structure using a trait-based approach and explored the relationship between species traits and environmental factors, as well as their impact on ecosystem functioning. The results revealed that morphological traits, temperature, and ammonia played a decisive role in the seasonal succession of phytoplankton species. It was found that certain traits favored higher biomass production but might hinder energy transfer efficiency. The strong correlation between environmental variables and phytoplankton functional structure supports the practical implementation of a trait-based approach in studying phytoplankton community dynamics under different environmental conditions.
MARINE POLLUTION BULLETIN
(2024)
Article
Environmental Sciences
Engki A. Kisnarti, Nining Sari Ningsih, Mutiara R. Putri, Nani Hendiarti, Bernhard Mayer
Summary: This study examines the movement patterns of plastic marine debris in Indonesian waters, revealing that Indonesia contributes significantly to transboundary marine debris in the Pacific Ocean, Indian Ocean, and the South China Sea. Most of the debris remains in Indonesian waters and moves back and forth due to the influence of monsoon currents.
MARINE POLLUTION BULLETIN
(2024)