Article
Geosciences, Multidisciplinary
Ryan Osborn, Kieran B. J. Dunne, Thomas Ashley, Jeffrey A. Nittrouer, Kyle Strom
Summary: This study uses in situ measurements of suspended mud to evaluate the flocculation state of the lowermost freshwater reaches of the Mississippi River. The results show that the mud is flocculated in both summer and winter, with slightly larger floc sizes in summer due to enhanced microbial activity. Floc size can explain vertical variations in mud concentration profiles when the bed is predominantly composed of sand.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Environmental Sciences
A. Marefat, A. Ghaderi, A. Karbassi
Summary: The research on the Shafa Rud estuary reveals that Cd, Cr, Co, and Ni concentrations flocculate at rates of 93.5%, 88%, 67%, and 61% respectively as the river mixes with the sea. Flocculated metals lose stability and return to soluble phase, resulting in decreased flocculation rates of Cd, Cr, Co, and Ni to 92.5%, 76%, 51%, and 32.5% respectively. Additionally, a sinusoidal voltage of 6 volts intensifies the flocculation rate of Cr and Co to achieve standard levels in aquatic environments. Understanding the natural behavior of metals and their flocculation processes could be applied for treating polluted metals.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Zhirui Deng, Qing He, Claire Chassagne, Zheng Bing Wang
Summary: The variation of floc population in the Changjiang Estuary has been studied for both winter and summer seasons, with the presence of living algae characterized through the chlorophyll-a concentration to suspended sediment concentration ratio. The floc population consists of three particle classes and remains at a steady state due to limited flocculation ability between classes. Macroflocs and microflocs coexist in the water column, with macroflocs found mainly at the top during winter and abundant in the presence of algae during summer.
Article
Biotechnology & Applied Microbiology
Yong Cheng, Longjun Xu, Chenglun Liu
Summary: In this study, red mud was used as a raw material to extract aluminum and iron, and a highly efficient polyaluminium ferric chloride (PAFC) flocculant was prepared. The flocculation performance of the PAFC under different synthesis and flocculation conditions was investigated. The results showed that the PAFC prepared at specific conditions had the optimum effect and could be used for the treatment of aged landfill leachate.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Engineering, Environmental
Jia-Yong Lao, Rongben Wu, Yongsheng Cui, Shiwen Zhou, Yuefei Ruan, Kenneth M. Y. Leung, Jiaxue Wu, Eddy Y. Zeng, Paul K. S. Lam
Summary: The study highlights the importance of atmospheric deposition and surface runoff as pathways for OPEs to enter and migrate in the Pearl River Estuary; the particle-mediated transport of OPEs is influenced by various factors, including physicochemical properties, environmental factors, and marine microbial activities; there is a need for increased attention to the input and environmental fate of OPEs in the estuary.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Oceanography
Hao Wu, Ya Ping Wang, Shu Gao, Fei Xing, Jieping Tang, Dezhi Chen
Summary: The fluid mud layer in the ETM of the Yangtze Estuary frequently varies in thickness during spring and intermediate tides, reaching up to 0.6m at times but remaining stable during neap tides. This layer transports more than double the sediment as the low-concentration upper layer.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Oceanography
Galen Egan, Grace Chang, Andrew J. Manning, Stephen Monismith, Oliver Fringer
Summary: This study conducted field work and collected data in a wave- and current-driven estuarine environment to examine cohesive sediment flocculation dynamics. The study found that the factors driving floc size variability differed between locally sourced sediment and suspended sediment advected from upstream. The analysis also revealed seasonal variability in these trends and presented evidence of a relationship between floc size and the inverse turbulent Schmidt number.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Qinqin Liu, Xiaojian Liu, Jian Chen, Peng Hou, Yong He, Qisong Wang, Xiaowei Zhu, Qiang Wang, Huan Gao
Summary: The study proposes an ultrasound-assisted flocculation-settling method to analyze the factors affecting cohesive sediment. The results show that ultrasound waves have the best effect on flocculation and sedimentation when the sediment concentration is around 40%-50%. The study also analyzes the moisture content of sediment under wet and dry conditions. These research findings can provide a theoretical basis and technical reference for siltation, evolution, and sediment flow treatment.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2023)
Article
Environmental Sciences
Weiwei Song, Yi Li
Summary: This study investigated the ecological state of typical tidal flats along the eastern coast of China using field sampling, numerical simulation, and high-throughput sequencing. The findings revealed that the microbial communities in different subregions of the area exhibited notable differences due to variations in water quality and pollutant discharge. The study identified the impact of river pollutants on wetland microbial communities and established ecological patterns between the river and the sea, offering suggestions for watershed management and protection of coastal tidal flats.
ENVIRONMENTAL RESEARCH
(2023)
Article
Construction & Building Technology
Cui Yun-liang, Pan Fang-ran, Zhang Bing-bing, Wang Xin-quan, Diao Hong-guo
Summary: An integrated method of flocculation, vacuum preloading, and solidification using curing agents was proposed to treat waste engineering mud, which showed significantly higher strength of solidified soil compared to traditional methods. Experiment results indicated the effectiveness of the proposed integrated treatment method with cement + retarder + quicklime as an ideal combination of curing agents.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Ecology
Antoine Gardel, Edward J. Anthony, Valdenira F. dos Santos, Nicolas Huybrechts, Sandric Lesourd, Aldo Sottolichio, Tanguy Maury, Morgane Jolivet
Summary: The Maroni River in South America is a tropical estuary with a high supply of sandy sediments and low suspension-sized sediment load. Sand supplied by the river is transported westwards by longshore transport, leading to the construction of sandy cheniers.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Himanshu Balhara, Bhaskar Botcha, Sarah J. Wolff, Satish T. S. Bukkapatnam
Summary: This paper presents an experimental study on the characterization of ripples and other morphological formations on the surfaces of DED-printed stainless steel (316L) components. The study establishes that ripple traces are a main determinant of the dendritic structures and the heterogeneous distribution of microstructure formations in DED-printed 316 components. Statistical characterization highlights the limitations of commonly employed ripple waveform descriptors and introduces spectral quantifiers to capture the complex waveform patterns of ripples in DED.
MATERIALS & DESIGN
(2023)
Article
Environmental Sciences
T. T. Huynh, J. Kim, W. Kim, J. Hur, Q. N. Ho, Q. Bi, T. V. Bui, J. J. Kim, S. D. Lee, Y. Y. Choi, B. J. Lee
Summary: This study investigated the dynamics of suspended particulate matter (SPM) and associated processes in a river under different weather conditions and hydraulic structures. The findings showed that the presence of biopolymers and flocculation potential in the water promoted SPM deposition and high-concentration sediment layer formation during the pre-flood period. However, the turbulent flow conditions during the post-flood period disrupted the deposition and resulted in a more homogeneous turbidity profile.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
T. C. Ashley, K. Strom
Summary: The study tests the applicability of a model based on the stress exerted by the fluid on the bed surface approaching the critical entrainment stress as a closure assumption in dynamically evolving river systems, and finds limitations in predicting transient channel processes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Justin A. Nghiem, Woodward W. Fischer, Gen K. Li, Michael P. Lamb
Summary: This study investigates the role of flocculation in mud transport in rivers. The authors developed and calibrated a semi-empirical model for floc diameter and settling velocity in rivers. The results show that turbulent shear limits floc size, and clay abundance and composition are important factors for flocculation. The study also found that floc settling velocity increases with greater mud and organic matter concentrations. The calibrated model explains river floc settling velocity data within a factor of about two.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Geology
Alina Shchepetkina, Murray K. Gingras, S. George Pemberton
JOURNAL OF SEDIMENTARY RESEARCH
(2015)
Article
Environmental Sciences
Alina Shchepetkina, Murray K. Gingras, John-Paul Zonneveld, S. George Pemberton
ESTUARIES AND COASTS
(2017)
Article
Geology
Alina Shchepetkina, Murray K. Gingras, S. George Pemberton
SEDIMENTARY GEOLOGY
(2016)
Article
Geology
Alina Shchepetkina, Murray K. Gingras, John-Paul Zonneveld, S. George Pemberton
SEDIMENTARY GEOLOGY
(2016)
Article
Geosciences, Multidisciplinary
A. Shchepetkina, M. K. Gingras, S. G. Pemberton
RUSSIAN GEOLOGY AND GEOPHYSICS
(2018)
Review
Geosciences, Multidisciplinary
Alina Shchepetkina, Murray K. Gingras, M. Gabriela Mangano, Luis A. Buatois
EARTH-SCIENCE REVIEWS
(2019)
Article
Geosciences, Multidisciplinary
Alina Shchepetkina, Juan Jose Ponce, Noelia Beatriz Carmona, M. Gabriela Mangano, Luis A. Buatois, Soledad Ribas, Marcela Celeste Villar Benvenuto
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Qi Chen, Alina Shchepetkina, Scott Melnyk, Murray K. Gingras
Summary: The Lower Cretaceous McMurray Formation contains crude bitumen reserves of the Athabasca Oilsands. This study discusses the formation mechanism of crude bitumen reserves, the use of dipmeter data to improve facies identification and recognition of point-bar geometry. Analyzing dipmeter tadpole patterns can help refine facies interpretations, particularly in studying point-bar stacking patterns.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Alina Shchepetkina, Michelle Speta, Murray K. Gingras, Benoit Rivard, S. George Pemberton
BULLETIN OF CANADIAN PETROLEUM GEOLOGY
(2017)
Article
Energy & Fuels
A. Shchepetkina, M. K. Gingras, S. G. Pemberton, J. A. MacEachern
BULLETIN OF CANADIAN PETROLEUM GEOLOGY
(2016)