Article
Environmental Sciences
Elisa Helena Fernandes, Pablo Dias da Silva, Glauber Acunha Goncalves, Osmar Olinto Moller Jr
Summary: This study evaluated the transport trends of dredged material in different ocean disposal sites using numerical model techniques, finding that the best disposal site was at the actual Port of Rio Grande. This helps minimize potential environmental impacts and maximize efficiency of the dredging operation.
Article
Engineering, Environmental
Xiaoliang Ji, Yuan Ma, Ganning Zeng, Xiaoqun Xu, Kun Mei, Zhenfeng Wang, Zheng Chen, Randy Dahlgren, Minghua Zhang, Xu Shang
Summary: This study found that dredged sediments contain high concentrations of microplastics, which may potentially remobilize into the environment during the handling process. The dredged sediments stored in farmlands can disperse microplastics to surrounding soils and surface waters, with higher concentrations observed in dry and wet seasons due to wind dispersion and rainfall/runoff erosion, respectively.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Computer Science, Software Engineering
Jannek Gundlach, Maximilian Behnke, Christian Jordan
Summary: The software, PROVER-M, uses a simple near-field model to predict the active distribution of fine sediments after the disposal of dredged material. It aims to provide valuable input for far-field models, improving the accuracy of simulating the disposal of fine sediments on a larger scale. PROVER-M calculates the dynamic plume behavior, including the convective descent of sediments and their dynamic collapse on the bottom, resulting in a spatial distribution of disposed sediments through the water column and on the ground.
Article
Engineering, Civil
Le Ngoc Anh, Dung Duc Tran, Nguyen Thong, Can Thu Van, Dang Hoa Vin, Nguyen Hai Au, Edward Park
Summary: Recent riverbed sand mining activities have significantly altered estuarine morphology and sedimentation patterns in Southeast Asian deltas. The Soai Rap Estuary in Southern Vietnam is one of the most intensively mined areas in the region. This study used hydrodynamic modeling to investigate the effects of intensive riverbed mining on the estuarine morphology and sediment dynamics. The results showed that dredging activities substantially changed the hydraulic regimes, morphological patterns, and sediment dynamics of the estuary.
JOURNAL OF HYDROLOGY
(2022)
Article
Geosciences, Multidisciplinary
W. Ali, D. Enthoven, A. Kirichek, C. Chassagne, R. Helmons
Summary: Flocculation plays an important role in the dynamics of turbidity currents in the marine environment. Laboratory experiments show that flocculation occurs during the short time of the experiment when organic matter is present, leading to a reduced current propagation and significant changes in floc sizes and settling velocities.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Zhixin Qi, Ruiyang Sun, Yue Yu, Deqi Xiong, Wenxin Li, Xinping Yu, Sinan Fu
Summary: The study focused on the importance of oil-sediment aggregation and the individual performance of dispersed oil and sediment during the aggregation process. Results showed that sediment takes longer to reach equilibrium, especially under high mixing energy and large sediment concentrations, leading to the formation of high-density oil-sediment aggregates.
MARINE POLLUTION BULLETIN
(2021)
Article
Engineering, Marine
Dinh Tam Nguyen, Boo Cheong Khoo, Khoa Le-Cao, Erwan Bertevas, Nhan Phan-Thien
Summary: Experimental study shows that a high mass fraction bentonite suspension displays yield-stress behavior, forming a gel-like structure; in contrast, sand exerts a much greater force on the plate compared to bentonite sediment. Gel-like structure clay suspension exerts a greater force than fluidified suspension, with sand particles settling quickly while clay particles take longer.
Article
Environmental Sciences
Liqin Zhu, Haikuo Zhang, Yiping Li, Wei Sun, Congqing Song, Ling Wang, Guanchao Du, Shijiao Qiao, Jiaxin Sun, Linda A. Nuamah
Summary: Research on sediment dredging in free water surface constructed wetland (FWS) is important, but currently insufficient. This study compared the effects of different dredging depths and methods on water quality improvement, and found the appropriate dredging depth and method.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
J. R. Cox, Y. Huismans, S. M. Knaake, J. R. F. W. Leuven, N. E. Vellinga, M. van der Vegt, A. J. F. Hoitink, M. G. Kleinhans
Summary: Deltas and estuaries worldwide are facing the challenge of capturing sufficient sediment to keep up with relative sea-level rise. Anthropogenic interventions in the urbanized Rhine-Meuse Delta of the Netherlands have led to a negative sediment budget since the 1980s. The increase in dredging activities in ports and harbors, as well as changes in sediment composition, have important implications for navigation, ecology, flood safety, and management of sediment in the system.
Article
Ecology
S. Abdul Azeez, K. R. Muraleedharan, C. Revichandran, Sebin John, G. Seena, Ravikumar C. Nair, K. S. Arya, K. Sudheesh, M. P. Prabhakaran
Summary: This study investigated the sediment spill plume movement during dredging/dumping operations at the Old Mangalore port and recommended conducting dredging operations during the ebb tide to protect the mangrove ecosystem.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Article
Chemistry, Physical
Zhihua Sun, Jin Xiong, Shubo Cao, Jianxiong Zhu, Xuzhi Jia, Zhigang Hu, Kaiping Liu
Summary: The fracture toughness of sand concrete is affected by aggregate characteristics. Selecting appropriate fine aggregate can improve the toughness of sand concrete. Fineness modulus, angularity, and gradation of fine aggregates have significant impacts on the fracture toughness of sand concrete.
Article
Geosciences, Multidisciplinary
Chaoqian Zhang, Yongle Hu, Suwei Wu, Mingming Tang, Kexin Zhang, Heping Chen, Xuepeng Wan, Wensong Huang, Di Han, Zheng Meng
Summary: Due to the dual effects of fluvial and tides, tidal sand bars in estuaries have complex sedimentary characteristics and structures. This study used a sedimentary dynamics numerical simulation method to establish a tidal-controlled estuary model and analyzed the effects of tidal range and sediment grain size on tidal sand bars. The results showed that tidal range had a more significant effect on tidal sand bars compared to sediment grain size, affecting their length-to-width ratio and degree of development. The formation and distribution of shale layers in tidal-controlled estuaries were also influenced by tides.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Construction & Building Technology
Asim Rifa, Sk M. Subhani, A. Bahurudeen, Kumar Gedela Santhosh
Summary: This study comprehensively compares the performance of recycled fine aggregate concrete with other alternative fine aggregates. The results show that recycled concrete fine aggregate can meet the requirements within a certain range.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Environmental
Yubin Cao, Yanru Wang, Zuhua Zhang, Hao Wang
Summary: This paper demonstrates the feasibility and performance of using recycled sandstone waste in mortar manufacturing. The recycled sandstone sand shows better particle distribution and microscopic morphology compared to river sand, leading to improved mechanical properties and alkali silica reaction performance in mortar. Although the workability of the recycled sand is slightly lower, it can be improved by adjusting the water to binder ratio or adding water reducer. However, potential uncertain risks exist in terms of alkali silica reaction, which can be mitigated by using calcined clay or fly ash.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Engineering, Geological
Linzhu Li, Magued Iskander
Summary: Identifying the type of sand is essential for geotechnical exploration projects as it helps estimate the properties of the soil. This study explores the use of deep learning methods, specifically convolutional neural networks (CNN), to automatically classify sand types from individual images. Results show that computer vision has a remarkable ability to classify sand particles accurately, achieving a classification accuracy of 64% for individual particles and 100% for sand clusters.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2023)
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)