Article
Environmental Sciences
Chao Guo, Leicheng Guo, Sarah Bass, Andrew J. Manning, Zhongwu Jin, Yinjun Zhou
Summary: The effects of different types of organic matter on fine sediment flocculation were investigated through laboratory tank experiments. Results demonstrated that the introduction of organic polymers (such as xanthan gum and guar gum) significantly enhanced flocculation, while the addition of humic acid had minimal influence. The nonionic polymer guar gum showed greater efficacy in promoting larger and more fractal flocs compared to the anionic polymer, xanthan gum. Non-linear trends were observed in the evolution of floc size and structure with increasing ratios of organic polymer concentration to kaolinite concentration.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Biodiversity Conservation
Chen Gao, Min Xu, Wei Zhou
Summary: Tidal flats are under threat from climate change and human activities. This study introduces a physically-based model (MRTM) to estimate sediment moisture content (SMC) using remote sensing. The model demonstrates good performance in estimating SMC and outperforms traditional soil moisture indices in terms of accuracy.
ECOLOGICAL INDICATORS
(2023)
Article
Geosciences, Multidisciplinary
Jiangwen Li, Banglin Luo, Xihao Wei, En Ci, Jiupai Ni, Chaofu Wei, Shouqin Zhong
Summary: Water erosion selectively transports eroded sediments, leading to reduced soil fertility and increased risk of water pollution. Sloping farmland with gradients greater than 10° has been extensively studied, but there has been little focus on gentle slope lands. This study demonstrates the selective transportation characteristics of eroded sediments on gentle slope lands with gradients less than 6°.
Article
Geosciences, Multidisciplinary
Zhirui Deng, Qing He, Andrew J. Manning, Claire Chassagne
Summary: This study investigates the separate effects of salinity, EPS and living algae on sediment flocculation. The results show that increasing salinity slightly enhances sediment flocculation. In the presence of EPS, there is significant flocculation in saline water, but hardly any in demi-water. Living algae cells can flocculate with themselves and form large flocs, which can bind to sediment particles to form larger flocs in both demi-water and sea water.
Article
Marine & Freshwater Biology
Wenwu Zhu, Jiufa Li, Weihua Li
Summary: This paper investigates the dynamics and characteristics of sediment flocculation and finds that the morphology and size of flocs show significant variations with tidal changes. The size of flocs is highly related to tidal processes, and turbulent shear stress is the controlling factor for sediment flocculation.
JOURNAL OF SEA RESEARCH
(2022)
Article
Engineering, Environmental
Xiaoteng Shen, Mingze Lin, Yuliang Zhu, Ho Kyung Ha, Michael Fettweis, Tianfeng Hou, Erik A. Toorman, Jerome P. -Y. Maa, Jinfeng Zhang
Summary: The study demonstrates significant progress in using QMC schemes to solve PBM for simulating the flocculation of cohesive sediments, showing reasonable agreements with both analytical solutions and laboratory experiments. Different QMC schemes outperform the standard Monte Carlo scheme in accuracy and time consumption, with the QMC scheme using Halton sequence requiring the least particle numbers for reasonable accuracy. Sensitivity tests indicate that the fractal dimension and fragmentation distribution function have significant impacts on predicted FSDs.
Article
Geochemistry & Geophysics
Pingtian Ming, Dan Zou, Fei Li, Qingqing Xing, Zhen Wang
Summary: This study investigated the flotation of fine arsenopyrite particles using polyethyleneimine (PEI) as a flocculant. The results showed that PEI could improve the flotation of fine arsenopyrite by increasing particle size through flocculation.
Article
Engineering, Environmental
Que Nguyen Ho, Michael Fettweis, Jin Hur, Xavier Desmit, Jae In Kim, Dae Won Jung, Sang Deuk Lee, Sungyun Lee, Yun Young Choi, Byung Joon Lee
Summary: Interactions between microalgae and clay minerals can enhance biologically mediated flocculation, affecting the sedimentation and transportation of suspended particulate matter. Adequate amounts of biopolymers produced by microalgal cells enhance floc-to-floc attachment and flocculation kinetics, while excessive amounts of biopolymers and humic substances increase particle stabilization.
Article
Marine & Freshwater Biology
Shang-Shu Shih, Ting-Yu Cheng
Summary: The tidal channels and mudflats in estuarine wetlands are ecologically important for aquatic organisms and nutrient exchange. This study established a geomorphological model to understand their dynamics. The model was validated in the Tanshui River estuary, and findings revealed that soil properties and erosion rate were the most influential factors. The asymmetry between ebb and flood tides contributed to the maintenance of tidal channels. River floods transported sediment and accelerated wetland siltation. Reduced tidal range and suspended sediment input were effective measures to prevent channel deposition.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Engineering, Civil
Zhenghui Cui, Lei Huang, Hongwei Fang, Fabian A. Bombardelli, Dianchang Wang, Xinghua Wu
Summary: This study generates a series of mathematical sediments to characterize natural particles with different sizes and surface heterogeneities. The results show that approaching particles are easier to attach to after collision, especially with increasing particle size or similarity in size. Meanwhile, the electrostatic interactions increase significantly with surface heterogeneities, reducing the approachable reversible attachment and mitigating flocculation in aquatic systems.
JOURNAL OF HYDRAULIC RESEARCH
(2023)
Article
Environmental Sciences
C. Xu, B. Odum, Y. Chen, P. Yao
Summary: The impact of silt content on the flocculation processes and settling and floc properties of clay-silt mixtures was investigated. The results show that increasing silt content reduces floc strength and size, as well as the settling velocities. The study also found that the flux-settling velocities increase with increasing silt content. These findings provide insights into the role of silt in the flocculation process of clay-silt mixtures in natural water environments.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Zhenchang Zhu, Tjeerd J. Bouma, Qin Zhu, Yanpeng Cai, Zhifeng Yang
Summary: This study evaluated the response of cordgrass seed bank dynamics to changing physical disturbance at tidal flats, revealing that wave disturbance reduced the persistence of seeds on the surface, while amplified sediment disturbance lowered the persistence of both surface and buried seeds. This indicates that increasing storminess and associated sediment variability under climate change threatens seed bank persistence in tidal flats.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Weiming Xie, Jianwei Sun, Leicheng Guo, Fan Xu, Xianye Wang, Hongyu Ji, Yaoshen Fan, Zheng Bing Wang, Qing He
Summary: Coastal tidal flats are important ecosystems, but they are highly vulnerable to tidal dynamics, sea-level rise, and human activities. This study examined the hydrodynamics, sediment transport, and morphological changes on two tidal flats in the Yellow River Delta with different tidal regimes. The results showed that longer inundation periods under diurnal tides led to more sediment deposition, while semi-diurnal tides resulted in increased wave impact and tidal flat erosion due to lower water depths. These findings highlight the joint role of tidal regime and powerful waves in controlling sediment availability and tidal flat evolution. This has implications for managing erosion and restoring vegetation in the Yellow River Delta.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Qian Zhang, Zheng Gong, Changkuan Zhang, Jessica Lacy, Bruce Jaffe, Beibei Xu, Xindi Chen
Summary: The study found that flow and SSC surges occur during periods of very shallow water on tidal flats, with flood surges in the lower intertidal flat being erosive and leading to local resuspension, while weaker surges in the middle intertidal flat do not resuspend bed sediment. Surges on the lower intertidal flats contribute up to 25% of onshore-suspended sediment flux during flood tides, despite lasting only 10% of the flood duration.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Minglan Yu, Xiao Yu, S. Balachandar, Andrew J. Manning
Summary: This study investigates the flocculation dynamics of cohesive sediments in turbulent flows using an Eulerian-Lagrangian framework. It examines the dependence of the mathematical form of floc size distribution on sediment properties under different stickiness and stiffness conditions. The research reveals that at equilibrium, there is a dynamic balance between aggregation and breakup processes, leading to a statistically self-similar floc size distribution.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Ryan P. Mulligan, Peter C. Smith, Jing Tao, Paul S. Hill
ESTUARIES AND COASTS
(2019)
Article
Oceanography
Brent A. Law, Paul S. Hill, Timmothy G. Milligan, Vanessa Zions
Article
Geosciences, Multidisciplinary
Alysse Mathalon, Beverly Goodman-Tchernov, Paul Hill, Akos Kalman, Timor Katz
Article
Fisheries
B. A. Law, P. S. Hill
AQUACULTURE ENVIRONMENT INTERACTIONS
(2019)
Article
Geosciences, Multidisciplinary
Bernard P. Boudreau, Paul S. Hill
Article
Oceanography
Jing Tao, Paul S. Hill
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2019)
Article
Environmental Sciences
Peter Cranford, Lindsay Brager, Deanna Elvines, David Wong, Brent Law
MARINE POLLUTION BULLETIN
(2020)
Article
Geology
Akos Kalman, Timor Katz, Paul Hill, Beverly Goodman-Tchernov
Article
Fisheries
M. A. Carvajalino-Fernandez, N. B. Keeley, I Fer, B. A. Law, R. J. Bannister
AQUACULTURE ENVIRONMENT INTERACTIONS
(2020)
Article
Environmental Sciences
Juliana Tavora, Emmanuel Boss, David Doxaran, Paul Hill
Article
Multidisciplinary Sciences
Nianzhi Jiao, Jihua Liu, Bethanie Edwards, Zongqing Lv, Ruanhong Cai, Yongqin Liu, Xilin Xiao, Jianning Wang, Fanglue Jiao, Rui Wang, Xingyu Huang, Bixi Guo, Jia Sun, Rui Zhang, Yao Zhang, Kai Tang, Qiang Zheng, Farooq Azam, John Batt, Wei-Jun Cai, Chen He, Gerhard J. Herndl, Paul Hill, David Hutchins, Julie LaRoche, Marlon Lewis, Hugh MacIntyre, Luca Polimene, Carol Robinson, Quan Shi, Curtis A. Suttle, Helmuth Thomas, Douglas Wallace, Louis Legendre
Summary: The study found that chemical oxygen demand (COD) is not an appropriate proxy for assessing the microbial degradability of organic matter in aquatic environments, and recommends the replacement of COD with an optode-based biological oxygen demand method.
Article
Oceanography
B. A. Law, T. G. Milligan, P. S. Hill, G. L. Bugden
Summary: In the hyper-tidal Minas Basin, the concentration of total suspended matter increases dramatically in winter due to remobilization of material from tidal flats and cliff erosion by storms. The particle packaging and settling varies between winter and summer, with large, low-density flocs forming rapidly in winter but small, high-density aggregates dominating in summer. Flocculation rate increases in winter, but sediment remains mobile due to high stresses. The transition from winter to summer sees rapid floc formation and settling, with material accumulating on the flats in summer.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Engineering, Civil
Cody McLaughlin, Brent Law, Ryan Mulligan
Summary: The study examines the impacts of powerful storms and storm surge on coastal areas, particularly in the Gulf of Maine and Bay of Fundy system. Using a coupled hydrodynamic-wave model, the research investigates the effects of Hurricane Arthur in 2014 and the historically significant Saxby Gale of 1869. Results suggest that a well-timed tropical cyclone during a high spring tide has the potential to cause extensive flooding by overtopping existing dyke systems.
COASTAL ENGINEERING JOURNAL
(2022)
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)