Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Yigang Wang
Summary: The study investigates the erosion threshold of sand-mud mixtures by analyzing the momentum balance of particles in the bed surface, and develops a formula for the critical shear stress that also applies to pure sand and mud. The variation in critical shear stress over mud content is attributed to the varying dry bulk density of the mud component in the mixture. The developed formula accurately predicts the critical shear stress of sand-mud mixtures and pure mud during consolidation, offering a convenient application by relating critical shear stress to mud content and dry bulk density.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Dake Chen, Jinhai Zheng, Chi Zhang, Dawei Guan, Yuan Li, Huiming Huang
Summary: This study investigates the incipient motion condition of cohesive sediment considering particle aggregation using fractal theory and van der Waals force. A formula for the critical shear stress for surface erosion of cohesive sediments composed of fractal aggregates is developed, and the contribution rate of aggregate weight to erosion threshold is quantified.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Maria Esther Leyva Ollivier, Alice Newton, Heath Kelsey
Summary: This study presents a social-ecological analysis of eutrophication in the Chesapeake Bay, USA, using the DPSIR framework. It identifies the drivers, pressures, state, impacts, and responses of the issue, as well as the stakeholders involved. The study also highlights the main management measures, such as the Chesapeake Bay Program and accountability tools like the Chesapeake Bay Foundation and Report Cards.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Peng Yao, Min Su, Zhengbing Wang, Leo C. van Rijn, Marcel J. F. Stive, Chunyang Xu, Yongping Chen
Summary: The erosion threshold of silt-sized sediment is studied to understand the transitional erosion behavior of silt-dominated mixtures. A critical silt content is identified, separating the mixed bed into sand-dominated and silt-dominated domains. The stability of a silt skeleton formed by attraction forces is found to play a crucial role in the erosion behavior.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Robert J. Latour, James Gartland, Christopher F. Bonzek
Summary: Fisheries-independent surveys are important for fisheries management and ecosystem science, but the need to maintain historic sampling protocols limits the use of new technologies for data collection.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Civil
M. Stone, B. G. Krishnappan, S. Granger, H. R. Upadhayay, Y. Zhang, C. A. Chivers, Q. Decent, A. L. Collins
Summary: The study focused on the transport characteristics of fine sediment in the upper River Taw in southwest England, providing parameters necessary for modeling fine sediment transport. The experimental data were used to calibrate and test a mathematical model (FLUME model) for cohesive sediments, which showed good agreement between measured and modeled data. The study emphasized the importance of understanding transport parameters for assessing sediment control options and pollution abatement strategies at a catchment scale.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Marine
Timothy T. Wynne, Michelle C. Tomlinson, Travis O. Briggs, Sachidananda Mishra, Andrew Meredith, Ronald L. Vogel, Richard P. Stumpf
Summary: This manuscript describes methods for evaluating the efficacy of five satellite-based Chlorophyll-a algorithms in Chesapeake Bay. The results show that a two-band algorithm based on the red-edge portion of the electromagnetic spectrum exhibited the lowest overall error when applied to OLCI imagery.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Hamed Behzadipour, Abouzar Sadrekarimi
Summary: Microbially induced calcite precipitation (MICP) driven by native microorganisms in soil was explored in this study, comparing the roles of yeast extract, molasses, and biochar in stimulating these microorganisms with bioaugmentation. Results showed that biochar-assisted microbial treatment led to increased strength and reduced permeability in sand specimens, with potential applications in stabilizing slopes against wave-induced erosion.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Construction & Building Technology
Kangle Zuo, Xiaoqiang Gu, Chao Hu, Jing Hu, Guangyun Gao
Summary: In this study, the effects of fines content (FC) and sand gradation on small strain shear modulus G0 in sand-fines mixtures were investigated. The results showed that G0 continuously decreased as FC increased, reaching nearly 50% of clean sand at the highest FC. The stress dependence of G0 was found to be insensitive to FC. A new predictive model was proposed to evaluate G0, taking into account the effects of void ratio, confining pressure, FC, and sand gradation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Hun Jun Ha, Ho Kyung Ha
Summary: Erosion of cohesive sediments in estuarine and intertidal environments remains a widely studied phenomenon. This study compared three methods for determining the surface erosion threshold, finding that the suspended sediment concentration method yielded lower values compared to the erosion rate and eroded mass methods. The research also identified spatiotemporal variations of erosion threshold values in intertidal flats using the eroded mass method.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Engineering, Geological
Mengtao Wu, Fangcheng Liu, Jun Yang
Summary: This paper focuses on the stress-strain-strength behavior of geogrid-reinforced rubber-sand mixture (RSM) and analyzes the effects of reinforcement layers, rubber contents, and confining pressures. The test results show that the strength parameters of the geogrid-reinforced RSM are significantly improved, with increasing reinforcement layers and decreasing confining pressure. The RSM with a 20% rubber content may be the optimum choice for reinforcement with geosynthetics. Additionally, a new equation is proposed to estimate the strength reinforcement effect of composite mixtures.
Article
Environmental Sciences
Tyler Wagner, Paul McLaughlin, Kelly Smalling, Sara Breitmeyer, Stephanie Gordon, Gregory B. Noe
Summary: The study found that long-term monitoring at multiple sites is required to fully understand regional trends in chemical contaminant concentrations in rivers, while short-term monitoring periods are insufficient to detect these changes. Additionally, total estrogenicity may be a useful indicator.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Geological
D. R. Manohar, P. Anbazhagan
Summary: The shear strength characteristics of geosynthetic-reinforced rubber-sand mixture (RSM) were investigated by analyzing the size effect of rubber, different rubber content proportions, types and layers of geosynthetics, and their arrangement. The reinforced RSM showed enhanced strength and energy absorption capacity, as well as decreased brittleness index values.
GEOTEXTILES AND GEOMEMBRANES
(2021)
Article
Marine & Freshwater Biology
Guandong Li, Kehui Xu, Z. George Xue, Haoran Liu, Samuel J. Bentley
Summary: Barataria Bay serves as a receiving basin for a large sediment diversion project in Louisiana, USA, with data showing that salinity variations are controlled by wind and tidal currents in the region. Sediment resuspension is primarily triggered by wave-current shear stress, with net sediment transport occurring during cold front passages. Sediment transport direction and magnitude change significantly with shifting wind patterns, impacting wetland sedimentation and potential sediment escape from the bay. The timing of diversion operations, wind directions, and water levels should all be considered for effective future management of coastal areas.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Engineering, Geological
Mengtao Wu, Wenhui Tian, Fangcheng Liu, Jun Yang
Summary: This technical note investigates the shear modulus and damping ratio of geocell-reinforced rubber sand mixtures (RSM). The results show that geocell reinforcement can increase the vertical confinement of the system, weaken the anti-S-shaped characteristics of hysteresis loops, and enhance the damping ratio of RSM at large strain amplitudes. The normalized shear modulus degradation curves demonstrate the influence range of geocell reinforcement, suggesting that a rubber content of 20% may be an optimal value for reinforced specimens.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Oceanography
Kevin B. Briggs, Grace Cartwright, Carl T. Friedrichs, S. Shivarudruppa
CONTINENTAL SHELF RESEARCH
(2015)
Article
Limnology
S. Jarrell Smith, Carl T. Friedrichs
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2015)
Article
Environmental Sciences
Allison M. Colden, Kelsey A. Fall, Grace M. Cartwright, Carl T. Friedrichs
ESTUARIES AND COASTS
(2016)
Article
Engineering, Marine
Sarah E. Renni, Alan Brandt, Carl T. Friedrichs
Article
Environmental Sciences
Zeng Zhou, Luying Chen, Ian Townend, Giovanni Coco, Carl Friedrichs, Changkuan Zhang
JOURNAL OF COASTAL RESEARCH
(2018)
Article
Oceanography
Aaron J. Bever, Marjorie A. M. Friedrichs, Carl T. Friedrichs, Malcolm E. Scully
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Article
Geosciences, Multidisciplinary
Maitane Olabarrieta, W. Rockwell Geyer, Giovanni Coco, Carl T. Friedrichs, Zhendong Cao
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2018)
Article
Geosciences, Multidisciplinary
Cagdas Bilici, Nina Stark, Carl T. Friedrichs, Grace M. Massey
GEO-MARINE LETTERS
(2019)
Article
Multidisciplinary Sciences
Jessica S. Turner, M. Lisa Kellogg, Grace M. Massey, Carl T. Friedrichs
Article
Engineering, Marine
Danielle R. N. Tarpley, Courtney K. Harris, Carl T. Friedrichs, Christopher R. Sherwood
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2019)
Article
Oceanography
D. G. Bowers, E. M. Roberts, A. M. Hoguane, K. A. Fall, G. M. Massey, C. T. Friedrichs
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)
Article
Engineering, Civil
David W. Perkey, S. Jarrell Smith, Kelsey A. Fall, Grace M. Massey, Carl T. Friedrichs, Emmalynn M. Hicks
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING
(2020)
Article
Oceanography
Kelsey A. Fall, Carl T. Friedrichs, Grace M. Massey, David G. Bowers, S. Jarrell Smith
Summary: This study investigated the properties of flocs of varying organic content in the York River estuary using a combination of advanced optical instrumentation, water sampling, and in situ methods. The study found that organic matter plays a significant role in determining the characteristics of flocs suspended near the surface, and simple mathematical relationships could be applied to describe these properties.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Jessica S. Turner, Carl T. Friedrichs, Marjorie A. M. Friedrichs
Summary: While ecosystem health is improving in many estuaries worldwide following nutrient reductions, inconsistent trends in water clarity often remain. The study in Chesapeake Bay found that some measurements of downstream estuarine water clarity appear to be uncorrelated with watershed management actions, indicating the need for multiple metrics to address the issue. Satellite remote sensing provides an additional tool to assess long-term change in water clarity.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Ecology
Isaac D. Irby, Marjorie A. M. Friedrichs, Carl T. Friedrichs, Aaron J. Bever, Raleigh R. Hood, Lyon W. J. Lanerolle, Ming Li, Lewis Linker, Malcolm E. Scully, Kevin Sellner, Jian Shen, Jeremy Testa, Hao Wang, Ping Wang, Meng Xia
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)
