Article
Marine & Freshwater Biology
Mohsen Taherkhani, Sean Vitousek, Ryan K. Walter, Jennifer O'Leary, Amid P. Khodadoust
Summary: Flushing time in Morro Bay, a short, low-inflow estuary, was investigated using a hydrodynamic model. Tidal variability was found to have the strongest control on flushing times. Increasing sea level and decreasing bed roughness were associated with higher mixing rates and lower flushing times. Areas with shorter flushing times were correlated with resilient eelgrass populations.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Hilda de Pablo, Joao Sobrinho, Daniel Garaboa-Paz, Caio Fonteles, Ramiro Neves, Miguel B. Gaspar
Summary: Understanding the retention time and flushing rate of water in an estuary is crucial for assessing the health of estuaries with high pollutant loadings. This study examines the impact of different river discharge scenarios on the residence time and exposure time of water in the Tagus estuary, identifying the areas most vulnerable to pollution.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Viyaktha Hithaishi Hewageegana, Maitane Olabarrieta, Jose M. Gonzalez-Ondina
Summary: In this study, the main processes affecting the residence time of the Caloosahatchee River Estuary were identified and analyzed. The residence time showed a strong seasonality driven by the river discharge, and was influenced by wind velocity and direction. Water density gradient-induced circulation and particle buoyancy also played a role in determining the residence time. The outcomes of this study have implications for understanding residence time in other estuaries and improving water quality management.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Aditi Mitra, V. Sanil Kumar
Summary: A 2D-numerical model is used to estimate suspended sediment transport and residence time of the Gulf of Khambhat, showing higher residence time and suspended sediment concentration in the northern region. The barrier formed during non-monsoonal months causes distinct differences in residence time and suspended sediment between the Gulf and Arabian Sea.
MARINE POLLUTION BULLETIN
(2021)
Article
Engineering, Chemical
H. Upender, K. Anand Kishore, Asif Afzal, Md Tariqul Islam, Muhammad Ibrahim
Summary: A laboratory setup of a tapered inverse fluidized bed was used to examine the mean residence time characteristics and the dispersion coefficient. The study found that the liquid tracer mean residence time and axial dispersion coefficient significantly depended on particle density, tapered angle of the column, and superficial liquid velocity. Empirical correlations were developed for the mean residence time of the tracer based on experimental data.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Environmental Sciences
Xin Yu, Jian Shen, Jiabi Du
Summary: This study presents an inverse method to estimate bacterial loading from a watershed by using field-measured bacterial concentrations and numerical model-calculated residence time. The approach takes into account seasonal and interannual variations in hydrodynamics, showing high consistency with known input loadings in numerical experiments. It can be used to cross-check watershed models and assess changes in watershed conditions with sparse observational data, demonstrating its reliability for water quality management.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Engineering, Chemical
Jia Yu, Xi Gao, Liqiang Lu, Yupeng Xu, Cheng Li, Tingwen Li, William A. Rogers
Summary: This study validated a filtered drag model for solid RTD prediction in a chemical reactor, showing good agreement between the model simulation and experimental data for flow hydrodynamics.
Article
Meteorology & Atmospheric Sciences
Wenxia Zhang, Julia M. Moriarty, Hui Wu, Yang Feng
Summary: The study found that the formation and maintenance of low oxygen offshore of the Changjiang River Estuary occur at high frequencies in certain regions known as bottom hypoxia hotspots, specifically the southern shallow bank and submarine canyon. The spatial extent of bottom hypoxia is significantly sensitive to riverine inputs, particularly changes in river discharge, which have a greater impact on hypoxia over the shallow bank than the submarine canyon. Increasing wind speed can reduce the spatial extent and total volume of bottom hypoxic water, while weakening Kuroshio intrusion can prolong the near-bottom water residence time and increase bottom hypoxia extent.
Article
Environmental Sciences
Kiranya Bella, Pramila Sahadevan, Rajeev Raghavan, Karan Kumar Ramteke, Giri Bhavan Sreekanth
Summary: A trophic model was constructed for the Poonthura Estuary, revealing that the ecosystem in this anthropogenically impacted estuary is impaired and differs in trophic functioning from estuaries with similar physical features. The study provides a pioneering step in understanding the ecosystem status and functioning of small, anthropogenically disturbed estuaries, and offers a theoretical and scientific basis for their management and restoration.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Smita Mitbavkar, Aseem R. Rath, Arga Chandrashekar Anil
Summary: The dynamics of picophytoplankton in river-dominated estuaries, especially those affected by human modifications, are least explored. This study in the Hooghly River estuary and an adjacent semi-enclosed dock found that the community structure and abundance of picophytoplankton are controlled by environmental and hydrographic factors, with the dock showing higher abundance due to longer water residence time and better resource utilization capabilities. These findings support the hypothesis of a synergistic role of environmental parameters and hydrodynamics in regulating picophytoplankton communities.
Article
Ecology
Danial Goodarzi, Abdolmajid Mohammadian, Jonathan Pearson, Soroush Abolfathi
Summary: This paper investigates the hydraulic performance and solute transport processes in waste stabilization ponds (WSPs) and develops a numerical model for analysis. The results indicate that island retrofitting has a positive impact on the hydraulic performance of WSPs, but the slope ratio plays a key role in determining the overall performance.
ECOLOGICAL ENGINEERING
(2022)
Article
Engineering, Ocean
Lucas Mackie, Paul S. Evans, Magnus J. Harrold, Tim O'Doherty, Matthew D. Piggott, Athanasios Angeloudis
Summary: Representation of the marine environment is crucial for reliable coastal hydrodynamic models, with this study exploring the implications of common depth-averaged model configuration choices on accurately characterizing seabed geometry and roughness. Using Ramsey Sound in the UK as a case study, it was found that notable bathymetric features such as Horse Rock and The Bitches significantly influence local and regional hydrodynamic characteristics. The study also highlights the importance of adjusting seabed roughness parameterisations and computational mesh refinement for accurately modelling energetic hydrodynamics in such environments.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Environmental
Siyuan Chen, Yi Ouyang, Laurien A. Vandewalle, Geraldine J. Heynderickx, Kevin M. Van Geem
Summary: In this study, a computational fluid dynamics (CFD) Euler-Euler model is developed to investigate the hydrodynamics and residence time distribution in a gas-liquid vortex unit (GLVU). The results show that the liquid layer rotation in the vortex chamber suppresses the gas phase vortex flow. Near the gas injection slots, the flow behavior is similar to a continuous stirred tank reactor (CSTR), leading to improved mixing and mass transfer efficiency.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Hong-Wei Liang, Wen-Ling Li, Zi-Sheng Feng, Han Chen, Hong-Wang Qiao, Lei Shao, Guang-Wen Chu, Yang Xiang
Summary: This study established a three-dimensional computational fluid dynamics model to simulate the gas-liquid flow and mass transfer characteristics in a bubble column. The predicted values of the modified eddy cell mass transfer model were found to be more consistent with experimental results. The study showed significant changes in gas holdup, bubble diameter, and gas-liquid interface area with and without mass transfer. Furthermore, the gas flow rate and static liquid height were found to have varying effects on the gas-liquid flow field and mass transfer characteristics.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Ocean
Xu Xiang
Summary: Extensive hydrodynamic and hydro-elastic tests have been conducted for a long floating bridge project, providing validation for numerical analysis, studying hydrodynamics phenomena, and verifying the design under controlled environmental loads. The tests also explored the interaction between wave-current-structure and pontoon hydrodynamics. Correlation between test results and numerical analysis was an important part of the study. The tests have validated analysis methods, enhanced the bridge concept's structural reliability, and informed the next phase of design.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Industrial
Xiancun Hu, Xianhu Hu, Qinghong Cui, Yan Li, Charles Lemckert, Aifang Wei
Summary: A developed spatial-temporal analysis framework was proposed to investigate the business performance of construction consultancy services in China, finding that scale efficiency significantly enhances business performance while pure technical efficiency plays a less conspicuous role. Engineering survey and design outperformed in terms of performance and imbalances, recommended for entering the service market in China.
ENGINEERING CONSTRUCTION AND ARCHITECTURAL MANAGEMENT
(2022)
Article
Oceanography
Yun Yang, Weibing Guan, Eric Deleersnijder, Zhiguo He
Summary: This study investigates the hydrodynamics and sediment dynamics of the Pearl River Estuary during Typhoon Mangkhut in 2018. The results suggest that wave-current interaction and strong wind-induced currents are key factors for erosion, significantly influencing the suspended sediment concentration in the water.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Environmental Sciences
Joana Figueiredo, Christopher J. Thomas, Eric Deleersnijder, Jonathan Lambrechts, Andrew H. Baird, Sean R. Connolly, Emmanuel Hanert
Summary: The study demonstrates that a 2-degree Celsius warming will reduce the dispersal distance of coral larvae and connectivity between reefs, impacting coral reef recovery and the spread of warm-adapted genes.
NATURE CLIMATE CHANGE
(2022)
Article
Meteorology & Atmospheric Sciences
Daan Reijnders, Eric Deleersnijder, Erik Sebille
Summary: Coarse-resolution Eulerian ocean models use tracer diffusion parameterizations to capture the effects of mesoscale turbulent eddies. Parameterizations are also needed for eddy dispersion in Lagrangian simulations. This study compares random walk dispersion and the Markov-1 model, finding that Markov-1 produces Lagrangian trajectories that better resemble trajectories from eddy-resolving simulations.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Engineering, Chemical
Abolfazl Ansari, Fariba Malekpour Galogahi, David Thiel, Fernanda Helfer, Graeme Millar, Sofiane Soukane, Noreddine Ghaffour
Summary: This study introduces a new model for AGMD that considers both heat and mass transfer, and uses a precise logarithmic function of vapour pressure to model the water permeate flux. Evaluating the system under different operating conditions, it was found that increasing the Reynolds number improves the overall performance.
Article
Engineering, Environmental
Mohammad Hassan Ranjbar, David P. Hamilton, Amir Etemad-Shahidi, Fernanda Helfer
Summary: This study investigates the impact of atmospheric stilling on the distribution of Microcystis blooms. The results highlight the importance of considering dynamic variations in colony size for accurate prediction of cyanobacterial bloom development and decay. The findings suggest that atmospheric stilling needs to be included in projections of changes in the frequency, distribution and magnitude of blooms of buoyant, colony-forming cyanobacteria under climate change.
Article
Engineering, Chemical
P. Pazouki, E. S. Teshnizi, E. Bertone, F. Helfer, R. A. Stewart
Summary: This study compares three possible desalination alternatives using a multi-criteria decision-making method. The results show that the UF-RO hybrid system is the best performing alternative, consistently maintaining high efficiency levels across various criteria. The FO-RO hybrid system and the RO standalone system perform similarly.
Article
Engineering, Chemical
Abolfazl Ansari, Fariba Malekpour Galogahi, Graeme Millar, Fernanda Helfer, David V. Thiel, Sofiane Soukane, Noreddine Ghaffour
Summary: Air-gap membrane distillation (AGMD) is a novel method that can reduce heat requirements for water purification. However, AGMD faces challenges such as low water permeate flux and downstream performance reduction. A 2D comprehensive study using computational fluid dynamics (CFD) simulation was conducted to examine the effectiveness of solar absorbers and spacer filaments in addressing these challenges. The results demonstrated that solar absorbers slightly increased water flux and decreased temperature and concentration polarisation effects, while cylindrical detached spacers improved water flux compared to other types of spacers. The proposed spacer-filled module significantly enhanced AGMD performance and resulted in uniform water flux throughout the module.
Article
Engineering, Chemical
Abolfazl Ansari, Fariba Malekpour Galogahi, Graeme Millar, Fernanda Helfer, David V. Thiel, Sofiane Soukane, Noreddine Ghaffour
Summary: This study examined the impact of solar absorbers and different spacer filaments on the performance of direct contact membrane distillation (DCMD). A computational fluid dynamics model was developed to simulate water flux in DCMD modules with different designs of solar absorbers and spacer filaments. The results showed that a module equipped with a solar absorber membrane enhanced the DCMD performance better than a module with a solar absorber plate. Moreover, a module with cylindrical detached spacer filaments improved DCMD performance more than a module with rectangular and semicircular attached spacers. Finally, a module equipped with an integrated developed spacer and solar absorber membrane significantly enhanced water flux and both concentration and temperature polarisations, particularly when the inlet velocity was increased.
Article
Environmental Sciences
Mohammad Reza Ramezani, Fernanda Helfer, Bofu Yu
Summary: This study assessed the impacts of climate change and land-use change on runoff in six catchments in Southeast Queensland, Australia. A novel framework incorporating satellite images and a hydrological model was used to simulate baseline runoff and predict future runoff. The results showed that climate change would decrease runoff, while urbanization would increase runoff. Decision makers can use these findings to develop water management plans at the catchment scale.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Iresha Erangani Piyarathna, Yee Yan Lim, Mahesh Edla, Ahmed Mostafa Thabet, Mustafa Ucgul, Charles Lemckert
Summary: In recent years, there has been considerable interest in harvesting energy from ultralow-frequency vibrations for wearable devices and wireless sensors. Conventional linear piezoelectric energy harvesters are often inefficient for practical applications due to their narrow operating bandwidth. This study proposes a novel multimode design, the bent branched beam harvester (BBBH), which enhances the output voltage and power for ultralow-frequency applications. Experimental results show that the BBBH outperforms conventional designs, achieving higher output voltages and power with a wider operating bandwidth.
Article
Chemistry, Analytical
Iresha Erangani Piyarathna, Ahmed Mostafa Thabet, Mustafa Ucgul, Charles Lemckert, Yee Yan Lim, Zi Sheng Tang
Summary: This study proposed a novel multimode harvester design named the arc-shaped branch beam harvester (ASBBH), which achieved a broader operating bandwidth and significantly higher effectiveness, in comparison with conventional cantilever beam harvesters (CBH).
Article
Computer Science, Artificial Intelligence
Rafael Oliveira, Richard Scalzo, Robert Kohn, Sally Cripps, Kyle Hardman, John Close, Nasrin Taghavi, Charles Lemckert
Summary: Bayesian optimization (BO), using Gaussian process (GP) surrogate models, has been a successful approach to optimize expensive functions. However, GPs lack interpretability and informative power in modeling complex physical phenomena in scientific applications. This article investigates an alternative BO framework using sequential Monte Carlo (SMC) for Bayesian inference with parametric models, and presents experimental results showing its performance improvements over GP-based BO approaches in engineering applications.
DATA-CENTRIC ENGINEERING
(2022)
Review
Education & Educational Research
Fouzeh Albeshree, Malik Al-Manasia, Charles Lemckert, Shuangzhe Liu, Dat Tran
Summary: This paper explores the challenges and methods for improving the mathematical skills of undergraduate Engineering and Information Technology students. The study found a need for further development of innovative teaching strategies and recommends an interdisciplinary approach to enhance understanding and performance.
INTERNATIONAL JOURNAL OF MATHEMATICAL EDUCATION IN SCIENCE AND TECHNOLOGY
(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)
