Development Of A Numerical Modeling Approach For Large Scale Fluid Mud Flow In Estuarine Environments
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Development Of A Numerical Modeling Approach For Large Scale Fluid Mud Flow In Estuarine Environments
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Author : Dennis Oberrecht
language : en
Publisher:
Release Date : 2021
Development Of A Numerical Modeling Approach For Large Scale Fluid Mud Flow In Estuarine Environments written by Dennis Oberrecht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Modeling categories.
Advances In Slurry Technology
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Author : Trevor Frank Jones
language : en
Publisher: BoD – Books on Demand
Release Date : 2023-11-02
Advances In Slurry Technology written by Trevor Frank Jones and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-02 with Science categories.
Written by experts from around the world, this book presents a comprehensive overview of slurry technology. The editor is grounded in the science of dilute concentrations of coarse particles in horizontal ducts, including settling distributions, critical deposition, swirling flow, and the two-layer model. This volume includes ten chapters that address such topics as process modelling, measurement (including non-Newtonian rheology), high-concentration conveying, vertical transport of fine-particle slurries, rheometry of sludges, pipe wear, and wastewater applications. There is also a chapter on an application at the fringe of our subject: fluidisation.
Multiscale Numerical Simulations Of A Complex Macrotidal Tidal River Estuary
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Author : Bing Wang
language : en
Publisher:
Release Date : 2011
Multiscale Numerical Simulations Of A Complex Macrotidal Tidal River Estuary written by Bing Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Modern field-scale numerical models of estuaries have become widely used to study estuarine dynamics and to assess the impacts of engineering projects on estuaries. While current estuarine models focus primarily on the large-scale tidal dynamics, the model developed in the present study applies higher resolution than pre-existing models to capture the multiscale physics in a realistic estuary (the Snohomish River estuary). The scales range from tidally-driven variability in free surface, velocity and salinity in the estuary to the local-scale interaction of the tidal flow with an abrupt sill that has a dimension of roughly 10 m by 100 m. The model is developed using the SUNTANS solver and employs the Eulerian-Lagrangian Method (ELM) for advection of momentum for improved stability in the presence of substantial wetting and drying. The unstructured mesh extends more than 20 km to cover the advection of the salinity front, while the finest resolution applied around the sill is on the order of meters. Model predictions of free surface, currents and salinity are in good agreement with field measurements. Sensitivity analysis shows that the bathymetry of the intertidal mudflats across the bypass is critical for accurate prediction of the circulation around the sill, while bottom drag, advection of momentum, and fresh river inflow has a smaller and limited effect on the tidal flows. The performance of several two-equation turbulence closure models (k-kl, k-epsilon and k-omega) and stability functions (KC and CA) in predicting mixing and stratification is evaluated via the generic length scale (GLS) approach, and it shows small differences between the closure models. The model robustly obtains reasonable temporal and spatial mixing patterns in the estuary at different stages of a tidal cycle. A quadratic interpolation method is implemented for ELM following the framework in Walters et al. (2007), and both an idealized backward-facing step test case and field-scale simulations show improved accuracy and reduced diffusion and dissipation with the quadratic interpolation. When the quadratic interpolation is implemented with a fine mesh that incorporates 1 m resolution around the sill, the model captures the recirculating eddies downstream of the sill observed during ebb tides, and the velocity structures along a cross-channel transect close to the sill compare favorably to measurements. Finally, the highly variable local salinity field resulting from the interaction of the sill with the advection of the salinity front is discussed based on model results.
A Fluid Mud Transport Model In Multi Dimensions
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Author :
language : en
Publisher:
Release Date : 2007
A Fluid Mud Transport Model In Multi Dimensions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
The long term goal is to develop a robust multi-phase, multi-class numerical modeling framework for both cohesive and non-cohesive sediment transport in the fluvial and coastal environments. The objectives of the present study focus on extending a fluid mud model for boundary-layer-driven and gravity-driven transport (Hsu et al. 2007) with several new capabilities. Specifically, the objectives are to: (1) Conduct comprehensive model-data comparisons with laboratory/field observed fluid mud processes, specifically in conjunction with new MURI initiative for understanding wave-mud interaction. (2) In conjunction to NOPP-Community Sediment Transport Model initiative, the fluid model is utilized to provide parameterizations for wave-boundary-layer-scale transport processes. (3) Extend the existing fluid mud model with a bed module to enable direct modeling on consolidation/fluidization. Extend the model to multi-dimensional for various coastal and estuarine applications.
Multiscale Physical Processes Of Fine Sediment In An Estuary
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Author : Yuanyang Wan
language : en
Publisher: CRC Press
Release Date : 2015-07-20
Multiscale Physical Processes Of Fine Sediment In An Estuary written by Yuanyang Wan and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-20 with Science categories.
Estuaries are natural highly dynamic and rapidly changing systems, comprising a complex combination of physical processes on many different time- and space- scales. The research conducted a systematic study on the topic of fine sediment physical processes in a meso-tidal convergent alluvial estuary. By means of multi-approaches (field survey, laboratory experiment and numerical modeling) and from multi-angles (data-driven analysis and process-based modeling) we highlight that multiscale (including micro- and macro- scale) physical processes jointly characterize the current and sediment regime in a fine sediment estuarine system. The study presented in this book investigates micro- and macro- scale physical processes of a large-scale fine sediment estuarine system with a moderate tidal range as well as a highly seasonal-varying freshwater inflow. Based on a series of measured, experimented and modelled data, the research highlights that (i) along-channel fresh-salt gradient near an estuarine turbidity maximum zone is a key parameter controlling local density stratification and sedimentation in the channel; (ii) the salinity-induced baroclinic pressure gradient forces are a major factor impacting internal velocity and suspended sediment concentration (SSC) structures; (iii) vertical profiles of current, salinity and SSC within a river plume are dependent on a correct prediction of the development of turbulence; (iv) both suspended particulate matter availability and local residual flow regime are of critical importance for trapping probability of sediment and the occurrence of fluid mud; (v) river discharge impacts the horizontal and vertical distribution of residual current; (vi) seasonally varying wind effect alters the residual currents near the riverine limit; (vii) seasonally varied mean sea level and wind climate jointly shape the saltwater intrusion length near the estuarine front.
Treatise On Estuarine And Coastal Science
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Author :
language : en
Publisher: Academic Press
Release Date : 2012-03-06
Treatise On Estuarine And Coastal Science written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-03-06 with Science categories.
The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics
Developing Efficient High Order Transport Schemes For Cross Scale Coupled Estuary Ocean Modeling
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Author : Fei Ye
language : en
Publisher:
Release Date : 2017
Developing Efficient High Order Transport Schemes For Cross Scale Coupled Estuary Ocean Modeling written by Fei Ye and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Estuaries categories.
Geophysical fluid dynamics (GFD) models have progressed greatly in simulating the world’s oceans and estuaries in the past three decades, thanks to the development of novel numerical algorithms and the advent of massively parallel high-performance computing platforms. Study of inter-related processes on multi-scales (e.g., between large-scale (remote) processes and small-scale (local) processes) has always been an important theme for GFD modeling. For this purpose, models based on unstructured-grid (UG) have shown great potential because of their superior abilities in enabling multi-resolution and in fitting geometry and boundary. Despite UG models’ successful applications on coastal systems, significant obstacles still exist that have so far prevented UG models from realizing their full cross-scale capability. The pressing issues include the computation overhead resulting from large contrasts in the spatial resolutions, and the relative lack of skill for UG model in the eddying regime. Specifically for our own implicit UG model (SCHISM), the transport solver often emerges as a major bottleneck for both accuracy and efficiency. The overall goal of this dissertation is two-fold. The first goal is to address the challenges in tracer transport by developing efficient high-order schemes for the transport processes and test them in the framework of a community supported modeling system (SCHISM: Semi-implicit Cross-scale Hydroscience Integrated System Model) for cross-scale processes. The second goal is to utilize the new schemes developed in this dissertation and elsewhere to build a bona fide cross-scale Chesapeake Bay model and use it to address some key knowledge gaps in the physical processes in this system and to better assist decision makers of coastal resource management. The work on numerical scheme development has resulted in two new high-order transport solvers. The first solver tackles the vertical transport that often imposes the most stringent constraint on model efficiency (Chapter 2). With an implicit method and two flux limiters in both space and time, the new TVD2 solver leads to a speed-up of 1.6-6.0 in various cross-scale applications as compared to traditional explicit methods, while achieving 2nd-order accuracy in both space and time. Together with a flexible vertical gridding system, the flow over steep slopes can be faithfully simulated efficiently and accurately without altering the underlying bathymetry. The second scheme aims at improving the model skill in the eddying ocean (Chapter 4). UG coastal models tend to under-resolve features like meso-scale eddies and meanders, and this issue is partially attributed to the numerical diffusion in the transport schemes that are originally developed for estuarine applications. To address this issue, a 3rd-order transport scheme based on WENO formulation is developed, and is demonstrated to improve the meso-scale features. The new solvers are then tested in the Chesapeake Bay and adjacent Atlantic Ocean on small, medium and large domains respectively, corresponding to the three main chapters of this dissertation (Chapter 2-4), with an ultimate goal of achieving a seamless cross-scale model from the Gulf Stream to the shallow regions in the Bay tributaries and sub-tributaries. We highlight the dominant role played by the bathymetry in nearshore systems and the detrimental effects of bathymetric smoothing commonly used in many coastal models (Chapter 3). With the new methods developed in this dissertation and elsewhere, the model has enabled the analyses on some important processes that are hard to quantify with traditional techniques, e.g., the effect of channel-shoal contrast on lateral circulation and salinity distribution, hypoxia volume, the influence of realistic bathymetry on the freshwater plume etc. Potential topics for future research are also discussed at the end. In addition, the new solvers have also been successfully exported to many other oceanic and nearshore systems around the world via user groups of our community modeling system (cf. ‘Publications’ under ‘schism.wiki’).
Three Dimensional Modelling Of Hydrodynamics And Tidal Flushing In Deep Bay
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Author : Aiguo Qian
language : en
Publisher:
Release Date : 2017-01-27
Three Dimensional Modelling Of Hydrodynamics And Tidal Flushing In Deep Bay written by Aiguo Qian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.
This dissertation, "Three-dimensional Modelling of Hydrodynamics and Tidal Flushing in Deep Bay" by Aiguo, Qian, 乾愛國, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Three-Dimensional Modelling of Hydrodynamics and Tidal Flushing in Deep Bay" submitted by QIAN Aiguo for the degree of Master of Philosophy at the University of Hong Kong in December, 2003 Deep Bay is a semi-enclosed shallow bay on the eastern side of the Pearl Estuary, between Shenzhen to the north and the New Territories of Hong Kong to the south. As a result of large-scale development in Shenzhen, Deep Bay has experienced severe water quality deterioration in recent years. Some isolated water quality studies of Deep Bay have been conducted. However, Deep Bay is a unique embayment which exhibits large seasonal salinity variation, and no three-dimensional (3D) modeling of the tidal flushing process has yet been done. The flushing time, a key parameter that governs water quality and biological processes, needs to be quantified using a robust 3D hydrodynamic model. In the present study, a 3D hydrodynamic model of Deep Bay is developed and the 3D salinity and tidal circulation of the bay are systematically discussed. The flushing and dispersion features are studied, and the tidal flats in inner Deep Bay are simulated. The Environmental Fluid Dynamic Code (EFDC) is used to develop the 3D hydrodynamic model of Deep Bay. The topographical configuration, space and time scales, boundaries and boundary conditions are selected based on physical consideration and extensive numerical tests. The model is calibrated and verified against two different field data sets respectively for the dry and wet season. The effect of salinity on velocity field is also examined via a numerical experiment by eliminating any salinity gradient from the measured wet season tidal conditions. The analysis of field measurements and numerical modeling is synthesized, and it is demonstrated that the flows within Deep Bay are characteristic of a well mixed/weakly stratified estuary. The small freshwater flows make insignificant contribution to the salinity structure of the outer Deep Bay area, which is mainly influenced by the inflow introduced from the Pearl Estuary. Based on the validated hydrodynamic model, the tidal flushing is studied using a 3D conservative mass transport model. The flushing times of different parts of Deep Bay are quantified via systematic numerical simulation including: i) real tidal forcing on Deep Bay model and ii) typical M2 tides on a local model with only one tidal open boundary. It is demonstrated that the flushing rate is approximately 0.04 per day (flushing time 25 days) in the inner bay, and increases beyond the middle bay rapidly, to 0.3-0.4 per day at the outer end. The flushing rate is significantly affected in both the dry and wet season by salinity gradients. The dispersion of a continuous pollutant source into Deep Bay is also studied. It is demonstrated that this dispersion conforms to the flushing features within the bay. The source remains in the inner bay area with a high concentration, but is rapidly diluted beyond the Shekou cape cross section of middle Deep Bay. It is therefore demonstrated that severe water quality deterioration in Deep Bay occurs mainly in its inner bay area, and that any "red tide" occurring from time to time in inner Deep Bay will not spread to the bay as a whole. DOI: 10.5353/th_b2979900 Subjects: Hydrodynamics - Computer sim
Handbook Of Environmental Fluid Dynamics Volume Two
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Author : Harindra Joseph Fernando
language : en
Publisher: CRC Press
Release Date : 2012-12-12
Handbook Of Environmental Fluid Dynamics Volume Two written by Harindra Joseph Fernando and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-12 with Science categories.
With major implications for applied physics, engineering, and the natural and social sciences, the rapidly growing area of environmental fluid dynamics focuses on the interactions of human activities, environment, and fluid motion. A landmark for the field, the two-volume Handbook of Environmental Fluid Dynamics presents the basic principles, fundamental flow processes, modeling techniques, and measurement methods used in the study of environmental motions. It also offers critical discussions of environmental sustainability related to engineering. The handbook features 81 chapters written by 135 renowned researchers from around the world. Covering environmental, policy, biological, and chemical aspects, it tackles important cross-disciplinary topics such as sustainability, ecology, pollution, micrometeorology, and limnology. Volume Two: Systems, Pollution, Modeling, and Measurements explores the interactions between engineered structures and anthropogenic activities that affect natural flows, with particular emphasis on environmental pollution. The book covers the numerical methodologies that underpin research, predictive modeling, and cyber-infrastructure developments. It also addresses practical aspects of laboratory experiments and field observations that validate quantitative predictions and help identify new phenomena and processes. As communities face existential challenges posed by climate change, rapid urbanization, and scarcity of water and energy, the study of environmental fluid dynamics becomes increasingly relevant. This volume is a valuable resource for students, researchers, and policymakers working to better understand environmental motions and how they affect and are influenced by anthropogenic activities. See also Handbook of Environmental Fluid Dynamics, Two-Volume Set and Volume One: Overview and Fundamentals.
Selected Water Resources Abstracts
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Author :
language : en
Publisher:
Release Date : 1990
Selected Water Resources Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Hydrology categories.