Download or read book Mixing and Deposition of Sediment Laden Buoyant Jets written by Shu-Ning Chan and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Mixing and Deposition of Sediment-laden Buoyant Jets" by Shu-ning, Chan, 陳樹寧, 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: Sediment-laden turbulent buoyant jets are commonly encountered in the natural and man-made environments. Examples of sediment-laden buoyant jets include volcanic eruptions, deep ocean hydrothermal vents ("black smokers"), ocean dumping of dredged spoils and sludge, and submarine discharge of wastewater effluent. It is important to understand the fluid mechanics of sediment jets for environmental impact assessment, and yet there is currently no general model for predicting the mixing of sediment-laden jets. This study reports a theoretical and experimental investigation the sediment mixing, fall-out and deposition from sediment-laden buoyant jets. It is well known that turbulence generates fluctuations to the particle motion, modulating the particle settling velocity. A general three-dimensional (3D) stochastic particle tracking model is developed to predict the particle settling out and deposition from a sediment-laden jet. Particle velocity fluctuations are modelled by a Lagrangian velocity autocorrelation function that accounts for the loitering and trapping of sediment particles in turbulent eddies which results in the reduction of settling velocity. The model is validated against results of independent experimental studies. Consistent with basic experiments using grid-generated turbulence, the model predicts that the apparent settling velocity can be reduced by as much as 30% of the stillwater settling velocity. The mixing and deposition of sediment-laden horizontal momentum jets are studied using laboratory experiments and 3D computational fluid dynamics (CFD) modelling. It is shown that there is a significant settling velocity reduction up to about 25-35%, dependent on jet turbulent fluctuations and particle properties. The CFD approach necessitates an ad hoc adjustment/reduction on settling velocity and lacks generality. Using classical solutions of mean velocity, and turbulent fluctuation and dissipation rate profiles derived from CFD solutions, 3D particle tracking model predictions of sediment deposition and concentration profiles are in excellent agreement with measured data over a wide range of jet flow and particle properties. Unlike CFD calculations, the present method does not require any a priori adjustment of particle settling velocity. A general particle tracking model for predicting sediment fall-out and deposition from an arbitrarily inclined buoyant jets in stagnant ambient is successfully developed. The model incorporates the three flow regimes affecting the sediment dynamics in a buoyant jet, namely turbulent jet flow, jet entrainment-induced external flow and surface spreading current. The jet mean flow velocity is determined using a well-validated jet integral model. The external jet-induced irrotational flow field is computed by a distribution of point sinks along the jet trajectory. The surface spreading current is predicted using an integral model accounting for the interfacial shear. The model is validated against experimental data of sediment deposition from vertical and horizontal sediment-laden buoyant jets. DOI: 10.5353/th_b5060572 Subjects: Sediment transport - Mathematical models Suspended sediments - Mathematical models Waste disposal in the ocean - Mathematical models Jets - Fluid dynamics

Download or read book Mixing and Deposition of Sediment laden Buoyant Jets written by Shu-ning Chan and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mixing and Deposition of Sediment laden Buoyant Jets written by Shu-ning Chan and published by . This book was released on 2013 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mixing of Horizontal Sediment Laden Jets written by Wing-Yan Lee and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Mixing of Horizontal Sediment Laden Jets" by Wing-yan, Lee, 李永仁, 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. DOI: 10.5353/th_b4607802 Subjects: Sediment transport - Mathematical models Suspended sediments - Mathematical models Waste disposal in the ocean - Mathematical models Jets - Fluid dynamics

Download or read book Cohesive sedimentary systems Dynamics and deposits written by Andrew James Manning and published by Frontiers Media SA. This book was released on 2024-01-30 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mixing in Stratified and Sediment Laden Flows written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of research carried out during the past year were to understand entrainment processes across density interfaces subjected to differential turbulent forcing; and to develop theoretical and laboratory-based descriptions for internal waves and mixing processes resulting from the interaction between turbulence and stratification. The first part of the study is applicable to the evolution of density step structures observed in the atmosphere and oceans, which consist of turbulent layers separated by density interfaces (Padman & Dillon 1989, J. Phys. Oceanogr., 18, 1458-1462). The second investigation is aimed toward parameterization of processes occurring at the oceanic convective layers, for example, the night-time boundary layer where cooling-induced convection plays a significant role in the generation of turbulence.

Download or read book Sedimentology and Sedimentary Basins written by Mike R. Leeder and published by John Wiley & Sons. This book was released on 2009-04-01 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sedimentology is a core discipline of earth and environmental sciences. It enquires the origins, transport and deposition of mineral sediment on the Earth's surface. The subject is a link between positive effects arising from the building of relief by tectonics and the negative action of denudation in drainage catchments and tectonic subsidence in sedimentary basins. The author addresses the principles of the subject, emphasising the advantages of a general science approach and the importance of understanding modern processes. Sedimentology and Sedimentary Basins is not an encyclopaedia, but attempts to stimulate interdisciplinary thought across the whole subject area and related disciplines. The book has been designed to meet the needs of earth and environmental science undergraduates.

Download or read book Physical Processes in Earth and Environmental Sciences written by Mike R. Leeder and published by John Wiley & Sons. This book was released on 2009-04-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a sound introduction to the basic physicalprocesses that dominate the workings of the Earth, its atmosphereand hydrosphere. It systematically introduces the physicalprocesses involved in the Earth’s systems without assuming anadvanced physics or mathematical background. Offers an integrated approach to the study of earth, marine andatmospheric environmental sciences, reflecting current trends inundergraduate courses. Natural examples of physical processes, rather than abstractphysics and maths, are used throughout to illustrate the scientificprinciples involved. Artwork from the book is available to instructors online atwww.blackwellpublishing.com/leeder.

Download or read book Asian And Pacific Coasts 2011 Proceedings Of The 6th International Conference written by Joseph Hun-wei Lee and published by World Scientific. This book was released on 2011-11-24 with total page 2187 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a compilation of papers presented at the 6th International Conference on Asian and Pacific Coasts (APAC2011) held on December 14-16, 2011 in Hong Kong, China. It contains more than 200 articles addressing a wide spectrum of issues, ranging from conventional coastal engineering problems (such as wave hydrodynamics and sediment transport) to issues of contemporary interest (such as tsunami, coastal development, climate change and seawater level rise, shoreline protection, marine energy, nearshore ecology, oil spill, etc.). Authors present their experiences in tackling these problems, by means of theoretical modeling, numerical simulation, laboratory and field observations, with an aim to advance fundamental understanding of the controlling mechanisms, as well as to develop solutions for practical designs. This volume serves to promote technological progress and activities, technical knowledge transfer and cooperation on an international scale.

Download or read book Mixing of Horizontal Sediment Laden Jets written by Wing-yan Lee (civil engineer.) and published by . This book was released on 2010 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Buoyant Jet Flows and Mixing in Stratified Lakes Reservoirs Or Ponds written by Ruochuan Gu and published by . This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estuaries and Coastal Zones in Times of Global Change written by Kim Dan Nguyen and published by Springer Nature. This book was released on 2020-02-28 with total page 843 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of extended papers based on presentations given during the ICEC 2018 conference, held in Caen, France, in August 2018. It explores both the limitations and advantages of current models, and highlights the latest developments concerning new numerical schemes, high-performance computing, multi-physics and multi-scale methods, and better interaction with field or scale model data. Accordingly, it addresses the interests of practitioners, stakeholders, researchers, and engineers active in this field.

Download or read book Transport and Fate of Chemicals in the Environment written by John S. Gulliver and published by Springer Science & Business Media. This book was released on 2012-12-12 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: What happens when a chemical is released into the environment? It diffuses, disperses, adsorbs, reacts, and/or changes state. To predict and analyze this process, the mathematics of diffusion is applied to lakes, rivers, groundwater, the atmosphere, the oceans, and transport between these media. A sustainable world requires a deep understanding of the transport of chemicals through the environment and how to address and harness this process. This volume presents a succinct and in-depth introduction to this critical topic. Featuring authoritative, peer-reviewed articles from the Encyclopedia of Sustainability Science and Technology, Transport and Fate of Chemicals in the Environment represents an essential one-stop reference for an audience of researchers, undergraduate and graduate students, and industry professionals.

Download or read book Global Geomorphology written by Michael A. Summerfield and published by Routledge. This book was released on 2014-05-12 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plate tectonics revolution in the earth sciences has provided a valuable new framework for understanding long-term landform development. This innovative text provides a comprehensive introduction to the subject of global geomorphology, with the emphasis placed on large-scale processes and phenomena. Integrating global tectonics into the study of landforms and incorporating planetary geomorphology as a major component the author discusses the impact of climatic change and the role of catastrophic events on landform genesis and includes a comprehensive study of surface geomorphic processes.

Download or read book Comptes Rendus written by International Association for Hydraulic Research. Congress and published by . This book was released on 1985 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Buoyant Jets in Temperature stratified Ambients and Applications to Mixing of Lakes and Reservoirs written by Ruochuan Gu and published by . This book was released on 1987 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1986 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: