Download or read book A Numerical Study of the Mid field River Plume written by Kelly Lynne Cole and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Idealized and realistic simulations of the Merrimack River plume on the east coast of the U.S. are performed using the Regional Ocean Modeling System (ROMS). The effect of discharge, tides and rotation on the evolution of the tidal plume are examined. Experiments investigating the deceleration of the plume body through mixing and the relaxation of the tidal plume front are performed. Three primary findings result from this research. First, more ambient water interacts with the tidal plume front than source water. Because it takes several hours for source water to translate the plume and it is strongly diluted in the plume interior, only a small fraction of source water reaches the front. Therefore, the front is responsible for a small portion of mixing of the total ebb discharge. Second, the mouth and the tidal plume front communicate on an advective time scale. When the ebb discharge is stopped at the estuary mouth, the inertia of the discharge is enough to keep previously released source water necessary to sustain frontal propagation moving frontward. The front begins to slow when the withheld estuarine discharge is not supplied to the front. Third, the net plume mixing, defined as the total mixing of a parcel of source water before it enters the far-field, is altered by rotation. As discharge increases, an irrotational plume will exhibit an increasing trend in net mixing, while a rotational plume will exhibit a decreasing trend. These experiments bridge engineering and geophysical scale plume studies and provide a framework for understanding results reported in literature. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/152637
Download or read book The Mathematics of Marine Modelling written by Henk Schuttelaars and published by Springer Nature. This book was released on 2022-11-30 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few decades, numerical simulation has become instrumental in understanding the dynamics of seas, coastal regions and estuaries. The decision makers rely more and more frequently on model results for the management of these regions. Some modellers are insufficiently aware of the theoretical underpinning of the simulation tools they are using. On the other hand, a number of applied mathematicians tend to view marine sciences as a domain in which they would like to use the tools they have a good command of. Bridging the gap between model users and applied mathematicians is the main objective of the present book. In this respect a vast number of issues in which mathematics plays a crucial role will be addressed.
Download or read book Numerical Modelling of the Grand River Plume in Lake Erie During Unstratified Period written by Cheng He and published by . This book was released on 2003 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: "To better understand the impact of Grand River plume on the surrounding receiving waters, a combined observational and modeling study of the Grand River plume transport in the eastern basin of Lake Erie has been conducted for late spring of 2001 using a high resolution depth-integrated nonlinear barotropic finite element model. Due to the lack of observations needed for specifying the open boundary conditions, an extended domain of receiving waters with closed boundary was applied in this numerical study"--Abstract.
Download or read book River Plumes and Estuaries written by Alexander Osadchiev and published by Frontiers Media SA. This book was released on 2022-09-01 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of the Near Field Unsteady Dynamics of Planar Plumes written by M. C. Soteriou and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non hydrostatic Numerical Study of Hyperpycnal River Plumes on Sloping Continental Shelves written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics and Numerical Modeling of River Plumes in Lakes written by Navid Nekouee and published by . This book was released on 2010 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Models of the fate and transport of river plumes and the bacteria they carry into lakes are developed. They are needed to enable informed decisions about beach closures to avoid economic losses, and to help design water intakes and operate combined sewer overflow schemes to obviate exposure of the public to potential pathogens. This study advances our understanding of river plumes dynamics in coastal waters by means of field studies and numerical techniques. Extensive field measurements were carried out in the swimming seasons of 2006 and 2007 on the Grand River plume as it enters Lake Michigan. They included simultaneous aerial photography, measurements of lake physical properties, the addition of artificial tracers to track the plume, and bacterial sampling. Our observed results show more flow classes than included in previous studies (e.g. CORMIX). Onshore wind can have a significant effect on the plume and whether it impacts the shoreline. A new classification scheme based on the relative magnitude of plume-crossflow length scale and Richardson number based on the wind speed is devised. Previous studies on lateral spreading are complemented with a new relationship in the near field. The plume thickness decreased rapidly with distance from the river mouth and a new non-dimensional relationship to predict thickness is developed. Empirical near field models for surface buoyant plumes are reviewed and a near field trajectory and dilution model for large aspect ratio surface discharge channels is devised. Bacterial reductions due to dilution were generally small (less than 10:1) up to 4.5 km from the river mouth. E. coli decay rates were significantly affected by solar radiation and ranged from 0.2 to 2.2 day-1 which were within the range of previous studies in Lake Michigan. Total coliform survived longer than E. coli suggesting different die-off mechanisms. Mathematical models of the bacterial transport are developed that employ a nested modeling scheme to represent the 3D hydrodynamic processes of surface river discharges in the Great Lakes. A particle tracking model is used that provides the capability to track a decaying tracer and better quantify mixing due to turbulent diffusion. Particle tracking models have considerable advantages over gradient diffusion models in simulating bacterial behavior nearshore that results in an improved representation of bacteria diffusion, decay and transport. Due to the complexity and wide variation of the time and length scale of the hydrodynamic and turbulent processes in the near field (where plume mixing is dominated by initial momentum and buoyancy) and far field (where plume mixing is dominated by ambient turbulence), a coupling technique is adapted. The far field random walk particle tracking model incorporates the empirical near field model. It simulates the transport, diffusion and decay of bacteria as discrete particles and employs the near field output as the source and transports the particles based on ambient currents predicted by the 3D hydrodynamic model. The coupled model improves dilution predictions in the near field. The new techniques advance our knowledge of the nearshore fate and transport of bacteria in the Great Lakes and can be ultimately applied to the NOAA Great Lakes Coastal Forecasting System to provide a reliable prediction tool for bacterial transport in recreational waters."--Summary.
Download or read book A numerical study of three dimensional dense bottom plumes on a Southern Ocean continental slope written by L. JIANG and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biogeochemical Dynamics at Major River Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.
Download or read book Numerical Modelling and Field Study of Thermal Plume Dispersion in Rivers and Coastal Waters written by Abolghasem Pilechi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Papers from the 15th Estuarine and Coastal Modeling Conference written by Richard P. Signell and published by MDPI. This book was released on 2019-07-30 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue Selected Papers from the 15th Estuarine and Coastal Modeling Conference that was published in JMSE
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrodynamics and Water Environment Characteristics in Coastal Areas under the Influences of Climate Change and Human Activities written by Sha Lou and published by Frontiers Media SA. This book was released on 2023-05-09 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Study of the Rise of Smoke stack Plumes written by Ramesh Krishnamurthy and published by . This book was released on 1981 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of a Confined Thermal Plume at Different Flow Regimes Under the Influence of Gas Radiation written by Ying Wang and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a numerical investigation of a confined thermal plume under the influence of gas radiation. Plumeflow is generated by a linear heat source of constant power density immersed in a cubic cavity. The main aim of this thesis is to characterize the evolution of the plume throughout its transition from steady-state to turbulent regime, and to explore the gas radiation effects on flow stability, heat transfers, thermal and kinetic fields of the plume. DNS numerical simulations are performed over a Rayleigh number range from 106 to 109 by applying a finite volume CFD software coupled to a module for radiative heat transfer calculations. The pure convective situation is studied first to characterize the thermal and kinetic fields of the plume in different flow regimes. Next, the convection-radiation coupling is introduced by considering either gray gas or real gas (air - H2O mixture) media. The effects of optical thickness are analyzed in details for gray gas model. Results show that gas radiation stabilizes the plume flow and delays the onset of unsteadiness. Gas radiation also homogenizes the thermal field and reduces its spatial spreading. However, radiation effect on the kinetic field depends on the flow state. For steady state, gas radiation decreases the global flow circulation while for transient and turbulent states, it enhances the flow dynamics in optically thin medium.These general trends of radiation are also confirmed in real gas mixture through a parametric study of water vapor concentration and reference temperature.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
