Download or read book Development sic and Application of a Three Dimensional Numerical Model for Predicting Pollutant and Sediment Transport Using an Eulerian lagrangian Marker Particle Technique written by Danny L. Pavish and published by . This book was released on 1976 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Three dimensional Numerical Model for Predicting Pollutant and Sediment Transport Using an Eulerian Lagrangian Marker Particle Technique written by Danny Pavish and published by . This book was released on 1977 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Modeling of Pollutant Transport Using a Lagrangian Marker Particle Technique written by Malcolm L. Spaulding and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of a Sediment Transport Model for Field Application written by S. Y. Wang and published by . This book was released on 1987 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three dimensional Numerical Modelling of Sediment Transport Processes in Non stratified Estuarine and Coastal Waters written by Cahyono and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Details are given herein of the development, refinement and application of a higher-order accurate 3-D finite difference model for non-cohesive suspended sediment transport processes, in non-stratified estuarine and coastal waters. The velocity fields are computed using a 2-D horizontal depth-integrated model, in combination with either an assumed Iogarithmic velocity profile or a velocity profile obtained from field data. Also, for convenience in handling variable bed topographies and for better vertical resolution, a sigma-stretching co-ordinate system has been used. In order to gain insight into the relative merits of various numerical schemes for modelling the convection of high concentration gradients, in terms of both accuracy and efficiency, thirty six existing finite difference schemes and two splitting techniques have been reviewed and compared by applying them to the following cases:....

Download or read book SED3D a Three dimensional Numerical Model of Hydrodynamics and Sediment Transport in Lakes and Estuaries written by Y. Peter Sheng and published by . This book was released on 1991* with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Pollutant Transport Using a Meshless lagrangian Particle Model written by and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A combined meshless-Lagrangian particle transport model is used to predict pollutant transport over irregular terrain. The numerical model for initializing the velocity field is based on a meshless approach utilizing multiquadrics established by Kansa. The Lagrangian particle transport technique uses a random walk procedure to depict the advection and dispersion of pollutants over any type of surface, including street and city canyons.

Download or read book Advances in Analytical and Numerical Dispersion Modeling of Pollutants Releasing from an Area source written by Praneeth Nimmatoori and published by . This book was released on 2014 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The air quality near agricultural activities such as tilling, plowing, harvesting, and manure application is of main concern because they release fine particulate matter into the atmosphere. These releases are modeled as area-sources in the air quality modeling research. None of the currently available dispersion models relate and incorporate physical characteristics and meteorological conditions for modeling the dispersion and deposition of particulates emitting from such area-sources. This knowledge gap was addressed by developing the advanced analytical and numerical methods for modeling the dispersion of particulate matter. The development, application, and evaluation of new dispersion modeling methods are discussed in detail in this dissertation. In the analytical modeling, a ground-level area source analytical dispersion model known as particulate matter deposition - PMD was developed for predicting the concentrations of different particle sizes. Both the particle dynamics (particle physical characteristics) and meteorological conditions which have significant effect on the dispersion of particulates were related and incorporated in the PMD model using the formulations of particle gravitational settling and dry deposition velocities. The modeled particle size concentrations of the PMD model were evaluated statistically after applying it to particulates released from a biosolid applied agricultural field. The evaluation of the PMD model using the statistical criteria concluded effective and successful inclusion of dry deposition theory for modeling particulate matter concentrations. A comprehensive review of analytical area-source dispersion models, which do not account for dry deposition and treat pollutants as gases, was conducted and determined three models - the Shear, the Parker, and the Smith. A statistical evaluation of these dispersion models was conducted after applying them to two different field data sets and the statistical results concluded that the Shear model performed the best out of the three dispersion models. The algorithms of each dispersion model were analyzed and it was determined that the best performance of the Shear model was due to incorporation of a variation of wind speed and vertical eddy diffusivity (atmospheric turbulence) with the height above ground surface. A new methodology was developed using computational fluid dynamics (CFD) - FLUENT for the numerical dispersion modeling of particulate matter emitting from an area-source (biosolids applied agricultural field). The discrete phase model (Lagrangian -Eulerian approach) was used in combination with each of the four turbulence models: Standard ke (ke), Realizable ke (Rke), Standard k¿ (k¿), and Shear-stress transport k-¿ (SST) to predict particulate matter size concentrations for distances downwind of the agricultural field. In this modeling approach, particulates were simulated as discrete phase and air as continuous phase. The discrete phase model accounted for the effects of atmospheric turbulence and drag force which is dependent on particle physical characteristics (diameter, density, and velocity), gravitational velocity, and air viscosity for predicting the trajectories of particles. The modeled particulate matter concentrations were compared statistically with their corresponding field study observations to evaluate the performance of proposed CFD model using the four turbulence models. The statistical analysis concluded that among four turbulence models, the discrete phase model when used with Rke performed the best in predicting particulate matter concentrations for low (u 2 m/s) and medium (2

Download or read book A Three dimensional Numerical Model for Simulating Flow and Sediment Transport Processes in Fluvial and Deltaic Environments written by Shao-ou Chin and published by . This book was released on 1997 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Particle Models for Transport in Three dimensional Shallow Water Flow written by D. W. Dunsbergen and published by . This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three dimensional Numerical Modelling of Sediment Transport Processes in Non stratified Estuarine and Coastal Waters written by M. Cahyono and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Eulerian Lagrangian Analysis of Pollutant Transport in Shallow Water written by Antonio E. de M. Baptista and published by . This book was released on 1984 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical method for the solution of the two-dimensional, unsteady, transport equation is formulated, and its accuracy is tested. The method uses a Eulerian-Lagrangian approach, in which the transport equation is divided into a diffusion equation (solved by a finite element method) and a convection equation (solved by the method of characteristics). This approach leads to results that are free of spurious oscillations and excessive numerical damping, even in the case where advection strongly dominates diffusion. For pure diffusion problems, optimal accuracy is approached as the time-step, At, goes to zero; conversely, for pure-convection problems, accuracy improves with increasing At; for convection-diffusion problems the At leading to optimal accuracy depends on the characteristics of the spatial discretization and on the relative importance of convection and diffusion. The method is cost-effective in modeling pollutant transport in coastal waters, as demonstrated by two prototype applications: hypothetical sludge dumping in Massachusetts Bay and the thermal discharge from Brayton Point Generating Station in Narragansett Bay. Numerical diffusion is eliminated or greatly reduced, raising the need for realistic estimation of dispersion coefficients. Costs (based on CPU time) should not exceed those of conventional Eulerian methods and, in some cases (e.g., problems involving predictions over several tidal cycles), considerable savings may even be achieved.

Download or read book Sediment Transport written by Silvia Susana Ginsberg and published by IntechOpen. This book was released on 2011-04-26 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sediment transport is a book that covers a wide variety of subject matters. It combines the personal and professional experience of the authors on solid particles transport and related problems, whose expertise is focused in aqueous systems and in laboratory flumes. This includes a series of chapters on hydrodynamics and their relationship with sediment transport and morphological development. The different contributions deal with issues such as the sediment transport modeling; sediment dynamics in stream confluence or river diversion, in meandering channels, at interconnected tidal channels system; changes in sediment transport under fine materials, cohesive materials and ice cover; environmental remediation of contaminated fine sediments. This is an invaluable interdisciplinary textbook and an important contribution to the sediment transport field. I strongly recommend this textbook to those in charge of conducting research on engineering issues or wishing to deal with equally important scientific problems.

Download or read book Prediction of Regional Pollutant Dispersion Using a Nested grid Three Dimensional Numerical Model written by Kung Wei Yeh and published by . This book was released on 1987 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Sediment Transport with Meshfree Methods written by David Vetsch and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2012-07 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: The assessment of sediment transport and involved processes is a major issue in hydraulic and river engineering. Common approaches for sediment transport which rely on empirical relations are not able to describe the underlying physics in detail and they are not suitable to study the generally complex sediment transport processes. However, numerical models which are able to reproduce and to resolve the involved processes are not very common, since they would have to imply the rather complex fluid-sediment interaction. In the present work, a numerical model which is based on a Lagrangian approach with force-coupling, namely the combination of two meshfree particle methods, is presented. The fluid is modelled by a continuum approach which is discretised by the smoothed particle hydrodynamics method. The sediment particles are represented by the discrete element method. The definition of the interface and the exchange of forces between the fluid and sediment grains are inherent to the applied approaches. The present contribution shows the potential of the presented model for the detailed investigation of sediment transport processes as well as for complex practical applications.

Download or read book A Three dimensional Numerical Model for Simulation of Sediment Movements in Water Intakes written by Nils Reidar B. Olsen and published by . This book was released on 1991 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Seameo Tropmed Technical Meeting on Advanced Knowledge on the Vaccines for Tropical Deseases of Public Health Importance in Southeast Asia written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: