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Development Of A One Dimensional Subsurface Contaminant Transport Model With Stochastic Applications
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Book Synopsis Development of a One Dimensional Subsurface Contaminant Transport Model with Stochastic Applications by : Benjamin Waldon Johnson
Download or read book Development of a One Dimensional Subsurface Contaminant Transport Model with Stochastic Applications written by Benjamin Waldon Johnson and published by . This book was released on 2009 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Contaminant source release history is a necessary element of contaminant mass transport simulation in the saturated zone. The source release history is unknown at many sites, and many inverse models have been developed to define finite release histories. To define a likely domain of three source history parameters, a mass balancebased one dimensional approach is developed and tested by discretizing the spatial domain into bands. By incorporating the approach in a spreadsheet model, observed data is represented by both variable length and constant length bands of analysis. Each representation of observed data was tested to determine the most appropriate band geometry for improved model calibration and constant length bands results were more accurate than results of variable length bands. The source history parameter domains predicted by the model are then evaluated with Monte Carlo analysis. After datasets of artificial transport systems are developed and evaluated with the model, actual site data from a Superfund site is input to the model that provides reasonable results of the source history parameters. Limitations of the model require site characteristics that include negligible diffusion, a uniform regional flow field, and isotropic and homogeneous aquifer media"--Abstract, leaf iv.
Book Synopsis Numerical Model for One-dimensional Stochastic Contaminant Transport in Fractional Time-space by : Mayank Mehta
Download or read book Numerical Model for One-dimensional Stochastic Contaminant Transport in Fractional Time-space written by Mayank Mehta and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The groundwater contaminant transport has been analyzed for stationary (steady) and non-stationary (unsteady) flow of velocity. This velocity has been considered for both deterministic and stochastic flows, and the stochasticity has been generated through both Brownian motion (Gaussian) and fractional Brownian motion (heavy tailed). The variance behavior for stationary and non-stationary flow having heavy tailed and Brownian motion has been analyzed. The correlation in the velocity has been accessed through the covariance behavior. Furthermore, diffusion coefficient has been analyzed for various flow processes. A numerical model has been developed using one dimensional unsteady fractional stochastic transport equation to generate the realization-wise concentration of contaminants using Monte Carlo simulations. Then, the ensemble average of the realizations have been found, which is equivalent to the probability density function (PDF) of the concentration of contaminants. Fokker-Plank equation has been modeled numerically to generate PDF for the concentration of contaminants. It has been observed that the Fokker-Plank equation is describing well the ensemble average obtained by Monte Carlo simulations. Moreover, long memory has been observed for fractional cases, which explains the practically observed heavy tails in the transport process. Correlation function has been plotted for the ensemble of concentration to explain the physical basis for heavy tails observed in nature.
Book Synopsis Moment Analysis for Subsurface Hydrologic Applications by : Rao S. Govindaraju
Download or read book Moment Analysis for Subsurface Hydrologic Applications written by Rao S. Govindaraju and published by Springer Science & Business Media. This book was released on 2007-06-21 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the concept of moments, and how they find application in subsurface hydrologic problems-particularly those dealing with solute transport. Both temporal and spatial moments are dealt with in some detail for a wide variety of problems. Several examples using experimental data, both from laboratory columns and field experiments, are provided to give the readers a clear idea about the scope of this method.
Book Synopsis Subsurface Solute Transport Models and Case Histories by : Vyacheslav G. Rumynin
Download or read book Subsurface Solute Transport Models and Case Histories written by Vyacheslav G. Rumynin and published by Springer Science & Business Media. This book was released on 2012-01-14 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book addresses the development of the basic knowledge of the subsurface solute transfer with a particular emphasis on field data collection and analysis coupled with modeling (analytical and numerical) tool application. The relevant theoretical developments are concerned mainly with the formulation and solution of deterministic mass-transport equations for a wide range of engineering issues in groundwater quality assessment and forecasting. The book gives many computational examples and case studies drawn from the conducted field investigations. The analyzed problems are as follows: investigation and prediction of groundwater contamination by industrial contaminants and solutions (radionuclides, chloride and nitrate brine) with special focus on the effect of (a) aquifer heterogeneity, anisotropy, and dual porosity, (b) density contrast existing between industrial waste and groundwater, or in density-stratified artesian and coastal groundwater systems; (c) physicochemical interactions that play a major role in retarding (e.g. adsorption) or enhancing (e.g. interactions between dissolved species and mobile colloids) contaminant transport; prediction of the effects of pumping on groundwater quality at wellfields; groundwater dating using stable and radioactive isotopes for prediction and assessment of contamination potential; field and laboratory tests’ design and analysis, and monitoring data interpretation; partitioning of surface and subsurface flows using isotope techniques. One of the most essential topics addressed in the book is the migration and fate of radionuclides. Model development is motivated by field data analysis from a number of radioactively contaminated sites in the Russian Federation: near-surface radioactive waste disposal sites and deep-well radioactive waste injection sites. They play a unique role in the advancement of knowledge of the subsurface behavior and fate of many hazardous radionuclides and can be considered as field-scale laboratories. Thus, the book, along with theoretical findings, contains field information, which will facilitate the understanding of subsurface solute transport and the development of a methodology for practical applications to groundwater hydrology.
Book Synopsis Analytical Modeling of Solute Transport in Groundwater by : Mark Goltz
Download or read book Analytical Modeling of Solute Transport in Groundwater written by Mark Goltz and published by John Wiley & Sons. This book was released on 2017-02-28 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Teaches, using simple analytical models how physical, chemical, and biological processes in the subsurface affect contaminant transport Uses simple analytical models to demonstrate the impact of subsurface processes on the fate and transport of groundwater contaminants Includes downloadable modeling tool that provides easily understood graphical output for over thirty models Modeling tool and book are integrated to facilitate reader understanding Collects analytical solutions from many sources into a single volume and, for the interested reader, shows how these solutions are derived from the governing model equations
Book Synopsis Impacts of Spatio-Variability of Source Morphology on Field-Scale Predictions of Subsurface Contaminant Transport by :
Download or read book Impacts of Spatio-Variability of Source Morphology on Field-Scale Predictions of Subsurface Contaminant Transport written by and published by . This book was released on 1998 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project investigated the coupled effects of uncertain contaminant source morphology (organic immiscible liquids distribution and composition) and aquifer properties on predicting solute transport in saturated groundwater systems contaminated with residual Organic Immiscible Liquids (OIL's). Research efforts focused on the development of multiple stochastic inverse models for characterizing contaminant fluxes in the near field and for characterizing NAPL distributions within source. In addition, work was conducted on the forward stochastic modeling, that is, to evaluate individual and collective impacts of uncertain spatially and temporally variable source morphological characteristics on subsurface solute transport predictions. The study also involved 1-, 2-, and 3-dimensional experimental efforts to study bench-scale and intermediate-scale uncertainties associate with OIL sources. These studies focused on describing dissolution from multi-component OIL's at varying residual fluid saturations and distributions, and the characterization of OIL sources using partitioning and interfacial tracers. As a final component of the project, the various stochastic models developed were evaluated using data from the pilot-scale field experiments conducted at Hill AFB, Columbus AFB, and Base Borden, Ontario, Canada. Data derived from partitioning/interfacial tracers and far-field dissolved OIL component distributions were used with the stochastic models to characterize OIL sources at each site.
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface and Subsurface Flow and Contaminant Transport Modeling in Lower Altamaha Watershed by : Orhan Gunduz
Download or read book Surface and Subsurface Flow and Contaminant Transport Modeling in Lower Altamaha Watershed written by Orhan Gunduz and published by . This book was released on 2004 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a data evaluation/decision support system for remediation of subsurface contamination by :
Download or read book Development of a data evaluation/decision support system for remediation of subsurface contamination written by and published by DIANE Publishing. This book was released on with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Subsurface Transport and Fate Processes by : Robert C. Knox
Download or read book Subsurface Transport and Fate Processes written by Robert C. Knox and published by CRC Press. This book was released on 2018-01-10 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first comprehensive reference volume available on subsurface transport and fate processes. The volume is organized into four sections covering the basics of contaminant properties and how they affect transport and fate, the fundamental processes affecting subsurface transport and fate of contaminants, applications of transport and fate information to various contaminant types, and utilization of transport and fate information for predicting contaminant behavior. Specific topics such as traditional hydrodynamic processes of advection and dispersion, facilitated transport and contaminant flushing, and individual ground water contaminants are also explored in detail. Subsurface Transport and Fate Processes is ideal for environmental and ground water consultants, regulatory agency personnel, and educators in geology, hydrogeology, civil engineering, and environmental engineering.
Book Synopsis Stochastic Analysis of Contaminant Transport by :
Download or read book Stochastic Analysis of Contaminant Transport written by and published by . This book was released on 1990 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reliability approach for probabilistic modeling of one-dimensional non-reactive and reactive transport in porous media provides two important quantitative results: (1) an estimate of the probability that dimensionless concentration equals or exceeds some specified level and, (2) the sensitivity of the probabilistic outcome to likely changes in each uncertain variable. The reliability approach is particularly attractive because it can incorporate various marginal probability density functions (PDF) for any of the uncertain variables. In this work uncertain variables include: groundwater flow velocity, diffusion coefficient, dispersivity, distribution coefficient, porosity and bulk density. The primary objective is to examine how the probabilistic outcome is influenced by choice of marginal PDF, correlation and magnitude of uncertainty for the variables. Because little information exists concerning the statistical characteristics of these uncertain variables, the investigation assumes a wide range of PDF types and statistical values in order to identify and isolate the most critical issues for further study. Results indicate that, even for very slow mean velocity, the probability estimate for non-reactive transport is most sensitive to uncertain flow velocity. For practical analysis, it appears acceptable to treat dispersivity as a deterministic constant. For non-reactive transport, correlation between flow velocity and diffusion coefficient has a slight impact, but correlation among other combinations of uncertain variables is not important. 34 refs., 10 tabs.
Book Synopsis Stochastic Analysis of Contaminant Transport. Final Report, July 1, 1989--November 1, 1991 by :
Download or read book Stochastic Analysis of Contaminant Transport. Final Report, July 1, 1989--November 1, 1991 written by and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reliability algorithm is used to develop probabilistic (stochastic) models or contaminant transport in porous media. The models are based on advective-dispersive transport equations, and utilize the reliability algorithm with existing one- and two-dimensional analytical and numerical solutions. Uncertain variables in the models include: groundwater flow velocity (or permeability in the numerical model), dispersivity, diffusion coefficient, bulk density, porosity, and solute distribution coefficient. Each uncertain variable is assigned a mean, covariance, and marginal distribution. The models yield an estimate of the probability that the contaminant concentration will equal or exceed a target concentration at a selected location and time. The models also yield probabilistic sensitivity measures which identify those uncertain variables with most influence on the probabilistic outcome. The objective of this study is to examine the basic behavior and develop general conclusions regarding transport under certain conditions as modeled using a reliability approach.
Book Synopsis Modeling Groundwater Flow and Contaminant Transport by : Jacob Bear
Download or read book Modeling Groundwater Flow and Contaminant Transport written by Jacob Bear and published by Springer Science & Business Media. This book was released on 2010-01-18 with total page 851 pages. Available in PDF, EPUB and Kindle. Book excerpt: In many parts of the world, groundwater resources are under increasing threat from growing demands, wasteful use, and contamination. To face the challenge, good planning and management practices are needed. A key to the management of groundwater is the ability to model the movement of fluids and contaminants in the subsurface. The purpose of this book is to construct conceptual and mathematical models that can provide the information required for making decisions associated with the management of groundwater resources, and the remediation of contaminated aquifers. The basic approach of this book is to accurately describe the underlying physics of groundwater flow and solute transport in heterogeneous porous media, starting at the microscopic level, and to rigorously derive their mathematical representation at the macroscopic levels. The well-posed, macroscopic mathematical models are formulated for saturated, single phase flow, as well as for unsaturated and multiphase flow, and for the transport of single and multiple chemical species. Numerical models are presented and computer codes are reviewed, as tools for solving the models. The problem of seawater intrusion into coastal aquifers is examined and modeled. The issues of uncertainty in model input data and output are addressed. The book concludes with a chapter on the management of groundwater resources. Although one of the main objectives of this book is to construct mathematical models, the amount of mathematics required is kept minimal.
Book Synopsis Modeling and Stochastic Analysis of Contaminant Transport in Soils and Aquifers by : Mohamed Mahdi Hantush
Download or read book Modeling and Stochastic Analysis of Contaminant Transport in Soils and Aquifers written by Mohamed Mahdi Hantush and published by . This book was released on 1996 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessment of Non-Point Source Pollution in the Vadose Zone by : Dennis L. Corwin
Download or read book Assessment of Non-Point Source Pollution in the Vadose Zone written by Dennis L. Corwin and published by American Geophysical Union. This book was released on 1999-01-26 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 108. Non-point source (NPS) pollution in the vadose zone (simply defined as the layer of soil extending from the soil surface to the groundwater table) is a global environmental problem. Characteristically, NPS pollutants are widespread and occasionally ubiquitous in extent, thus making remediation efforts difficult and complex; have the potential for maintaining a relatively long active presence in the global ecosystem; and may result in long?]term, chronic health effects in humans and other life forms. Similar to other global environmental issues, the knowledge and information required to address the problem of NPS pollutants in the vadose zone cross several technological and subdisciplinary lines: spatial statistics, geographic information systems (GIS), hydrology, soil science, and remote sensing. Cooperation between disciplines and scientific societies is essential to address the problem. Evidence of such cooperation was the jointly sponsored American Geophysical Union Chapman/Soil Science Society of America (SSSA) Outreach Conference that occurred in October 1997, entitled “Applications of GIS, Remote Sensing, Geostatistics, and Solute Transport Modeling to the Assessment of Non-Point Source Pollution in the Vadose Zone.” The objective of the conference and this book, which was developed from the conference, was to explore current multidisciplinary research for assessing NPS pollution in soil and groundwater resources.
Book Synopsis Stochastic Analysis of Contaminant Transport by :
Download or read book Stochastic Analysis of Contaminant Transport written by and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reliability algorithm is used to develop probabilistic (stochastic) models or contaminant transport in porous media. The models are based on advective-dispersive transport equations, and utilize the reliability algorithm with existing one- and two-dimensional analytical and numerical solutions. Uncertain variables in the models include: groundwater flow velocity (or permeability in the numerical model), dispersivity, diffusion coefficient, bulk density, porosity, and solute distribution coefficient. Each uncertain variable is assigned a mean, covariance, and marginal distribution. The models yield an estimate of the probability that the contaminant concentration will equal or exceed a target concentration at a selected location and time. The models also yield probabilistic sensitivity measures which identify those uncertain variables with most influence on the probabilistic outcome. The objective of this study is to examine the basic behavior and develop general conclusions regarding transport under certain conditions as modeled using a reliability approach.
Book Synopsis DEVELOPMENT OF A ONE-DIMENSIONAL CONTAMINANT MODEL FOR STREAMS AND RIVERS. by :
Download or read book DEVELOPMENT OF A ONE-DIMENSIONAL CONTAMINANT MODEL FOR STREAMS AND RIVERS. written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Contaminant Model for Streams (CMS) was developed for use in studies where both data and resources for model application are limited. CMS can be quickly and easily applied, yet it is still versatile enough to be used for a variety of conditions ranging from short term spill modeling to multi-year simulations of contaminant fate in stream water and bottom sediments. The model can be applied for both organic and inorganic contaminants. Suspended solids can be transported or a steady-state concentration may be input. Steady-state, uniform hydraulic conditions are assumed within the modeled reach, which greatly reduces model complexity. A model application may consist of one or more reaches connected in series or in a branched network. Possible sediment model configurations include: 1) water column only, 2) water column and mixed sediment layer, and 3) water column, mixed sediment layer, and deep sediment layer.
