Download or read book Techniques for Contaminant Transport Model Validation written by Nadarajah, P. (Prebaharan) and published by London : Geotechnical Research Centre, University of Western Ontario. This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contaminant Transport Model Validation written by R. R. Lee and published by . This book was released on 1988 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation Testing a Contaminant Transport and Natural Attentuation Simulation Model Using Field Data written by Steven J. Flier and published by . This book was released on 1995 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contaminant Transport Model Validation written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the complex geologic setting on the Oak Ridge Reservation, hydraulic conductivity is anisotropic and flow is strongly influenced by an extensive and largely discontinuous fracture network. Difficulties in describing and modeling the aquifer system prompted a study to obtain aquifer property data to be used in a groundwater flow model validation experiment. Characterization studies included the performance of an extensive suite of aquifer test within a 600-square-meter area to obtain aquifer property values to describe the flow field in detail. Following aquifer test, a groundwater tracer test was performed under ambient conditions to verify the aquifer analysis. Tracer migration data in the near-field were used in model calibration to predict tracer arrival time and concentration in the far-field. Despite the extensive aquifer testing, initial modeling inaccurately predicted tracer migration direction. Initial tracer migration rates were consistent with those predicted by the model; however, changing environmental conditions resulted in an unanticipated decay in tracer movement. Evaluation of the predictive accuracy of groundwater flow and contaminant transport models on the Oak Ridge Reservation depends on defining the resolution required, followed by field testing and model grid definition at compatible scales. The use of tracer tests, both as a characterization method and to verify model results, provides the highest level of resolution of groundwater flow characteristics. 3 refs., 4 figs.

Download or read book Seminar on Transport and Fate of Contaminants in the Subsurface written by and published by . This book was released on 1987 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation Testing a Contaminant Transport and Natural Attenuation Simulation Model Using Field Data written by and published by . This book was released on 1995 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research extends the work begun by Enyeart (1994) which evaluated the process of intrinsic bioremediation, and which developed a model for predicting the velocity of an aerobic degradation front, as it traverses the length of a JP-4 contaminant plume. It is assumed this aerobic front will traverse the contaminant plume as dissolved oxygen is carried by the ground water through the sorption-retarded contaminant. The ultimate purpose of Enyeart's model is to use it to develop field guidance for assessing the feasibility of intrinsic bioremediation to restore petroleum-contaminated soils. After simulating intrinsic bioremediation many times with a spreadsheet model, results were used to develop a linear regression model to predict the velocity of the aerobic front, and thus the time it takes to propagate through from the rear to the front of the simulated plume. The time needed for the aerobic front to travel from the rear to the front of the plume is taken as the time to contaminant remediation. In the present work, Enyeart' 5 model was validity tested by comparing its output prediction with field measured values. A methodology was developed to compare the model output with field measured data. The results were analyzed, and the results of this first stage of validity testing show a reasonable basis for accepting the model. Further validity testing of the model will be required to assess its performance across a wide range of field conditions. It is hoped that contaminated-site managers will one day use the validated regression model to predict the time required to affect the complete remediation of a contaminated site via intrinsic bioremediation. (AN).

Download or read book Water Resources Assessment Modelling and Management written by C. P. Kumar and published by C. P. Kumar. This book was released on 2023-03-30 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water is one of the most vital resources on Earth and plays a crucial role in sustaining life. With the rapid increase in population and urbanization, the demand for water has been increasing exponentially, leading to an immense pressure on the existing water resources. In this context, the assessment, modelling, and management of water resources have become crucial to ensure sustainable development. This book, "Water Resources Assessment, Modelling and Management," is a collection of 101 articles that delve into various topics related to water resources. It covers various aspects related to surface water, groundwater, surface water modelling, groundwater modelling, management of water resources, challenges and strategies, advanced techniques in water resources, thrust areas. The book provides a special emphasis on water resources issues and management in India, which is crucial due to the significant water-related challenges faced by the country. The articles in the book offer a broad overview of the latest techniques, tools, and strategies used in the assessment, modelling, and management of water resources. Each article is concise, with a length of around three pages, and provides a brief yet informative summary of the respective topic. The aim of the book is to provide readers with a quick and accessible overview of each topic, without delving too deeply into technical details or using equations. To keep the content straightforward and easy to understand, the articles do not contain equations. However, readers who wish to explore a topic in more depth are encouraged to consult other relevant books and resources, where they can find more comprehensive information and mathematical formulations. The book aims to be a valuable resource for water resources professionals, researchers, and students who are interested in understanding the challenges associated with water resources and the strategies for their management. It covers a wide range of topics, including the latest techniques and tools used in water resources management, and the impact of climate change on water resources. Overall, the book provides a comprehensive overview of the current state of knowledge and practice in the assessment, modelling, and management of water resources. The book is expected to serve as a useful reference for anyone interested in this important and timely topic.

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.

Download or read book Applied Contaminant Transport Modeling written by Chunmiao Zheng and published by Wiley. This book was released on 1995-08-07 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Contaminant Transport Modeling Theory and Practice Chunmiao Zheng and Gordon D. Bennett The design of remedial systems for groundwater contamination requires a thorough understanding of how various interacting processes — advection, dispersion, and chemical reactions — influence the movement and fate of contaminants. Solute transport simulation provides an ideal vehicle to synthesize these controlling processes, evaluate their interactions, and test the effectiveness of remedial measures. Applied Contaminant Transport Modeling is the first complete resource designed to provide clear coverage of the basic principles of solute transport simulation — including the theory behind the most common numerical techniques for solving transport equations, and step-by-step guidance on the development and use of field-scale models. Written by two experts with extensive practical experience in the field, Applied Contaminant Transport Modeling clearly explains: Factors controlling the transport and fate of solutes in the subsurface —g including advective and dispersive transport and chemical reaction — and the equations governing these processes Development of mathematical models of solute transport regimes and representative analytical solutions to the transport equation Particle tracking as a practical tool for solving many types of field problems Development of Eulerian-Lagrangian methods for solving advection-dispersion-reaction equations Step-by-step development and application of solute transport models — emphasizing problem formulation, model setup, parameter selection, calibration, and sensitivity analysis Sources of uncertainty in transport simulation, and methods of evaluating and managing uncertainty Applied Contaminant Transport Modeling presents detailed case histories illustrating how hydrologists, geologists, chemists, and environmental engineers apply transport models in real-life situations, including landfills, hazardous waste sites, and contaminated aquifers. An optional diskette designed to accompany the text provides software to help the reader explore the concepts and techniques presented in the text and gain hands-on experience in transport simulation. Driven by growing concern over groundwater quality and the rapid dissemination of computer technology, solute transport simulation has become an essential means of evaluating and solving groundwater contamination and remediation problems. Applied Contaminant Transport Modeling provides you with the tools to master this significant field of study.

Download or read book Nist Technical Note 1703 written by U.s. Department of Commerce and published by CreateSpace. This book was released on 2014-03-04 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whole-building airflow and contaminant transport modeling has a potentially important role in the development of contaminant sampling strategies in response to the airborne release of chemical or biological agents. The effectiveness of these strategies relies on the ability of the selected sampling locations to adequately characterize the levels of contamination throughout an exposed facility to a desired level of confidence in the sampled results. The Department of Homeland Security has sponsored a series of multi-agency exercises, during which contamination experiments were performed to gauge the confidence that could be obtained by various sampling strategies as well as the effectiveness of various sampling methods in a realworld setting. These experiments are very resource intensive and time-consuming, limiting the number of experiments that can be reasonably performed. Building simulation can be used to perform virtual experiments that would allow more tests to be performed under a much larger set of building operational and environmental configurations. However, in order for the simulations to be useful, the building models need to provide realistic results with a high level of confidence. The purpose of this report is to describe a simulation validation effort based on measurements of contaminant levels performed during the aforementioned exercises.

Download or read book Development of a Distributed Source Contaminant Transport Model for ARAMS written by Billy E. Johnson and published by . This book was released on 2005 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methods and Techniques for Preventing and Mitigating Water Hazards in Mines written by Shuning Dong and published by Springer Nature. This book was released on 2021-01-23 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the advances in mine hydrogeology in terms of the development of new technologies and sustainable mining to prevent water inrush disasters during coal-mine construction and production in China. It presents holistic topics that balance safe coal mining and the minimization of impacts on the environment and human beings. Systematically describing the methods and techniques used in China’s coal mines to predict, prevent and mitigate water inrushes, it includes nine case studies to illustrate the practical engineering solutions using state-of-art methods and technologies under various conditions. It also discusses how the approaches could help solve the world’s water problems, not only in mining, but also in tunneling, disposing of nuclear waste, storing natural gas, and sequestering CO2, as well as their impact on mining industries and related fields around the world. The book intended for students, researchers and practitioners working in the mining industries.

Download or read book Isotope Production And Applications In The 21st Century Proceedings Of The 3rd International Conference On Isotopes written by Nigel R Stevenson and published by World Scientific. This book was released on 2000-10-09 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Third International Conference on Isotopes focused on the theme of “Isotope Production and Applications in the 21st Century” and included presentations by several eminent experts in this field. The three central subjects — Isotopes in Medicine, Industry and the Environment — were supplemented by presentations on the latest developments in isotope production and synthesis, research into radiopharmaceuticals, applications in agriculture, analytical applications, radiocarbon dating, AMS and PET. Various views on the future directions for producers and users of isotopes were considered at this multi-disciplinary meeting.

Download or read book Contamination of Groundwaters written by Domy C. Adriano and published by CRC Press. This book was released on 2020-11-25 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: International experts have contributed key chapters to this major work on groundwater contamination. Section 1: Methodology and Modeling deals with both organic and inorganic contaminants, including those from agricultural operations. Section 2: Case Studies presents contamination scenarios with both inorganic and organic chemicals including agriculturally-related constituents, such as the nitrates. This important new publication is a welcome addition to the literature and will enhance recent information on methodology, modeling and real-world situations. It is of interest to scientists and planners in local and national government; environmental chemists, geochemists, geologists, and health and safety officers; river authorities; hydrologists; and the mining and land reclamation industries.

Download or read book The Use of Streamline Based Methods to Model Contaminant Transport in the Subsurface written by R. Rubin and published by . This book was released on 1998 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Estimates of future environmental and health risk, assessment of environmental cleanup cost, and liability decisions often depend on numerical modeling of the subsurface movement of ground water and of ground-water contamination. There are two main approaches, grid point methods (for example, finite element analyses) and flow methods (for example, particle tracking and streamline calculation). Each approach has its strengths and weaknesses; for example, grid point methods are better at calculating dispersion and flow methods are better at calculating the advective movement of sharp fronts of contaminant concentration. A major drawback of grid point methods is that greater accuracy requires both smaller grid spacing and shorter time steps, resulting in unsupportable computational burdens. Streamline calculations are much faster but have been restricted to single-phase systems. Recent advances in numerical technique, motivated by petroleum recovery problems, have expanded the application of streamline methods to complex, nonlinear multi-phase flow and allow very rapid calculation and numerical solution. This paper outlines the approach and considers how these same techniques could be applied to environmental contaminant transport problems and concludes that useful potential applications exist.

Download or read book Model Development and Validation for Particle Release Experiments in a Two Story Office Building written by Nist and published by CreateSpace. This book was released on 2014-03-07 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whole-building airflow and contaminant transport modeling has a potentially important role in the development of contaminant sampling strategies in response to the airborne release of chemical or biological agents . The effectiveness of these strategies relies on the ability of the selected sampling locations to adequately characterize the levels of contamination throughout an exposed facility to a desired level of confidence in the sampled results. The Department of Homeland Security has sponsored a series of multi-agency exercises, during which contamination experiments were performed to gauge the confidence that could be obtained by various sampling strategies as well as the effectiveness of various sampling methods in a real-world setting. These experiments are very resource intensive and time-consuming, limiting the number of experiments that can be reasonably performed. Building simulation can be used to perform virtual experiments that would allow more tests to be performed under a much larger set of building operational and environmental configurations. However, in order for the simulations to be useful, the building models need to provide realistic results with a high level of confidence. The purpose of this report is to describe a simulation validation effort based on measurements of contaminant levels performed during the aforementioned exercises.

Download or read book A Review of the State of the Art written by and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: