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Coupling Between Flow And Precipitation In Heterogeneous Subsurface Environmentsand Effects On Contaminant Fate And Transport Project No 99272
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Book Synopsis Coupling Between Flow and Precipitation In Heterogeneous Subsurface Environmentsand Effects on Contaminant Fate and Transport (Project No. 99272). by : R. W. Smith
Download or read book Coupling Between Flow and Precipitation In Heterogeneous Subsurface Environmentsand Effects on Contaminant Fate and Transport (Project No. 99272). written by R. W. Smith and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project is aimed at understanding how contaminant transport in heterogeneous porous media is impacted by precipitation and dissolution events through chemical interactions with precipitates and as a consequence of coupling between precipitation and flow. We hypothesize that precipitation/coprecipitation, encapsulation, isolation from flow and alteration of reactive surfaces will contribute to altering contaminant mobility during precipitation events, and that predicting the release of contaminants during precipitate dissolution requires an understanding of how precipitates are distributed and how contaminants are released from the different compartments over time. Using calcium carbonate as a model system, physical experiments and modeling at the pore-scale and continuum-scale will be used to improve the conceptual approach to predicting the impact of flow-precipitation coupling on solute migration. Column and 2-dimensional intermediate-scale experiments with constructed physical and chemical heterogeneities will be used to investigate the movement of fluids and reactive solutes during different types of mixing events that lead to calcium carbonate supersaturation and precipitation. Smoothed particle hydrodynamic modeling will be used to simulate pore-scale mixing and precipitation in heterogeneous porous media and estimate continuum-scale parameters. Continuum-scale modeling will be used to test conceptual models and associated effective parameters that simulate the macroscopic behavior of the experimental domains.
Book Synopsis Coupling Between Flow and Precipitation In Heterogeneous Subsurface Environments and Effects on Contaminant Fate and Transport (Project Numbers 99272). by :
Download or read book Coupling Between Flow and Precipitation In Heterogeneous Subsurface Environments and Effects on Contaminant Fate and Transport (Project Numbers 99272). written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project is aimed at understanding how contaminant transport in heterogeneous porous media is impacted by precipitation and dissolution events through chemical interactions with precipitates and as a consequence of coupling between precipitation and flow. We hypothesize that precipitation/coprecipitation, encapsulation, isolation from flow and alteration of reactive surfaces will contribute to altering contaminant mobility during precipitation events, and that predicting the release of contaminants during precipitate dissolution requires an understanding of how precipitates are distributed and how contaminants are released from the different compartments over time. Using calcium carbonate as a model system, physical experiments and modeling at the pore-scale and continuum-scale will be used to improve the conceptual approach to predicting the impact of flow-precipitation coupling on solute migration. Column and 2-dimensional intermediate-scale experiments with constructed physical and chemical heterogeneities will be used to investigate the movement of fluids and reactive solutes during different types of mixing events that lead to calcium carbonate supersaturation and precipitation. Smoothed particle hydrodynamic modeling will be used to simulate pore-scale mixing and precipitation in heterogeneous porous media and estimate continuum-scale parameters. Continuum-scale modeling will be used to test conceptual models and associated effective parameters that simulate the macroscopic behavior of the experimental domains.
Book Synopsis Fate and Transport of Subsurface Pollutants by : Pankaj Kumar Gupta
Download or read book Fate and Transport of Subsurface Pollutants written by Pankaj Kumar Gupta and published by Springer Nature. This book was released on 2020-10-20 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers detailed information on the behaviour of various water pollutants, and on the principles and concepts of groundwater flow and transport. It will help readers to understand and execute the planning, supervision, and review of solute transport and groundwater modeling projects. The book also discusses the role and fate of elements that have been identified as major contaminants in surface and subsurface waters, and their adverse effects on ecology and human health. The book explores this theme throughout four sections – a. Understanding Soil-Water Systems, b. Fate and Transport of Pollutants, c. Physico-Chemical Treatment of Wastewater and d. Microbial Techniques Used to Decontaminate Soil-Water Systems. Introducing readers to a range of recent advances concerning the fundamentals of subsurface water treatment, it offers a valuable guide for teachers, researchers, policymakers, and undergraduate and graduate students of hydrology, environmental microbiology, biotechnology and the environmental sciences. It also provides field engineers and industrial practitioners with essential support in the effective remediation and management of polluted sites.
Book Synopsis Hydrologic Effects on Subsurface Fates and Transport of Contaminants by :
Download or read book Hydrologic Effects on Subsurface Fates and Transport of Contaminants written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Concerns over contamination of ground water (GW) and its subsequent effect on surface water quality underscore the need for an improved understanding of the fate and transport of the contaminants in the subsurface. Among the contaminants that are harmful to humans and the environment are nutrient pollutants [e.g., nitrogen (N) and phosphorus (P)] and microbes. The general goal of this research was to evaluate the subsurface fates and transport of contaminants in a vadose zone-GW continuum under various simulated hydrologic conditions through a series of laboratory-scale studies. The first study, which aimed to visually evaluate the effects of GW velocity and water table (WT) fluctuation on the fate and extent of horizontal transport of solutes and microbes in the capillary fringe (CF) and GW, was conducted in a sand-packed flow cell. Subsurface transport of surface-applied solutes and microbes tended to be isolated in the CF at a higher pore-water velocity. A rise in WT resulting from surface recharge of contaminated water occurred without the contaminants reaching the GW. Subsequent drainage did not effectively leach contaminants that were initially in the CF into the GW. The second study assessed the effect of pore-water velocity on the development of reduced conditions in a vadose zone-GW continuum. Reduction potential (Eh) was monitored at various locations in flow cells packed with Ponzer (Terric Haplosaprists), Lynchburg (Aeric Paleaquult), and Leon (Aeric Alaquod) soil materials that were subjected to different lateral pore-water velocities. Regardless of organic carbon (OC) content of the soil materials (12.4 to 195 g kg-1), locations close to the WT became reduced within 14 days. In contrast, the upper portions of the CF remained oxic. Increasing the pore-water velocity also slowed the development of reducing conditions especially in soils with low OC content. The third study was conducted to evaluate the effect of pore-water velocity on the fate and transp.
Book Synopsis Flow and Transport in Porous Formations by : Gedeon Dagan
Download or read book Flow and Transport in Porous Formations written by Gedeon Dagan and published by Springer. This book was released on 1989-08-21 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the mid-seventies, a new area of research has emerged in subsurface hydrology, namely sto chastic modeling of flow and transport. This development has been motivated by the recognition of the ubiquitous presence of heterogeneities in natural formations and of their effect upon transport and flow, on the one hand, and by the vast expansion of computational capability provided by elec tronic machines, on the other. Apart from this, one of the areas in which spatial variability of for mation properties plays a cardinal role is of contaminant transport, a subject of growing interest and concern. I have been quite fortunate to be engaged in research in this area from its inception and to wit ness the rapid growth of the community and of the literature on spatial variability and its impact upon subsurface hydrology. In view of this increasing interest, I decided a few years ago that it would be useful to present the subject in a systematic and comprehensive manner in order to help those who wish to engage themselves in research or application of this new field. I viewed as my primary task to analyze the large scale heterogeneity of aquifers and its effect, presuming that the reader already possesses a background in traditional hydrology. This is achieved in Parts 3, 4 and 5 of the text which incorporate the pertinent material.
Book Synopsis Flow and Transport in Subsurface Environment by : Natarajan Narayanan
Download or read book Flow and Transport in Subsurface Environment written by Natarajan Narayanan and published by Springer. This book was released on 2019-02-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of contributions from experts working on flow and transport in porous media around the globe. The book includes chapters authored by engineers, scientists, and mathematicians on single and multiphase flow and transport in homogeneous as well as heterogeneous porous media. Addressing various experimental, analytical, and modeling aspects of transport in sub-surface domains, the book offers a valuable resource for graduate students, researchers, and professionals alike.
Book Synopsis Coupled Processes of Fluid Flow, Solute Transport, and Geochemical Reactions in Reactive Barriers by :
Download or read book Coupled Processes of Fluid Flow, Solute Transport, and Geochemical Reactions in Reactive Barriers written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complex pattern of coupling between fluid flow and mass transport develops when heterogeneous reactions occur. For instance, dissolution and precipitation reactions can change a porous medium's physical properties, such as pore geometry and thus permeability. These changes influence fluid flow, which in turn impacts the composition of dissolved constituents and the solid phases, and the rate and direction of advective transport. Two-dimensional modeling studies using TOUGHREACT were conducted to investigate the coupling between flow and transport developed as a consequence of differences in density, dissolution precipitation, and medium heterogeneity. The model includes equilibrium reactions for aqueous species, kinetic reactions between the solid phases and aqueous constituents, and full coupling of porosity and permeability changes resulting from precipitation and dissolution reactions in porous media. In addition, a new permeability relationship is implemented in TOUGHREACT to examine the effects of geochemical reactions and density difference on plume migration in porous media. Generally, the evolutions in the concentrations of the aqueous phase are intimately related to the reaction-front dynamics. Plugging of the medium contributed to significant transients in patterns of flow and mass transport.
Book Synopsis Frelsens Hærs Forsagelses-Sange i Ugen fra 1.-7. November 1896 by :
Download or read book Frelsens Hærs Forsagelses-Sange i Ugen fra 1.-7. November 1896 written by and published by . This book was released on 1896 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrologic Effects on Subsurface Fates and Transport of Contaminants by : Sergio Manacpo Abit
Download or read book Hydrologic Effects on Subsurface Fates and Transport of Contaminants written by Sergio Manacpo Abit and published by . This book was released on 2009 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: vadose zone, capillary fringe, nitrate, phosphorsus dissolution, nitrate reduction, microbial transport, solute transport.
Book Synopsis Physical and Chemical Controls on Subsurface Contaminant Fate and Transport by : Kalle He Jahn
Download or read book Physical and Chemical Controls on Subsurface Contaminant Fate and Transport written by Kalle He Jahn and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: When anthropogenic contaminants are released as solids and liquids into the natural environment, subsurface soils and bedrock are the primary control on their long-term fate. Accounting for complexity in the subsurface is the central challenge in solving field-scale contaminant transport problems. Yet, the subsurface is difficult to observe at the field scale. Even though field data offer an incomplete glimpse into the complexity of natural systems, they can significantly benefit subsurface contaminant research. This dissertation investigates subsurface contaminant transport behavior by making quantitative observations of soil and bedrock properties and subsurface water and contaminant distributions, developing conceptual models of subsurface processes based on those field data, and subsequently testing those conceptual models using analytical and numerical modeling. The subsurface fate and transport behavior of two sets of contaminants are investigated: nitrate and poly- and perfluoroalkyl substances, both of which have significant ecological and societal consequences. A wide range of field methods are used to measure subsurface properties and processes, including soil and bedrock hydraulic properties, water table elevations, water contents, soil infiltration rates, water chemistry. These quantitative data are interpreted alongside analytical and numerical models of water flow and solute transport to investigate the processes behind observed contaminant distributions. This dissertation highlights the importance of direct measurements of subsurface properties for accurately assessing contamination of water resources, yielding new insights into the fundamental processes governing the subsurface transport of water and solutes, and generating the quantitative data needed to address the ever-evolving threats to human water security.
