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Modeling Reactive Transport Of Strontium 90 In Heterogeneous Variably Saturated Subsurface
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Book Synopsis Alkaline Earth Metals—Advances in Research and Application: 2012 Edition by :
Download or read book Alkaline Earth Metals—Advances in Research and Application: 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alkaline Earth Metals—Advances in Research and Application: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Alkaline Earth Metals. The editors have built Alkaline Earth Metals—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Alkaline Earth Metals in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Alkaline Earth Metals—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis Rainfall Infiltration Modeling by : Renato Morbidelli
Download or read book Rainfall Infiltration Modeling written by Renato Morbidelli and published by MDPI. This book was released on 2020-12-02 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rainfall infiltration is an important component of the hydrologic cycle and plays a crucial role in the formation of surface runoff, providing subsurface water that governs the water supply for agriculture, the transport of pollutants through the vadose zone, and the recharge of aquifers. The spatiotemporal evolution of the infiltration rate under natural conditions cannot currently be deduced by direct measurements at any scale of interest. Therefore, the use of infiltration modeling is of fundamental importance in applied hydrology and allows this process to be described through measurable quantities. In spite of the continuous development of infiltration modeling in recent decades, the estimation of infiltration at different spatial scales, i.e., from the local to watershed scales, remains a complex problem because of the natural spatial variability of both soil hydraulic characteristics and rainfall. For many years, research activity has been limited to the development of local or point infiltration models for vertically homogeneous soils with flat surfaces. Recent scientific literature has extended infiltration modeling to many other involved elements whose representation, however, still represents an open problem. In this context, this volume attempts to make a contribution to the modeling of point infiltration into vertically non-uniform soils or soils modified by human activities, infiltration over horizontal heterogeneous areas, infiltration into soil surfaces with significant slopes, interaction between the infiltration process and the groundwater system, and infiltration due to irrigation and the surface water–groundwater dynamics.
Book Synopsis Project Work Plan by : Jim E. Szecsody
Download or read book Project Work Plan written by Jim E. Szecsody and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We propose to develop an infiltration strategy that defines the precipitation rate of an apatite-forming solution and Sr-90 sequestration processes under variably saturated (low water content) conditions. We will develop this understanding through small-scale column studies, intermediate-scale two-dimensional (2-D) experiments, and numerical modeling to quantify individual and coupled processes associated with apatite formation and Sr-90 transport during and after infiltration of the Ca-citrate-PO4 solution. Development of capabilities to simulate these coupled biogeochemical processes during both injection and infiltration will be used to determine the most cost-effective means to emplace an in situ apatite barrier with a longevity of 300 years to permanently sequester Sr-90 until it decays. Biogeochemical processes that will be investigated are citrate biodegradation and apatite precipitation rates at varying water contents as a function of water content. Coupled processes that will be investigated include the influence of apatite precipitation (which occupies pore space) on the hydraulic and transport properties of the porous media during infiltration.
Book Synopsis Reactive Transport in the Subsurface by : Marco Dentz
Download or read book Reactive Transport in the Subsurface written by Marco Dentz and published by . This book was released on 2011 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spring Meeting by : American Geophysical Union. Meeting
Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1996 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiscale High-order Methods for Reactive Transport in Porous Media by : Ricardo Hüntemann Deucher
Download or read book Multiscale High-order Methods for Reactive Transport in Porous Media written by Ricardo Hüntemann Deucher and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subsurface reactive processes play an important role in addressing energy and climate challenges of the 21st century. Example applications are CO2 sequestration, enhanced oil recovery, and contaminant transport. Understanding the complex nonlinear interplay of flow, transport, and reactions at the multiple length scales that characterize subsurface systems is one of the main challenges for advancing the analysis of reactive transport. To address these challenges, this dissertation presents three main contributions towards accurate and efficient simulations of subsurface reactive transport. Chapter 2 develops a multiscale scheme for the sequential formulation of reactive transport involving two fluid phases. Instead of solving the transport problem on the global fine-scale model, the domain is decomposed into coarse gridblocks that are aggregates of fine gridblocks. The transport problem is defined and solved on each of the coarse blocks, and a prolongation operator that allows for accurate reconstruction of the fine-scale solution is defined. The prolongation operator is independent of the details of the chemical reactions involving the particular component being transported and does not interfere with the chemical module, providing flexibility of implementation and applicability to a wide range of conditions. The more confined concentration gradients obtained with high-order approximation of the numerical fluxes lead to a better performance of the scheme when compared to low-order fluxes. Test cases include applications to chains of homogeneous decay reactions, heterogeneous reactions with changes in rock properties, coupling with a chemical solver to model the calcium carbonate reactive system, variable time step sizes, and changes in operational conditions. A high-resolution adaptive implicit method for reactive transport is proposed in Chapter 3. The adaptive implicit method (AIM) reduces the computational cost related to simulations of field scale displacements in porous media. Standard AIM uses single-point upwind and a mixed implicit/explicit time discretization that overcomes the time step size limitations of purely explicit approaches. To reduce numerical diffusion and improve the accuracy of AIM, we introduce a scheme that in addition to blending implicit and explicit time discretizations, deliberately blends single-point upwind and a high-order flux-limited total variation diminishing approximation of the numerical fluxes. The proposed scheme does not interfere with the discretization of the implicit terms and the structure of the matrices that need to be solved is the same of standard AIM, making the scheme easy to apply in existing simulators. Numerical results indicate significant gains in accuracy at the additional expense of slightly more involved flux computations in the explicit regions, that represent a small fraction of the total CPU cost. In Chapter 4, a new upscaling procedure that provides 1D representations of 2D mixing-limited reactive transport systems is developed and applied. A key complication with upscaled models in this setting is that the procedure must differentiate between interface spreading, driven by the spatially variable velocity field, and mixing, through which components contact one another and react. Our model captures the enhanced mixing caused by spreading through use of a time-dependent effective dispersion term. The early-time behavior of this dispersion is driven by flow kinematics, while at late times it reaches a Taylor-dispersion-like limit. The early-time behavior is modeled using a very fast (purely advective) particle tracking procedure. The only unknown parameter in the model is the late-time asymptotic effective dispersion. This quantity is estimated using a fit involving a dimensionless grouping of system variables and a few reference results, or by calibrating with the corresponding conservative (non-reacting) case. Numerical results for bimolecular reaction systems are generated using a pseudo-spectral approach capable of resolving fronts at high Peclet numbers. Results are presented for three different types of 2D velocity fields over a wide range of parameters. The upscaled model is shown to provide highly accurate results for the conversion factor, along with reasonable approximations of the spatial distribution of reaction occurrence. The model is also shown to be valid to upscale mixing in non-reacting systems.
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 Reactive Transport in Natural Porous Media by : Babak Shafei
Download or read book Reactive Transport in Natural Porous Media written by Babak Shafei and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive Transport Models (RTMs) provide quantitative tools to analyze the interaction between transport and biogeochemical processes in subsurface environments such as aquatic sediments and groundwater flow. A tremendous amount of research has shown the role and impact of scaling behavior of the reactive systems which stems from geologic heterogeneity. Depending on the kinetics of the reactions, different types of formulations have been proposed to describe reactions in RTMs. We introduce a novel quantitative criteria on the range of validity of local equilibrium assumption (LEA) in aquatic sediments with irreversible heterogeneous sorption reactions. Then we present a one-dimensional (1-D) early diagenetic module, MATSEDLAB, developed in MATLAB. The module provides templates for representing the reaction network, boundary conditions and transport regime, which the user can modify to fit the particular early diagenetic model configuration of interest. We describe the theoretical background of the model and introduce the MATLAB pdepe solver, followed by calibration and validation of the model by a number of theoretical and empirical applications. Finally, we introduce a new pore-scale model using lattice Boltzmann (LB) approach. It uses an iterative scheme for the chemical transport-reaction part and recent advances in the development of optimal advection-diffusion solvers within the lattice Boltzmann method framework. We present results for the dissolution and precipitation of a porous medium under different dynamical conditions, varying reaction rates and the ratio of advective to diffusive transport (Pe, Peclet number) for linear reactions. The final set of calculations considers sorption reactions on a heterogeneous porous medium. We use our model to investigate the effect of heterogeneity on the pore-scale distribution of sorption sites and the competition between three different sorption reactions.
Book Synopsis Reactive Transport in Porous Media by : Peter C. Lichtner
Download or read book Reactive Transport in Porous Media written by Peter C. Lichtner and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 34 of Reviews in Mineralogy focuses on methods to describe the extent and consequences of reactive flow and transport in natural subsurface systems. Since the field of reactive transport within the Earth Sciences is a highly multidisciplinary area of research, including geochemistry, geology, physics, chemistry, hydrology, and engineering, this book is an attempt to some extent bridge the gap between these different disciplines. This volume contains the contributions presented at a short course held in Golden, Colorado, October 25-27, 1996 in conjunction with the Mineralogical Society of America's (MSA) Annual Meeting with the Geological Society of America in Denver, Colorado.
Book Synopsis Advanced Excel for Scientific Data Analysis by : Robert De Levie
Download or read book Advanced Excel for Scientific Data Analysis written by Robert De Levie and published by Oxford University Press, USA. This book was released on 2004 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide to Excel focuses on three areas--least squares, Fourier transformation, and digital simulation. It illustrates the techniques with detailed examples, many drawn from the scientific literature. It also includes and describes a number of sample macros and functions to facilitate common data analysis tasks. De Levie is affiliated with Bowdoin College. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).
Book Synopsis Rock Fractures and Fluid Flow by : National Research Council
Download or read book Rock Fractures and Fluid Flow written by National Research Council and published by National Academies Press. This book was released on 1996-08-27 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific understanding of fluid flow in rock fracturesâ€"a process underlying contemporary earth science problems from the search for petroleum to the controversy over nuclear waste storageâ€"has grown significantly in the past 20 years. This volume presents a comprehensive report on the state of the field, with an interdisciplinary viewpoint, case studies of fracture sites, illustrations, conclusions, and research recommendations. The book addresses these questions: How can fractures that are significant hydraulic conductors be identified, located, and characterized? How do flow and transport occur in fracture systems? How can changes in fracture systems be predicted and controlled? Among other topics, the committee provides a geomechanical understanding of fracture formation, reviews methods for detecting subsurface fractures, and looks at the use of hydraulic and tracer tests to investigate fluid flow. The volume examines the state of conceptual and mathematical modeling, and it provides a useful framework for understanding the complexity of fracture changes that occur during fluid pumping and other engineering practices. With a practical and multidisciplinary outlook, this volume will be welcomed by geologists, petroleum geologists, geoengineers, geophysicists, hydrologists, researchers, educators and students in these fields, and public officials involved in geological projects.
Book Synopsis Groundwater Reactive Transport Models by : Gour-Tsyh (George) Yeh
Download or read book Groundwater Reactive Transport Models written by Gour-Tsyh (George) Yeh and published by . This book was released on 2012-03-15 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ground water reactive transport models are useful to assess and quantify contaminant precipitation, absorption and migration in subsurface media. Many ground water reactive transport models available today are characterized by varying complexities, strengths, and weaknesses. Selecting accurate, efficient models can be a challenging task. This book addresses the needs, issues and challenges relevant to selecting a ground water reactive transport model to evaluate natural attenuation and alternative remediation schemes. It should serve as a handy guide for water resource managers seeking to achieve economically feasible results.
Book Synopsis Environmental Applications of Geochemical Modeling by : Chen Zhu
Download or read book Environmental Applications of Geochemical Modeling written by Chen Zhu and published by Cambridge University Press. This book was released on 2002-05-13 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: An application of geochemical modeling to environmental problems, illustrated with case studies of real-world environmental investigations.
Book Synopsis Unsaturated-zone Modeling by : R.A. Feddes
Download or read book Unsaturated-zone Modeling written by R.A. Feddes and published by Springer Science & Business Media. This book was released on 2004-10-11 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mankind has manipulated the quantity and quality of soil water for millennia. Food production was massively increased through fertilization, irrigation and drainage. But malpractice also caused degradation of immense areas of once fertile land, rendering it totally unproductive for many generations. In populated areas, the pollutant load ever more often exceeds the soil’s capacity for buffering and retention, and large volumes of potable groundwater have been polluted or are threatened to be polluted in the foreseeable future. In the past decades, the role of soil water in climate patterns has been recognized but not yet fully understood. The soil-science community responded to this diversity of issues by developing numerical models to simulate the behavior of water and solutes in soils. These models helped improve our understanding of unsaturated-zone processes and develop sustainable land-management practices. Aimed at professional soil scientists, soil-water modelers, irrigation engineers etc., this book discusses our progress in soil-water modeling. Top scientists present case studies, overviews and analyses of strengths, weaknesses, opportunities and threats related to soil-water modeling. The contributions cover a wide range of spatial scales, and discuss fundamental aspects of unsaturated-zone modeling as well as issues related to the application of models to real-world problems.
Book Synopsis Vadose Zone Processes by : John S. Selker
Download or read book Vadose Zone Processes written by John S. Selker and published by CRC Press. This book was released on 1999-06-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vadose Zone Processes provides a unified, up-to-date treatment on the movement of water through unsaturated media. In addition to covering the basic equations governing the flow and fate of water in unsaturated media, the text covers the biogeochemistry of vadose environments and the statistical description of vadose processes. The authors emphasize maintaining an intuitive understanding of how the results are derived and how they are appropriately applied. This comprehensive and important book will be useful not only to those in traditional fields such as civil engineering, geology, crop science, chemical engineering, agricultural engineering, and hydrology but also in the newer environmental engineering fields including containment transport, pollution remediation, and waste disposal.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309484529 Total Pages :511 pages Book Rating :4.3/5 (94 download)
Book Synopsis Negative Emissions Technologies and Reliable Sequestration by : National Academies of Sciences, Engineering, and Medicine
Download or read book Negative Emissions Technologies and Reliable Sequestration written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-04-08 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: To achieve goals for climate and economic growth, "negative emissions technologies" (NETs) that remove and sequester carbon dioxide from the air will need to play a significant role in mitigating climate change. Unlike carbon capture and storage technologies that remove carbon dioxide emissions directly from large point sources such as coal power plants, NETs remove carbon dioxide directly from the atmosphere or enhance natural carbon sinks. Storing the carbon dioxide from NETs has the same impact on the atmosphere and climate as simultaneously preventing an equal amount of carbon dioxide from being emitted. Recent analyses found that deploying NETs may be less expensive and less disruptive than reducing some emissions, such as a substantial portion of agricultural and land-use emissions and some transportation emissions. In 2015, the National Academies published Climate Intervention: Carbon Dioxide Removal and Reliable Sequestration, which described and initially assessed NETs and sequestration technologies. This report acknowledged the relative paucity of research on NETs and recommended development of a research agenda that covers all aspects of NETs from fundamental science to full-scale deployment. To address this need, Negative Emissions Technologies and Reliable Sequestration: A Research Agenda assesses the benefits, risks, and "sustainable scale potential" for NETs and sequestration. This report also defines the essential components of a research and development program, including its estimated costs and potential impact.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309476550 Total Pages :125 pages Book Rating :4.3/5 (94 download)
Book Synopsis Environmental Engineering for the 21st Century by : National Academies of Sciences, Engineering, and Medicine
Download or read book Environmental Engineering for the 21st Century written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-03-08 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental engineers support the well-being of people and the planet in areas where the two intersect. Over the decades the field has improved countless lives through innovative systems for delivering water, treating waste, and preventing and remediating pollution in air, water, and soil. These achievements are a testament to the multidisciplinary, pragmatic, systems-oriented approach that characterizes environmental engineering. Environmental Engineering for the 21st Century: Addressing Grand Challenges outlines the crucial role for environmental engineers in this period of dramatic growth and change. The report identifies five pressing challenges of the 21st century that environmental engineers are uniquely poised to help advance: sustainably supply food, water, and energy; curb climate change and adapt to its impacts; design a future without pollution and waste; create efficient, healthy, resilient cities; and foster informed decisions and actions.
