Download or read book Modifying Borehole Dissolved Oxygen Levels as a Tool in Deciphering Fracture Flow Conditions written by Dariusz W. Chlebica and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modifying Borehole Dissolved Oxygen Levels as a Tool in Deciphering Fracture Flow Conditions written by and published by . This book was released on 2013 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Applications of the Dissolved Oxygen Alteration Method written by Sarah A Vitale and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed flow characterization in groundwater wells is important for water supply assessments, including the identification of water sources and evaluation of sustainability, discerning contamination sources and spreading, and in remediating contaminated groundwater. Despite advancements in groundwater flow characterization, its application remains limited primarily due to the high cost and logistical difficulty of conventional techniques. The series of applications described here are an expansion upon the dissolved oxygen alteration method, a borehole dilution technique originally developed by Chlebica and Robbins (2013) to locate transmissive fractures and decipher vertical borehole flow conditions in fractured crystalline bedrock wells, providing a qualitative assessment of in-well flow. The method involves bubbling air into a well using a porous polypropylene â€bubbler†, then profiling the dissolved oxygen with time. Inflow zones are identified by the regions where DO concentrations decrease over time. Vertical movement is determined by the vertical movement of diluted low-DO water and shifts in the DO profile. This work expands on the original method by developing advanced applications in crystalline bedrock wells for quantifying vertical flow rate, identifying interconnecting fractures between wells, and aiding in the sampling of individual fractures. The method was also further developed for characterizing flow conditions in screened wells in porous media. These advanced applications provide a cost-effective and highly-sensitive alternative for characterizing flow in wells to aid in water supply and contamination assessments.
Download or read book A Single Packer Method for Characterizing Water Contributing Fractures in Crystalline Bedrock Wells written by Neil Flahive and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The water levels and water quality obtained from open borehole wells in fractured bedrock are flow weighted averages that are a function of the hydraulic heads and transmissivities of water contributing fractures, which are rarely known. Without such knowledge using water levels and water quality data form fractured bedrock wells to assess contaminant conditions can be highly misleading. This study demonstrates a cost effective single packer fracture characterization method that can be used in fractured bedrock to determine the hydraulic heads and transmissivities of individual fracture zones. The method entails inflating a pipe plug to isolate sections of an open borehole at different depths and monitoring changes in water level with time. At each depth, the change in water level with time was used to determine the sum of fracture transmissivities above the packer and then to solve for individual fracture transmissivity. Steady state heads along with the transmissivities were used to determine fracture heads by solving for individual heads using the weighted average head equation. The method was tested in five wells in crystalline bedrock located at the University of Connecticut in Storrs. The wells had been previously logged with both conventional logging methods and the dissolved oxygen alteration method. The single packer head and transmissivity results were found to agree with borehole flow conditions determine by these other methods.
Download or read book Comparison of Approaches to Characterize Flow Conditions in Bedrock Wells written by Stephanie Phillips and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluating vertical flow in bedrock wells is important for understanding aquifer hydraulic parameters, and borehole flowmeter methods are critical for analyzing flow in fractured-rock aquifers. Single borehole logging is used to identify active hydraulic zones under ambient and pumping conditions, and crosshole flowmeter logging is used to identify hydraulic connections between boreholes. To identify potential zones of interest for flowmeter logging in fractured rock, first a series of conventional borehole logs are collected. Then, locations for flowmeter logging are selected and data are collected under ambient and stressed conditions to distinguish fracture flow zones. Because flowmeters are limited by their resolution and operational range, tool selection is critical and should be matched to site conditions and project goals. In this study, data were collected in three boreholes in a fractured rock setting in Storrs, Connecticut, to compare three flow logging methods. Prior to flow logging, acoustic- and optical-televiewer, fluid temperature, and conductivity logs were collected in the wells. Flow measurement data were collected under ambient and pumping conditions using spinner, heat-pulse, and electromagnetic flowmeters. Factors for comparing the flow data include the spatial resolution of flow zones, maximum and minimal flow detection rates, and rapidity and ease of data collection and analysis. Fracture transmissivity results of the flow logs were also compared to results from a dissolved oxygen alteration method and a newly designed packer method.
Download or read book A Guide to Regional Groundwater Flow in Fractured Rock Aquifers written by Peter G. Cook and published by CSIRO Publishing. This book was released on 2003-01-01 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes field methods for measuring rates of groundwater flow in fractured rock aquifers and draws heavily on results of three recent studies in the Clare Valley, South Australia; Atherton Tablelands, Queensland; and Wagga Wagga, NSW.
Download or read book Characterization Modeling Monitoring and Remediation of Fractured Rock written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2021-01-29 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractured rock is the host or foundation for innumerable engineered structures related to energy, water, waste, and transportation. Characterizing, modeling, and monitoring fractured rock sites is critical to the functioning of those infrastructure, as well as to optimizing resource recovery and contaminant management. Characterization, Modeling, Monitoring, and Remediation of Fractured Rock examines the state of practice and state of art in the characterization of fractured rock and the chemical and biological processes related to subsurface contaminant fate and transport. This report examines new developments, knowledge, and approaches to engineering at fractured rock sites since the publication of the 1996 National Research Council report Rock Fractures and Fluid Flow: Contemporary Understanding and Fluid Flow. Fundamental understanding of the physical nature of fractured rock has changed little since 1996, but many new characterization tools have been developed, and there is now greater appreciation for the importance of chemical and biological processes that can occur in the fractured rock environment. The findings of Characterization, Modeling, Monitoring, and Remediation of Fractured Rock can be applied to all types of engineered infrastructure, but especially to engineered repositories for buried or stored waste and to fractured rock sites that have been contaminated as a result of past disposal or other practices. The recommendations of this report are intended to help the practitioner, researcher, and decision maker take a more interdisciplinary approach to engineering in the fractured rock environment. This report describes how existing tools-some only recently developed-can be used to increase the accuracy and reliability of engineering design and management given the interacting forces of nature. With an interdisciplinary approach, it is possible to conceptualize and model the fractured rock environment with acceptable levels of uncertainty and reliability, and to design systems that maximize remediation and long-term performance. Better scientific understanding could inform regulations, policies, and implementation guidelines related to infrastructure development and operations. The recommendations for research and applications to enhance practice of this book make it a valuable resource for students and practitioners in this field.
Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contaminants in the Subsurface written by National Research Council and published by National Academies Press. This book was released on 2005-04-23 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: At hundreds of thousands of commercial, industrial, and military sites across the country, subsurface materials including groundwater are contaminated with chemical waste. The last decade has seen growing interest in using aggressive source remediation technologies to remove contaminants from the subsurface, but there is limited understanding of (1) the effectiveness of these technologies and (2) the overall effect of mass removal on groundwater quality. This report reviews the suite of technologies available for source remediation and their ability to reach a variety of cleanup goals, from meeting regulatory standards for groundwater to reducing costs. The report proposes elements of a protocol for accomplishing source remediation that should enable project managers to decide whether and how to pursue source remediation at their sites.
Download or read book Fractured Rock Hydrogeology written by John M. Sharp and published by CRC Press. This book was released on 2014-06-05 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding of groundwater flow and solute transport in fractured rocks is vital for analysis of water resources, water quality and environmental protection, geotechnical and engineering projects, and geothermal energy production. This book includes theoretical and practical analyses using numerical modelling, geochemistry, isotopes, aquifer tests, laboratory tests, field mapping, geophysics, geological analyses, and some unique combinations of these types of investigation. Current water resource and geotechnical problems and the techniques now used are also discussed. Aimed at practicing hydrogeologists, engineers, ecologists, resource managers, students and earth scientists.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1985 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residence Times and Nitrate Transport in Ground Water Discharging to Streams in the Chesapeake Bay Watershed written by and published by . This book was released on 2003 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1964 with total page 1024 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Research 1964 written by Geological Survey (U.S.) and published by . This book was released on 1964 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1964 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
