Download or read book Geochemical Clues to Groundwater Sources of the Pedernales River Texas written by Sarah Jo Zappitello and published by . This book was released on 2016 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interactions between aquifers and rivers are recognized as important components of the hydrologic system. Central Texas rivers and aquifers are especially well connected due to karstic carbonate geology where gaining and losing streams, springs, and caves are common. The Pedernales River is an important source of water for local communities, the city of Austin, and downstream water users of the Colorado River, to which it drains. The Pedernales River Basin is surrounded by rapidly developing areas with increasing water demands, but the majority of the watershed is developed only for agriculture. Identifying critical areas for water quality and quantity protection while the land is still relatively undeveloped creates an opportunity for proactive water resource protection. The primary objectives of this study were: 1) to compare water quality and geochemistry of water from the Pedernales River, its tributaries, springs across the basin, wells screened in specific aquifers, and historic data; 2) to identify groundwater sources of the river; and 3) to assess whether or not changes in water quality have occurred in the Pedernales River between 1962 and 2015. By conducting this study during baseflow conditions, the water sources are assumed to originate exclusively from groundwater, as opposed to runoff or soil interflow. Geospatial information was evaluated for springs, surface geology, and river gains and losses. Stable isotope ratios, principal component analysis, and spatial analysis highlight the importance of groundwater contributions and human impacts to the river and indicate that evaporation is controlling the geochemical evolution of surface waters. Water quality throughout the watershed was generally good. Hydrogen and oxygen stable isotope ratios for spring and well samples defined a regional groundwater signature, and tributary and main river samples plotted along an evaporative trend with the groundwater signature as the source. Principal component analysis identified two groups of variables which strongly represent variation in sample geochemistry: humanly impacted variables and groundwater signature variables. Spatial analysis also revealed patterns of human impacts and groundwater inputs. The groundwater source locations were combined with surface geology to identify host geologic unit, and therefore source aquifers, of groundwater in the river basin. Groundwater in the Pedernales River is derived from the Edwards-Trinity Plateau Aquifer, the Trinity Aquifer, the Marble Falls Aquifer, and the Ellenburger-San Saba Aquifer.
Download or read book Geochemistry of Ground Water in Alluvial Basins of Arizona and Adjacent Parts of Nevada New Mexico and California written by Frederick N. Robertson and published by . This book was released on 1989 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: See journals under US Geological survey. Prof. paper 1406-C.
Download or read book Delineating Controls on Hydrologic Variability and Water Geochemistry in Central Texas written by Corinne Wong and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a strong concern about how water resources will be affected by future climate change. Investigation of how a hydrologic system might respond to climate change, however, requires a detailed understanding of the controls on and factors that might affect that system. The research presented in this dissertation focuses on improving the understanding of the Barton Springs segment of the Edwards aquifer in central Texas. The first three chapters of this dissertation present research investigating spatial and temporal controls on groundwater geochemistry. The fourth chapter focuses on characterizing and understanding the controls on long-term hydrologic variability by reconstructing past climate from a speleothem (cave mineral deposit) collected from a central Texas cave. On spatial scales, Edwards aquifer groundwater geochemistry is influenced by water-rock interaction (calcite and dolomite recrystallization, gypsum dissolution, and calcite precipitation) and mixing between fresh groundwater and saline groundwater. On temporal scales, variation in groundwater geochemistry is dictated by the extent to which fresh groundwater mixes with recharging stream water. The degree of mixing is sensitive to changes in climate conditions (i.e., more mixing under wetter conditions) and type of flow path (i.e., conduit or diffuse) that dominantly supplies a given site. The geochemistry of stream water, which provides the majority of recharge to the aquifer, is degrading over time and indirectly controlled by anthropogenic sources under both wet and dry conditions. Climate reconstructed from a speleothem suggests that central Texas moisture conditions were relatively constant from the mid to late Holocene (0 to 7 ka), except for an extended dry interval from 0.5 to 1.5 ka. Speleothem [delta]18O values spike during this dry interval, suggesting that decreases in Pacific-derived moisture or decreased tropical storm activity might have been coincident with the prolonged dry interval. This research has improved understanding of the natural variability of and controls on physical and geochemical components of hydrologic system in central Texas.
Download or read book Delineating Controls on Hydrologic Variability and Water Geochemistry in Central Texas written by Corinne I. Wong and published by . This book was released on 2013 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a strong concern about how water resources will be affected by future climate change. Investigation of how a hydrologic system might respond to climate change, however, requires a detailed understanding of the controls on and factors that might affect that system. The research presented in this dissertation focuses on improving the understanding of the Barton Springs segment of the Edwards aquifer in central Texas. The first three chapters of this dissertation present research investigating spatial and temporal controls on groundwater geochemistry. The fourth chapter focuses on characterizing and understanding the controls on long-term hydrologic variability by reconstructing past climate from a speleothem (cave mineral deposit) collected from a central Texas cave. On spatial scales, Edwards aquifer groundwater geochemistry is influenced by water-rock interaction (calcite and dolomite recrystallization, gypsum dissolution, and calcite precipitation) and mixing between fresh groundwater and saline groundwater. On temporal scales, variation in groundwater geochemistry is dictated by the extent to which fresh groundwater mixes with recharging stream water. The degree of mixing is sensitive to changes in climate conditions (i.e., more mixing under wetter conditions) and type of flow path (i.e., conduit or diffuse) that dominantly supplies a given site. The geochemistry of stream water, which provides the majority of recharge to the aquifer, is degrading over time and indirectly controlled by anthropogenic sources under both wet and dry conditions. Climate reconstructed from a speleothem suggests that central Texas moisture conditions were relatively constant from the mid to late Holocene (0 to 7 ka), except for an extended dry interval from 0.5 to 1.5 ka. Speleothem [delta]18O values spike during this dry interval, suggesting that decreases in Pacific-derived moisture or decreased tropical storm activity might have been coincident with the prolonged dry interval. This research has improved understanding of the natural variability of and controls on physical and geochemical components of hydrologic system in central Texas.
Download or read book Geochemical evolution processes and water quality observations based on results of the National Water Quality Assessment Program in the San Antonio segment of the Edwards Aquifer Texas 1996 2006 written by and published by . This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Evolution Processes and Water Quality Observations Based on Results of the National Water Quality Assessment Program in the San Antonio Segment of the Edwards Aquifer Texas 1996 2006 written by MaryLynn Musgrove and published by Geological Survey (USGS). This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Isotope and Geochemical Investigation of Groundwater in Big Bend National Park Texas written by Hector Javier Lopez Sepulveda and published by . This book was released on 1984 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconnaisssance Investigation of the Ground water Resources of the Red River Sulphur River and Cypress Creek Basins Texas written by Texas Board of Water Engineers and published by . This book was released on 1963 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A geochemical investigation concerning the baseflow water quality of the South Bosque River and Harris Creek McLennan County central Texas written by Christopher L. Sembritzky and published by . This book was released on 1997 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemistry of oilfield waters written by and published by Elsevier. This book was released on 1975-01-01 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geochemistry of oilfield waters
Download or read book Engineering Geology for Underground Rocks written by Suping Peng and published by Springer Science & Business Media. This book was released on 2007-10-14 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professionals and students in any geology-related field will find this an essential reference. It clearly and systematically explains underground engineering geology principles, methods, theories and case studies. The authors lay out engineering problems in underground rock engineering and how to study and solve them. The book specially emphasizes mechanical and hydraulic couplings in rock engineering for wellbore stability, mining near aquifers and other underground structures where inflow is a problem.
Download or read book Position Navigation and Timing Technologies in the 21st Century written by Y. Jade Morton and published by John Wiley & Sons. This book was released on 2021-01-13 with total page 1170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the latest developments in PNT technologies, including integrated satellite navigation, sensor systems, and civil applications Featuring sixty-four chapters that are divided into six parts, this two-volume work provides comprehensive coverage of the state-of-the-art in satellite-based position, navigation, and timing (PNT) technologies and civilian applications. It also examines alternative navigation technologies based on other signals-of-opportunity and sensors and offers a comprehensive treatment on integrated PNT systems for consumer and commercial applications. Volume 1 of Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications contains three parts and focuses on the satellite navigation systems, technologies, and engineering and scientific applications. It starts with a historical perspective of GPS development and other related PNT development. Current global and regional navigation satellite systems (GNSS and RNSS), their inter-operability, signal quality monitoring, satellite orbit and time synchronization, and ground- and satellite-based augmentation systems are examined. Recent progresses in satellite navigation receiver technologies and challenges for operations in multipath-rich urban environment, in handling spoofing and interference, and in ensuring PNT integrity are addressed. A section on satellite navigation for engineering and scientific applications finishes off the volume. Volume 2 of Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications consists of three parts and addresses PNT using alternative signals and sensors and integrated PNT technologies for consumer and commercial applications. It looks at PNT using various radio signals-of-opportunity, atomic clock, optical, laser, magnetic field, celestial, MEMS and inertial sensors, as well as the concept of navigation from Low-Earth Orbiting (LEO) satellites. GNSS-INS integration, neuroscience of navigation, and animal navigation are also covered. The volume finishes off with a collection of work on contemporary PNT applications such as survey and mobile mapping, precision agriculture, wearable systems, automated driving, train control, commercial unmanned aircraft systems, aviation, and navigation in the unique Arctic environment. In addition, this text: Serves as a complete reference and handbook for professionals and students interested in the broad range of PNT subjects Includes chapters that focus on the latest developments in GNSS and other navigation sensors, techniques, and applications Illustrates interconnecting relationships between various types of technologies in order to assure more protected, tough, and accurate PNT Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications will appeal to all industry professionals, researchers, and academics involved with the science, engineering, and applications of position, navigation, and timing technologies. pnt21book.com
Download or read book Transboundary Water Resources Management written by Jacques Ganoulis and published by John Wiley & Sons. This book was released on 2013-09-13 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on an international symposium addressing a key issue in global development, this reference includes both the latest methodologies for and practical examples of effective management of transboundary water resources. Its multidisciplinary approach combines hydrology and environmental science with economic and political approaches, in line with new UNESCO and EU recommendations, which have been formulated and implemented with the active involvement of all three editors. By providing a theoretical framework as well as abundant case studies from southern Europe, Africa, Asia and South America, this handbook provides hydrologists, geologists, engineers and decision-makers with all the knowledge they need for their daily work.
Download or read book Water for Texas written by Jim Norwine and published by Texas A&M University Press. This book was released on 2005 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than the economy, more than changing demographics, evenmore than education, water is the key to the future of Texas. It is not much of an overstatement to claim that water is the future of Texas. In the fall of 2000, a conference on "the world's most crucial natural resource" was held at Texas A&M University. It was a gathering of people with many viewpoints and areas of expertise, all focused on what the book's editors rightly say is and will be the state's definingissue--water. Together, the observations and recommendations brought together in this volume represent some of the best thinking about Texas' connections with water--in the past, present, and future. Ranging from broad historical overviews to technical and scientific discussions, the chapters address the questions of where we have been and where we are headed as we enter a new century of challenges to provide water for Texas.
Download or read book The University of Texas at Austin written by Richard Cleary and published by Princeton Architectural Press. This book was released on 2011-08-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The newest title in Princeton Architectural Press's Campus Guide series takes readers on an architectural tour of the University of Texas at Austin's history from its foundation in 1883 to present-day. Beautifully photographed in full color, along with a selection of rarely seen archival imagery, the guide presents the history of UT-Austin through six architectural walks, revealing the stories behind both the historic and contemporary buildings. Featuring buildings designed by prominent Texan architects like Herbert M. Greene of Greene, La Roche and Dahl; internationally known designs from the likes of Paul Cret, Gordon Bunshaft and development of the current master plan by Cesar Pelli, The University of Texas at Austin is the definitive history of UT's architectural growth and maturity, mirroring its ascent as one of America's premiere centers of higher learning.
Download or read book Seismic Geomorphology written by R. J. Davies and published by Geological Society of London. This book was released on 2007 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are poised to embark on a new era of discovery in the study of geomorphology. The discipline has a long and illustrious history, but in recent years an entirely new way of studying landscapes and seascapes has been developed. It involves the use of 3D seismic data. Just as CAT scans allow medical staff to view our anatomy in 3D, seismic data now allows Earth scientists to do what the early geomorphologists could only dream of - view tens and hundreds of square kilometres of the Earth's subsurface in 3D and therefore see for the first time how landscapes have evolved through time. This volume demonstrates how Earth scientists are starting to use this relatively new tool to study the dynamic evolution of a range of sedimentary environments.
Download or read book The Biosphere written by Vladimir I. Vernadsky and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Vladimir Vernadsky was a brilliant and prescient scholar-a true scientific visionary who saw the deep connections between life on Earth and the rest of the planet and understood the profound implications for life as a cosmic phenomenon." -DAVID H. GRINSPOON, AUTHOR OF VENUS REVEALED "The Biosphere should be required reading for all entry level students in earth and planetary sciences." -ERIC D. SCHNEIDER, AUTHOR OF INTO THE COOL: THE NEW THERMODYNAMICS OF CREATIVE DESTRUCTION
