Download or read book The Roles of Erosion Rate and Rock Strength in the Evolution of Canyons Along the Colorado River written by Andrew Lee Darling and published by . This book was released on 2016 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: For this dissertation, three separate papers explore the study areas of the western Grand Canyon, the Grand Staircase (as related to Grand Canyon) and Desolation Canyon on the Green River in Utah. In western Grand Canyon, I use comparative geomorphology between the Grand Canyon and the Grand Wash Cliffs (GWC). We propose the onset of erosion of the GWC is caused by slip on the Grand Wash Fault that formed between 18 and 12 million years ago. Hillslope angle and channel steepness are higher in Grand Canyon than along the Grand Wash Cliffs despite similar rock types, climate and base level fall magnitude. These experimental controls allow inference that the Grand Canyon is younger and eroding at a faster rate than the Grand Wash Cliffs. The Grand Staircase is the headwaters of some of the streams that flow into Grand Canyon. A space-for-time substitution of erosion rates, supported by landscape simulations, implies that the Grand Canyon is the result of an increase in base level fall rate, with the older, slower base level fall rate preserved in the Grand Staircase. Our data and analyses also support a younger, ~6-million-year estimate of the age of Grand Canyon that is likely related to the integration of the Colorado River from the Colorado Plateau to the Basin and Range. Complicated cliff-band erosion and its effect on cosmogenic erosion rates are also explored, guiding interpretation of isotopic data in landscapes with stratigraphic variation in quartz and rock strength. Several hypotheses for the erosion of Desolation Canyon are tested and refuted, leaving one plausible conclusion. I infer that the Uinta Basin north of Desolation Canyon is eroding slowly and that its form represents a slow, stable base level fall rate. Downstream of Desolation Canyon, the Colorado River is inferred to have established itself in the exhumed region of Canyonlands and to have incised to near modern depths prior to the integration of the Green River and the production of relief in Desolation Canyon. Analysis of incision and erosion rates in the region suggests integration is relatively recent.
Download or read book From Hillslopes to Canyons Studies of Erosion at Differing Time and Spatial Scales Within the Colorado River Drainage written by Christopher Tressler and published by . This book was released on 2011 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis includes two different studies in an attempt to investigate and better understand the key characteristics of landscape evolution. In the first study, the rate of surface particle creep was investigated through the use of Terrestrial lidar at an archaeological site in Grand Canyon National Park. The second study developed ways to quantify metrics of the Colorado River drainage and reports the role of bedrock strength in the irregular profile of the trunk Colorado River drainage. Archaeological sites along the Colorado River corridor in Grand Canyon National Park are eroding due to a variety of surficial processes. The nature of surface particle creep is difficult to quantify and managers of this sensitive landscape wish to know the rates of erosion in order to make timely decisions regarding preservation. In the first study, two scans of a single convex hillslope were collected over the span of 12 months through the use of a ground-based lidar instrument. The scans were used to track the movement of rock clasts. This study, with a relatively small data set, did not show the expected positive relations of creep rate to slope or clast size, but did not preclude the existence of these relations either. The remarkably irregular long profile of the Colorado River has inspired several questions about the role of knickpoint recession, tectonics, and bedrock in the landscape evolution of Grand Canyon and the region. Bedrock resistance to erosion has a fundamental role in controlling topography and surface processes. In this second study, a data set of bedrock strength data was compiled and presented, providing relations of bedrock strength to hydraulic-driving forces of the trunk Colorado River drainage. Results indicate that rock strength and topographic metrics are strongly correlated in the middle to lower reaches of the plateau drainage. In the upper reaches of the drainage, intact-rock strength values are ~25% higher without a matching increase in stream power. As more tensile strength samples are analyzed and appropriately scaled with respect to fracturing and shale content, we believe we will see a clearer and more consistent pattern in the upper reaches.
Download or read book Colorado River written by Richard A. Young and published by . This book was released on 2001 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers on the geology of the Grand Canyon and the Colorado River is an outgrowth of informal conversations among Colorado Plateau geologists over a period of several years.
Download or read book Contested Waters written by April R. Summitt and published by University Press of Colorado. This book was released on 2013-04-15 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: "To fully understand this river and its past, one must examine many separate pieces of history scattered throughout two nations--seven states within the United States and two within Mexico--and sort through a large amount of scientific data. One needs to be part hydrologist, geologist, economist, sociologist, anthropologist, and historian to fully understand the entire story. Despite this river's narrow size and meager flow, its tale is very large indeed." -From the conclusion The Colorado River is a vital resource to urban and agricultural communities across the Southwest, providing water to 30 million people. Contested Waters tells the river's story-a story of conquest, control, division, and depletion. Beginning in prehistory and continuing into the present day, Contested Waters focuses on three important and often overlooked aspects of the river's use: the role of western water law in its over-allocation, the complexity of power relationships surrounding the river, and the concept of sustainable use and how it has been either ignored or applied in recent times. It is organized in two parts, the first addresses the chronological history of the river and long-term issues, while the second examines in more detail four specific topics: metropolitan perceptions, American Indian water rights, US-Mexico relations over the river, and water marketing issues. Creating a complete picture of the evolution of this crucial yet over-utilized resource, this comprehensive summary will fascinate anyone interested in the Colorado River or the environmental history of the Southwest.
Download or read book A Wild Red River Tamed written by Pete Klocki and published by iUniverse. This book was released on 2009-12 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A WILD REDHEAD TAMED"--A brief history of the steps to contain and control the mighty Colorado River. Prior to man's control of the Colorado River, it ran red, wild, and full of silt. Today we have the two largest man-made reservoirs in the U.S. on the Colorado River, an incomparable rafting experience in the Grand Canyon, and power and water for people living in the west. The crown jewel of the Colorado is without a doubt, Lake Powell. Read the history of each of Lake Powell's canyons to enhance your Lake Powell visit and knowledge of the history of the Colorado River basin.
Download or read book The Colorado River Through Grand Canyon written by Steven Warren Carothers and published by . This book was released on 1991 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adjustment to the environmental alterations of the Glen Canyon Dam.
Download or read book The River Knows Everything written by James M. Aton and published by University Press of Colorado. This book was released on 2009-04-15 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Desolation Canyon is one of the West's wild treasures. Visitors come to study, explore, run the river, and hike a canyon that is deeper at its deepest than the Grand Canyon, better preserved than most of the Colorado River system, and full of eye-catching geology-castellated ridges, dramatic walls, slickrock formations, and lovely beaches. Rafting the river, one may see wild horses, blue herons, bighorn sheep, and possibly a black bear. Signs of previous people include the newsworthy, well-preserved Fremont Indian ruins along Range Creek and rock art panels of Nine Mile Canyon, both Desolation Canyon tributaries. Historic Utes also pecked rock art, including images of graceful horses and lively locomotives, in the upper canyon. Remote and difficult to access, Desolation has a surprisingly lively history. Cattle and sheep herding, moonshine, prospecting, and hideaways brought a surprising number of settlers--ranchers, outlaws, and recluses--to the canyon.
Download or read book The Exploration of the Colorado River and Its Canyons written by John Wesley Powell and published by Courier Corporation. This book was released on 1961-01-01 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: The uncut version of Powell's narrative covering his exploration of the Colorado River.
Download or read book The Colorado River written by United States. Bureau of Reclamation and published by . This book was released on 1946 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Colorado Plateau written by Donald L. Baars and published by UNM Press. This book was released on 2000 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written with the general reader in mind, this is the updated edition of the classic on the geology of the red rock and canyon country of the Fours Corners region of Utah, Colorado, Arizona, and New Mexico.
Download or read book The Colorado River written by United States. Bureau of Reclamation. Region 3 and published by . This book was released on 1945 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Cenozoic Lava Dams in the Western Grand Canyon written by William Kenneth Hamblin and published by Geological Society of America. This book was released on 1994 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Late Cenozoic history of the western Grand Canyon is one of profound and rapid transformation. The constantly changing morphology and dynamics of the canyon during this period have been recorded in spectacular geologic features, such as frozen lava cascades and lava dams, as well as volcanic cones, necks, and dikes. All of these unique features, which make the western part of the Grand Canyon strikingly different from other parts, resulted from the interaction of basaltic lava flows and vigorous erosion by the Colorado River. The volcanic phenomena in the Grand Canyon were created by eruptions of basaltic lava in the southernmost part of the Uinkaret volcanic field. Some lava flows were extruded on the Uinkaret Plateau and cascaded over the outer rim of the Grand Canyon into Toroweap Valley and Whitmore Wash, while others were extruded within the Grand Canyon itself and partly covered the Esplanade Platform. The remaining flows cascaded over the rim of the canyon's inner gorge. Red molten rock cascading into the canyon and forming lava dams must have presented a spectacular scene, the likes of which have never been viewed by human beings. Even more spectacular is how quickly these lava dams formed - from small single-flow dams that were created in only a few days, to complex, multiple-flow dams that took several thousand years. The dams were then destroyed when the water impounded behind them ultimately overflowed. Although their construction and destruction occurred in a geologic instant, these events were the most significant in the late Cenozoic history of the Grand Canyon. Because of the largely inaccessible nature of the western part of the canyon, the author and his field assistants researching this area had to be creative in their data-gathering techniques. For example, they made photo mosaics of the entire canyon wall using a hand-held aerial camera; these mosaics served as cross sections on which all geological data were plotted. In addition, to photograph features hidden from view at river level, they utilized light aircraft and helicopters. Finally, a professional mountain climber collected samples from various units exposed high on vertical cliffs. Memoir 183 is a compilation of this field work, which took more than two decades to complete. It contains numerous maps, photographs, and cross sections of frozen lava cascades and the remnants of a sequence of 13 major lava dams that once formed huge barriers to the Colorado River. The volume also discusses the history of lakes that formed behind these lava dams and the associated sedimentary deposits that once partly filled the Grand Canyon. The results of this study provide new insights into the rates at which the Colorado River is able to downcut its channel, as well as the major factors that controlled erosion of the Grand Canyon.
Download or read book River Resource Management in the Grand Canyon written by National Research Council and published by National Academies Press. This book was released on 1996-02-29 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Federal management of water is undergoing a change that involves a drastic reduction in the number of new water projects and an increase in emphasis on the quality of water management. This book summarizes and analyzes environmental research conducted in the lower Colorado River below the Glen Canyon Dam under the leadership of the Bureau of Reclamation. It reviews alternative dam operations to mitigate impacts in the lower Colorado riverine environment and the strengths and weaknesses of large federal agencies dealing with broad environmental issues and hydropower production. While many problems remain to be solved, the Bureau of Reclamation through the Glen Canyon area. The lessons of GCES are transferable to other locations and could be the basis for a new era in the management of western waters.
Download or read book Vision and Place written by Jason Robison and published by University of California Press. This book was released on 2020-10-27 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Colorado River Basin’s importance cannot be overstated. Its living river system supplies water to roughly forty million people, contains Grand Canyon National Park, Bears Ears National Monument, and wide swaths of other public lands, and encompasses ancestral homelands of twenty-nine Native American tribes. John Wesley Powell, a one-armed Civil War veteran, explorer, scientist, and adept federal administrator, articulated a vision for Euro-American colonization of the “Arid Region” that has indelibly shaped the basin—a pattern that looms large not only in western history, but also in contemporary environmental and social policy. One hundred and fifty years after Powell’s epic 1869 Colorado River Exploring Expedition, this volume revisits Powell’s vision, examining ts historical character and its relative influence on the Colorado River Basin’s cultural and physical landscape in modern times. In three parts, the volume unpacks Powell’s ideas on water, public lands, and Native Americans—ideas at once innovative, complex, and contradictory. With an eye toward climate change and a host of related challenges facing the basin, the volume turns to the future, reflecting on how—if at all—Powell’s legacy might inform our collective vision as we navigate a new “Great Unknown.”
Download or read book Damming Grand Canyon written by Diane E Boyer and published by . This book was released on 2007-05-07 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1923, America paid close attention, via special radio broadcasts, newspaper headlines, and cover stories in popular magazines, as a government party descended the Colorado to survey Grand Canyon. Fifty years after John Wesley Powell's journey, the canyon still had an aura of mystery and extreme danger. At one point, the party was thought lost in a flood. Something important besides adventure was going on. Led by Claude Birdseye and including colorful characters such as early river-runner Emery Kolb, popular writer Lewis Freeman, and hydraulic engineer Eugene La Rue, the expedition not only made the first accurate survey of the river gorge but sought to decide the canyon's fate. The primary goal was to determine the best places to dam the Grand. With Boulder Dam not yet built, the USGS, especially La Rue, contested with the Bureau of Reclamation over how best to develop the Colorado River. The survey party played a major role in what was known and thought about Grand Canyon. The authors weave a narrative from the party's firsthand accounts and frame it with a thorough history of water politics and development and the Colorado River. The recommended dams were not built, but the survey both provided base data that stood the test of time and helped define Grand Canyon in the popular imagination. Also by Robert Webb: Lee's Ferry
Download or read book Boulder Canyon Project Introductory Bulletin 1 General history and description of project 1948 Bulletin 2 Hoover dam power and water contrasts and related data 1950 written by United States. Bureau of Reclamation and published by . This book was released on 1950 with total page 1580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Grand Colorado written by Tom H. Watkins and published by . This book was released on 1969 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over two hundred photos and illustrations accompany a history of the Colorado River, from ancient times to the present.
