Download or read book Debris Flows from Tributaries of the Colorado River Grand Canyon National Park Arizona written by Robert H. Webb and published by . This book was released on 1989 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Debris Flows from Tributaries of the Colorado River Grand Canyon National Park Arizona written by Robert H. Webb and published by . This book was released on 1989 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnitude and Frequency Data for Historic Debris Flows in Grand Canyon National Park and Vicinity Arizona written by and published by . This book was released on 1995 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Debris Flows in Grand Canyon National Park Arizona written by Theodore S. Melis and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Debris Flows from Tributaries of the Colorado River Grand Canyon National Park Arizona written by Robert H. Webb and published by . This book was released on 1987 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnitude and Frequency Data for Historic Debris Flows in Grand Canyon National Park and Vicinity Arizona written by Theodore S. Melis and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geomorphology of Debris Flows and Alluvial Fans in Grand Canyon National Park and Their Influence on the Colorado River Below Glen Canyon Dam Arizona written by Theodore S. Melis and published by . This book was released on 1997 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Debris flows from tributaries of the colorado rivers grand canyon national park arizona executive summary usgs ofr 87 117 written by Robert H. Webb and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Great Cataract written by Robert H. Webb and published by . This book was released on 1996 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Created by the USGS, this Web site is an electronic version of a 1996 report that discusses the great effects of the Late Holocene debris flows on Lava Falls Rapid, Grand Canyon National Park, Arizona, one of the most famous rapids in the world. This report examines the history of debris flow from Prospect Canyon and to document their effect on Lava Falls Rapid. It provides important information on how releases from Glen Canyon Dam may rework aggraded debris fans in Grand Canyon National Park.
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Debris Flows in Grand Canyon National Park written by Theodore S. Melis and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Initiation and frequency of debris flows in Grand Canyon Arizona written by Peter G. Griffiths and published by . This book was released on 1996 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frequency and Initiation of Debris Flows in Grand Canyon Arizona written by Peter G. Griffiths and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grand Canyon written by Robert H. Webb and published by University of Arizona Press. This book was released on 1996-05 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photographs made in Grand Canyon a century ago may provide us with a sense of history; photographs made today from the same vantage points give us a more precise picture of change in this seemingly timeless place. Between 1889 and 1890, Robert Brewster Stanton made photographs every one to two miles through the river corridor for the purpose of planning a water-level railroad route; he produced the largest collection of photographs of the Colorado River at one point in time. Robert Webb, a USGS hydrologist conducting research on debris flows in the Canyon, obtained the photographs, and from 1989 to 1995, he replicated all 445 of the views captured by Stanton, matching as closely as possible the original camera positions and lighting conditions. Grand Canyon, a Century of Change assembles the most dramatic of these paired photographs to demonstrate both the persistence of nature and the presence of humanity. The level of detail obtained from the photographs represent one of the most extensive long-term monitoring efforts ever conducted in a national park and the most detailed documentation effort ever performed using repeat photography. Much more than simply a picture book, Grand Canyon, a Century of Change is an environmental history of the river corridor, a fascinating book that clearly shows the impact of human influence on Grand Canyon and warns us that the Canyon's future is very much in our hands.
Download or read book The Controlled Flood in Grand Canyon written by Robert H. Webb and published by American Geophysical Union. This book was released on 1999-01-26 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 110. The natural flow of almost every river in the United States has been modified to meet various socioeconomic goals—navigation, irrigation, power generation and flood control. The success of the dams and reservoirs built to achieve these goals has been accompanied by changes in the status of riverine resources downstream, a cause of growing environmental and ecological concern. For example, before Glen Canyon Dam was completed, the Colorado River transported large quantities of sediment in floods as large as 8500 m3/s. After the dam was closed in 1963, dam releases typically were less than the powerplant capacity of 890 m3/s and exhibited large daily flow fluctuations. The river carried little sediment. The daily fluctuations in flow eroded sand bars, and the smaller, controlled flow did not redeposit them. The clear, cold water resulted in increased aquatic productivity such that rainbow trout and other nonnative fishes thrived while most native species were lost or endangered.
Download or read book Observations of Environmental Change in Grand Canyon Arizona written by U. S. Department U.S. Department of the Interior and published by CreateSpace. This book was released on 2015-07-06 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few scientific data have been collected on pre-dam conditions of the Colorado River corridor through Grand Canyon National Park. Using historical diaries, interviews with pre-dam river runners (referred to as the "Old Timers"), and historical scientific data and observations, we compiled anecdotal information on environmental change in Grand Canyon. The most significant changes are the: lowering of water temperature in the river, near-elimination of heavily sediment-laden flows, erosion of sand bars, invasion of non-native tamarisk trees, reduction in driftwood, development of marshes, increase in non-native fish at the expense of native fishes, and increase in water bird populations. In addition, few debris flows were observed before closure of Glen Canyon Dam, which might suggests that the frequency of debris flows in Grand Canyon has increased. Other possible changes include decreases in bat populations and increases in swallow and bighorn sheep populations, although the evidence is anecdotal and inconclusive. These results provide a perspective on managing the Colorado River that may allow differentiation of the effects of Glen Canyon Dam from other processes of change.
Download or read book Sediment Delivery by Ungaged Tributaries of the Colorado River in Grand Canyon U S Geological Survey Water Resources Investigations Report 00 4055 2000 written by and published by . This book was released on 2000 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
