Channel Changes Downstream from Dams
Author | : |
Publisher | : |
Total Pages | : 76 |
Release | : 1974 |
Genre | : Channels (Hydraulic engineering) |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : 76 |
Release | : 1974 |
Genre | : Channels (Hydraulic engineering) |
ISBN | : |
Author | : Kyle E. Juracek |
Publisher | : |
Total Pages | : 36 |
Release | : 2001 |
Genre | : Reservoirs |
ISBN | : |
Author | : Daryl B. Simons |
Publisher | : |
Total Pages | : 360 |
Release | : 1981 |
Genre | : Channels (Hydraulic engineering) |
ISBN | : |
Author | : Garnett P. Williams |
Publisher | : |
Total Pages | : 96 |
Release | : 1984 |
Genre | : Alluvial streams |
ISBN | : |
Author | : Michael Collier |
Publisher | : DIANE Publishing |
Total Pages | : 108 |
Release | : 2000 |
Genre | : Akarsular |
ISBN | : 9780788126987 |
Dams & river regulation have become an integral part of 20th-century landscape & livelihood. Virtually every river in the lower 48 states is now regulated by dams, locks, or diversions. This report illustrates the downstream consequences of dams & explains the basis on which rivers can be scientifically managed. Following a look at a free-flowing river -- the upper Salt River of Arizona -- & its natural cycles of flow & sediment, 6 regulated rivers are examined. Each of these rivers -- the Snake, Rio Grande, Chattahoochee, Platte, Green & Colorado -- highlights a particular use of a dam or a particular downstream effect.
Author | : Shawn Aaron Blobaum |
Publisher | : |
Total Pages | : 146 |
Release | : 1998 |
Genre | : Dams |
ISBN | : |
Author | : Seth E. Studley |
Publisher | : |
Total Pages | : 20 |
Release | : 1996 |
Genre | : Neosho River (Kan. and Okla.) |
ISBN | : |
Author | : Cara Walter |
Publisher | : |
Total Pages | : 118 |
Release | : 2009 |
Genre | : Aerial photography in hydrology |
ISBN | : |
The objective of this study was to evaluate the use of aerial photos as a substitute for multiple-year pre-removal field data to assess the downstream channel changes associated with a small dam removal. The Brownsville Dam, a 2.1 m tall concrete dam on the Calapooia River, Oregon, was removed in 2007. We surveyed cross sections below the dam during the summers prior to (2007) and follow (2008) removal, and we analyzed aerial photos from 1994 to 2006. The field surveys and aerial photos were used to map the low flow channel and bars over 1.3 km downstream from the dam and in an upstream control reach. Three types of measurement error (position error, identification error, and wetted boundary datum error) were assessed for the field surveys and aerial photos in order make the two methods of measurement more comparable. The first year after the dam removal, we observed changes in bar width, wetted width, and wetted width midpoint as large as 17 m ± 3 m immediately below the dam. We inferred that channel changes below the dam after removal were a result of the removal through comparison with pre-dam removal aerial photos, where changes up to 67 m ± 24 m were predominantly far from the dam, and an upstream control, where changes were only as large as 9 m ± 5 m. We conclude with suggestions of best practices for reducing errors, including establishment of permanent monuments for field surveys, taking measurements at similar, well-known discharges, and generating the highest-quality digital aerial photos through source and scanning choices.
Author | : Bruce L. Rhoads |
Publisher | : Cambridge University Press |
Total Pages | : 544 |
Release | : 2020-04-29 |
Genre | : Science |
ISBN | : 1108173780 |
Rivers are important agents of change that shape the Earth's surface and evolve through time in response to fluctuations in climate and other environmental conditions. They are fundamental in landscape development, and essential for water supply, irrigation, and transportation. This book provides a comprehensive overview of the geomorphological processes that shape rivers and that produce change in the form of rivers. It explores how the dynamics of rivers are being affected by anthropogenic change, including climate change, dam construction, and modification of rivers for flood control and land drainage. It discusses how concern about environmental degradation of rivers has led to the emergence of management strategies to restore and naturalize these systems, and how river management techniques work best when coordinated with the natural dynamics of rivers. This textbook provides an excellent resource for students, researchers, and professionals in fluvial geomorphology, hydrology, river science, and environmental policy.
Author | : Kyle E. Juracek |
Publisher | : |
Total Pages | : 4 |
Release | : 1999 |
Genre | : Neosho River (Kan. and Okla.) |
ISBN | : |