Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Sandbar deposition caused by high-flow experiments on the Colorado River downstream from Glen Canyon Dam: November 2012 – November 2018
The streamflow regime and sand supply of the Colorado River have been affected by the presence and operations of Glen Canyon Dam since filling of Lake Powell began in March 1963. Consequent changes in river morphology have included decreases in the size and abundance of sandbars used as campsites in Grand Canyon National Park (Dolan and others, 1974; Schmidt and Graf, 1990; Kearsley and others, 19
Authors
Paul Grams
Effects of high flow experiments on riparian vegetation resources in Grand Canyon
Flood events have historically had a strong impact on riparian vegetation within Grand Canyon. Pre-dam sandbars were nearly devoid of perennial riparian vegetation due to the magnitude and frequency of periodic floods (Turner and Karpiscak, 1980). Vegetation has increased since dam closure (Waring, 1995), particularly since the early 1990s (Sankey and others, 2015). This increase in vegetation is
Authors
B.J. Butterfield, Emily C. Palmquist, Joel B. Sankey
Polychlorinated biphenyls (PCBs) in the Pacific sand lance, Puget Sound, Washington
Forage fish are small, abundant, schooling planktivores that form a critical link in marine food webs by transferring energy from plankton up to birds, fishes, and marine mammals. Forage fishes in Puget Sound include the iconic Pacific herring as well as lesser known species such as surf smelt and the Pacific sand lance. There are significant knowledge gaps regarding the basic life history and p
Authors
Theresa Liedtke, Kathleen Conn, Richard Dinicola, Renee Takesue
High elevation sand/cultural Sites: The response of source-bordering aeolian dunefields to the 2012-2016 high flow experiments of the Colorado River in Grand Canyon (Extended Abstract)
Glen Canyon Dam has reduced downstream sediment supply to the Colorado River by about 95% in the reach upstream of the Little Colorado River confluence and by about 85% below the confluence (Topping and others, 2000). Operation of the dam for hydropower generation has additionally altered the flow regime of the river in Grand Canyon, largely eliminating pre-dam low flows (i.e., below 8,000 ft3/s)
Authors
Joel B. Sankey
Optimal timing of high-flow experiments for sandbar deposition
Sediment-transport theory and field measurements indicate that the greatest or most efficient deposition of sand in eddies occurs during controlled floods (a.k.a. High-Flow Experiments or HFEs) when the greatest amount of the finest sand is available on the bed of the Colorado River (Topping and others, 2010). Conducting HFEs when the sand on the bed of the Colorado River is depleted and coarse ca
Authors
David Topping, Paul E. Grams, Ronald E. Griffiths, Joseph E. Hazel, Matthew Kaplinski, David Dean, Nicholas Voichick, Joel Unema, Thomas A. Sabol
Estimating indirect impacts of wind-energy development for breeding grassland birds and waterfowl in the northern Great Plains
No abstract available.
Authors
Jill A. Shaffer, Charles R. Loesch, Deborah A. Buhl
Effects of high flow experiments on warm-water native and nonnative fishes
The harsh environmental conditions and extreme flooding that created Grand Canyon also shaped the unique native fish that evolved in the Colorado River. Native fish have evolved their physiology, morphology and behavior to withstand high flood events. Flooding has been shown to benefit spawning, survival and recruitment of juvenile native fishes in many southwestern rivers. Annual pre-dam flooding
Authors
David Ward
Effects of high flow events (and other factors) on Salmonids
Spring and fall high flow events released by Glen Canyon Dam appear to affect rainbow and brown trout in different ways that also very geographically, however other environmental factors are likely to play as important, or more important. Teasing apart impacts is made difficult by the lack of experimental design and limited replication of spring high flow events.
Authors
Charles B. Yackulic
Sources, timing, and fate of sediment and contaminants in the nearshore: insights from geochemistry
Rivers in Cascade watersheds carry sediment with a volcanic composition that is distinct from the plutonic composition of the Puget lowlands. Compositional properties (signatures) allow discrimination of river-sourced Cascade from lowland sediment, and inferences about transport pathways. Surface sediment on land contains atmospheric radionuclides whose known decay rates define monthly (7Be) and d
Authors
Renee K. Takesue, Kathleen E. Conn, Margaret Dutch
Quantitative coseismic and precipitation-induced landslide risk mapping for the country of Lebanon
Quantitative landslide risk assessment is a key step in creating appropriate land use policies. The forced migration of those displaced by recent events in Syria has highlighted the need for studies to guide humanitarian aid and resettlement policies. In 2011, armed conflict in the region precipitated the largest refugee crisis in a generation. Over 1.5 million displaced Syrians now reside in Leba
Authors
William Pollock, Joseph Wartman, Grace Abou-Jaoude, Alex R. R. Grant
Time-domain electromagnetic soundings for the delineation of saline groundwater in the Genesee River Valley, Western New York, 2016-2017
The U.S. Geological Survey, in cooperation with the New York State Department of Environmental Conservation, is investigating the distribution of saline groundwater in the Genesee River Valley near the former Retsof salt mine (fig. 1). As part of this study, paired time-domain electromagnetic (TEM) soundings and horizontal-to-vertical spectral ratio (HVSR) seismic soundings were made at 39 locatio
Authors
John H. Williams, William M. Kappel, Carole D. Johnson, Eric A. White, Paul M. Heisig, J. W. Lane
Sediment monitoring during Elwha River dam removals: Lessons learned during the Nation’s largest dam removal project
No abstract available.
Authors
Christopher A. Curran, Christopher S. Magirl, Robert C. Hilldale