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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Geochemical data for produced waters from conventional and unconventional oil and gas wells: Results from Colorado, USA
Geochemical data for more than 120,000 oil and natural gas wells from the major sedimentary basins in the USA are listed in the USGS National Produced Waters Geochemical Database [1]. In this summary, we report and discuss the geochemical data on produced waters obtained from published literature and the Colorado Oil and Gas Conservation Commission (COGCC) from close to 4,000 new oil and gas wells
Authors
Yousif Kharaka, Kathleen Gans, James Thordsen, Madalyn S. Blondes, Mark A Engle
A 20-year record of water chemistry in an alpine setting, Mount Emmons, Colorado, USA
From 1997 to the present, the U.S. Geological Survey and other agencies have been collecting water samples for chemical analyses on Mount Emmons in central Colorado, USA. The geology of Mount Emmons is dominated by Upper Cretaceous to Paleogene sediments of marine to continental origin, with felsic intrusive rocks interrupting the sedimentary block. Extensive sulphide-rich alteration accompanied t
Authors
Richard Wanty, Andrew H. Manning, Michaela Johnson, Philip Verplanck
Integrating structure from motion, numerical modelling and field measurements to understand carbonate sediment transport in coral reef canopies
Reef canopies are complex and extremely variable across a range of spatial scales. This variability affects the velocity above as well as within the canopy, and directly impacts the transport of sediment along the bed as well as suspended in the water column. How a canopy affects the transport of sediment is important to understand and predict changes in the position of the adjacent shoreline, par
Authors
Andrew Pomeroy, Curt D. Storlazzi, Kurt J. Rosenberger, Gerry Hatcher, Jonathan Warrick
The influence of sea level on incident and infragravity wave-driven sediment dynamics across a fringing coral reef
Coral reefs generate significant volumes of carbonate sediment that becomes the primary source of beach material along many low-latitude shorelines that protect hundreds of millions of people globally. Despite this fact, there is little understanding of the specific processes that transport the carbonate sediment produced on the outer portions of coral reefs to the shoreline, let alone how those p
Authors
Curt D. Storlazzi, Olivia Cheriton, Kurt J. Rosenberger, Andrew Pomeroy, Ryan J. Lowe
Measuring settling velocity in a strongly tidal estuary
Predicting sediment transport in estuarine systems requires understanding sediment settling velocity, its range of fluctuations, and the shortcomings of the tools to measure it. Previous studies have used Laser In-Situ Scattering and Transmissometry (LISST) instruments to measure particle size and Acoustic Doppler Velocimeters (ADV) to return estimates of settling velocity. We deployed both instru
Authors
Rachel Allen, Jessica R. Lacy, Evan A Variano
Controls on sediment transport over coral reefs off southwest Puerto Rico: Seasonal patterns and Hurricane Maria
Guánica Bay in southwest Puerto Rico is highly turbid and has some of the highest PCB concentrations in the USA. To investigate how and to what extent the bay waters influence coral reef ecosystem health along the coastline, 6 months of hydrodynamic data were collected at 8 sites on the insular shelf. Bed shear stresses were primarily driven by waves and were weakest at the site closest to La Parg
Authors
Olivia Cheriton, Curt D. Storlazzi, Kurt J. Rosenberger, Clark Sherman
Variability of estimated ultimate recovery in shale oil and shale gas accumulations in the U.S.
Variability of mean EURs within and between unconventional reservoirs is becoming more apparent as thousands of wells are drilled and oil and gas is produced from unconventional low-permeability reservoirs. Production from many of these reservoirs shows that there is spatial heterogeneity of EURs, which is mainly related to geologic characteristics. The more refined view of spatial heterogeneity r
Authors
Christopher J. Schenk, Heidi M. Leathers-Miller
Application of sediment end-member analysis for understanding sediment fluxes, northern Chandeleur Islands, Louisiana
We analyzed grain-size distributions (GSDs) from a time-series of sediment samples to evaluate sediment transport following anthropogenic sand-berm emplacement at the northern Chandeleur Islands, Louisiana. End-member analysis (EMA) was applied to compare the end-member (EM) GSD of a known sediment source to GSDs from surrounding environments and characterize the physical redistribution of source
Authors
Julie Bernier, Jennifer L. Miselis, Noreen A. Buster, James G. Flocks
Toward a national coastal hazard forecast of total water levels
Storm surge and large waves combine to erode beaches, cause marsh and coral decay, and inundate low-elevation areas, resulting in hazards to coastal communities and loss of natural resources. The USGS, in collaboration with NOAA, is developing a real-time system to provide ∼ 6-day forecasts of total water levels (TWLs) combining tides, storm surge, and wave runup. TWL is compared with dune elevati
Authors
Alfredo Aretxabaleta, Kara S. Doran, Joseph W. Long, Li H. Erikson
Constraining parameter uncertainty in modeling debris-flow initiation during the September 2013 Colorado Front Range storm
The occurrence of debris flows during the September 2013 northern Colorado floods took the emergency management community by surprise. The September 2013 debris flows in the Colorado Front Range initiated from shallow landslides in colluvium. Most occurred on south- and east-facing slopes on the walls of steep canyons in crystalline rocks and on sedimentary hogbacks. Previous studies showed that m
Authors
Rex L. Baum, C.R. Scheevel, Eric S. Jones
Surrogate model development for coastal dune erosion under storm conditions
Early coastal dune erosion predictions are essential to avoid potential flood consequences but most dune erosion numerical models are computationally expensive, hence their application in Early Warning Systems is limited. Here, based on a combination of optimally sampled synthetic sea storms with a calibrated and validated XBeach model, we develop a surrogate model capable of producing fast and ac
Authors
Victor Malagon-Santos, Thomas Wahl, Joseph W Long, Davina Passeri, Nathaniel G. Plant
Using a GIS to populate 3D geocellular geologic models
No abstract available
Authors
Donald S. Sweetkind, Geoffrey Cromwell