Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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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New methods for predicting and measuring dispersion in rivers
To develop a better predictive tool for dispersion in rivers over a range of temporal and spatial scales, our group has developed a simple Lagrangian model that is applicable for a wide range of coordinate systems and flow modeling methodologies. The approach allows dispersion computations for a large suite of discretizations, model dimensions (1-, 2-, or 3-dimensional), spatial and temporal discr
Authors
Jonathan M. Nelson, Richard R. McDonald, Carl J. Legleiter, Paul J. Kinzel, Travis Terrell Ramos, Yutaka Higashi, Il Won Seo, Donghae Baek, Du Han Lee, Yonguk Ryu
Similarity assessment of linear hydrographic features using high performance computing
This work discusses a current open source implementation of a line similarity assessment workflow to compare elevation-derived drainage lines with the high-resolution National Hydrography Dataset (NHD) surface-water flow network. The process identifies matching and mismatching lines in each dataset to help focus subsequent validation procedures to areas of the NHD that more critically need updates
Authors
Larry V. Stanislawski, Jeffrey Wendel, Ethan J. Shavers, Ting Li
Thermally induced fracture of macroscale surficial granite sheets
Geologically diverse landforms around the world show indications of energetic macroscale fracture. These fractures are sometimes displayed dramatically as so-called “A-tents”, whereby relatively thin rock sheets push upwards and fracture, forming tent-like voids beneath the ruptured sheets. The origin and formation of such features has been a topic of considerable interest and analysis for over a
Authors
Brian D. Collins, Greg M. Stock, Martha C. Eppes
Interstate water management of a “hidden” resource - Physical principles of groundwater hydrology
Groundwater systems are dynamic geologic environments in which water continuously flows from recharge areas to discharge areas at streams, springs, wetlands, coastal waters, and wells. Natural, predevelopment conditions within groundwater systems are changed by the introduction of wells and other human stresses that modify existing groundwater levels, flow paths, and hydrologic budgets. Groundwate
Authors
Paul M. Barlow
Seismic hazard classifications and Vs30 in Connecticut using MASW and HVSR methods
Five new seismic hazard classifications for Hartford County, Connecticut (CT), were proposed by New England State Geologists (NESG) in an effort to improve the current USGS Seismic Hazard Map. These classes were derived from mapped surficial materials, but in situ information is required to verify this approach. Therefore, active and passive surface wave techniques were performed at thirty field s
Authors
Sarah L C Morton, John W. Lane, Margaret A. Thomas, Lanbo Liu
Probabilistic models of seafloor composition using multispectral acoustic backscatter: The benthic detectorists
We describe and compare two probabilistic models
for task-specific seafloor characterization based on multispectral
backscatter. We examine whether generative or discriminative
approaches to supervised seafloor characterization do better
at harnessing the greatly increased information about seafloor
substrate composition that is encoded in the backscattering
response across multiple frequencies. A
Authors
Daniel Buscombe, Paul E. Grams, Matthew Kaplinski
Characterizing the Los Angeles Aqueduct crossing of the San Andreas Fault for improved earthquake resilience
The five-mile-long Elizabeth Tunnel, which crosses the San Andreas fault (SAF) zone near Lake Hughes, California, is part of the Los Angeles Aqueduct (LAA) that delivers water from Owens Valley to the City of Los Angeles. Geologic characterization of the Elizabeth Tunnel alignment is focused on developing a better understanding of fault displacement hazards at the SAF crossing to support design of
Authors
Scott Lindvall, Scott Kerwin, Chris Heron, Craig A. Davis, Jeff Tyson, Jim Chestnut, Kevin Mass, Mike Farr, Katherine Scharer, Devin McPhillips
The science, engineering applications, and policy implications of simulation-based PSHA
We summarize scientific methods for developing probabilistic seismic hazard assessments from 3-D earthquake ground motion simulations, describe current use of simulated ground motions for engineering applications, and discuss on-going efforts to incorporate these effects in the U.S. national seismic hazard model. The 3-D simulations provide important, additional information about earthquake ground
Authors
Morgan P. Moschetti, Sandra P. Chang, C.B Crouse, Arthur Frankel, Robert Graves, H Puangnak, Nicolas Luco, Christine A. Goulet, Sanaz Rezaeian, Allison Shumway, Peter M. Powers, Mark D. Petersen, Scott Callaghan, T.H. Jordan, Kevin R. Milner
Application of electromagnetic induction to develop a precision irrigation framework to facilitate smallholder dry season farming in the Nasia-Kparigu area of northern Ghana
No abstract available.
Authors
Jeremy M Fontaine, Alexander Percy, Erasmus K Oware, Patience Bosompemaa, Vincent Gbedzi, John W. Lane
A novel technique for precision geometric correction of jitter distortion for the Europa Imaging System and other rolling shutter cameras
We use simulated images to demonstrate a novel technique for mitigating geometric distortions caused by platform motion (“jitter”) as two-dimensional image sensors are exposed and read out line by line (“rolling shutter”). The results indicate that the Europa Imaging System (EIS) on NASA’s Europa Clipper can likely meet its scientific goals requiring 0.1-pixel precision. We are therefore adapting
Authors
Randolph L. Kirk, Makayla Shepherd, Stuart Sides
An interim harvest strategy for Taiga Bean geese
In 2016 the AEWA European Goose Management International Working Group (EGM
IWG) adopted document AEWA/EGM IWG 1.8 (Johnson et al. 2016), which contained initial
elements of an Adaptive Harvest Management programme for Taiga Bean Geese. This report
addresses a number of limitations with the population model presented in that document, and
provides up-to-date population projections for the Central
Authors
Fred A. Johnson, Mikko Alhainen, Anthony D. Fox, Jesper Madsen
Hydraulic tomography: 3D hydraulic conductivity and fracture network connectivity in a contaminated mudstone aquifer
No abstract available.
Authors
Warren Barrash, Claire R. Tiedeman, Colby Thrash, Jeremy Patterson, Carole D. Johnson