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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U.S. Geological Survey suspended-sediment surrogate research, Part I: Call for a sediment monitoring instrument and analysis research program U.S. Geological Survey suspended-sediment surrogate research, Part I: Call for a sediment monitoring instrument and analysis research program
No abstract available.
Authors
John R. Gray
U.S. Geological Survey suspended-sediment surrogate research, Part II: Optic technologies U.S. Geological Survey suspended-sediment surrogate research, Part II: Optic technologies
No abstract available.
Authors
John R. Gray, Daniel J. Gooding, Theodore S. Melis, David J. Topping, Patrick P. Rasmussen
U.S. Geological Survey suspended-sediment surrogate research, Part III: Acoustic and pressure-differential technologies U.S. Geological Survey suspended-sediment surrogate research, Part III: Acoustic and pressure-differential technologies
No abstract available.
Authors
John R. Gray, Eduardo Patiño, Matthew C. Larsen
US National Large-scale City Orthoimage Standard Initiative US National Large-scale City Orthoimage Standard Initiative
The early procedures and algorithms for National digital orthophoto generation in National Digital Orthophoto Program (NDOP) were based on earlier USGS mapping operations, such as field control, aerotriangulation (derived in the early 1920's), the quarter-quadrangle-centered (3.75 minutes of longitude and latitude in geographic extent), 1:40,000 aerial photographs, and 2.5 D digital...
Authors
G. Zhou, C. Song, S. Benjamin, W. Schickler
Use of input uncertainty and model sensitivity to guide site exploration Use of input uncertainty and model sensitivity to guide site exploration
Three Quantitatively Directed Exploration (QDE) methods to identify optimum field sampling locations based on model input covariance and model sensitivity are presented. The first method bases site exploration only on the spatial variation in the uncertainty of input properties. The second method uses only the spatial variation in model sensitivities. The third method uses a first-order...
Authors
A.J. Graettinger, H. W. Reeves, J. Lee, D. Dethan
Use of microstrip patch antennas in grain and pulverized materials permittivity measurement Use of microstrip patch antennas in grain and pulverized materials permittivity measurement
A free-space microwave system developed for the measurement of the relative complex permittivity of granular materials and of pulverized materials was reported. The system consists of a transmitting antenna and a receiving antenna separated by a space filled by the sample to be characterized and a network analyzer for transmission measurement. The receiving antenna was mounted on a...
Authors
El Sabbagh, O.M. Ramahi, S. Trabelsi, S.O. Nelson, L. Khan
Use of microstrip patch antennas in grain permittivity measurement Use of microstrip patch antennas in grain permittivity measurement
In this paper, a compact size free-space setup is proposed for the measurement of complex permittivity of granular materials. The horn antennas in the conventional setup are replaced by microstrip patch antennas which is a step toward system miniaturization. The experimental results obtained are in good agreement with those obtained with horn antennas.
Authors
El Sabbagh, O.M. Ramahi, S. Trabelsi, S.O. Nelson, L. Khan
Use of the Legal-Institutional Analysis Model to assess hydropower licensing negotiations Use of the Legal-Institutional Analysis Model to assess hydropower licensing negotiations
In the United States, the Federal Energy Regulatory Commission (FERC) is responsible for issuing or renewing licenses for hydropower projects owned and operated by power companies. During the licensing process, these companies are required to consult with agencies and other parties that are affected by project operating regimes. Typical participants include state and federal fish and...
Authors
N. Burkardt, B. L. Lamb
USGS Alaska Tissue Archival Projects: An update on FY02 activities USGS Alaska Tissue Archival Projects: An update on FY02 activities
The banking of environmental specimens under cryogenic conditions for future retrospective analysis has been recognized for many years as an important part of environmental monitoring programs. Since 1987, the Alaska Marine Mammal Tissue Archival Project (AMMTAP) has been collecting tissue samples from marine mammals for archival in the National Biomonitoring Specimen Bank (NBSB) at the...
Authors
Geoff Weston-York
USGS overview of research activities for evaluating uncertainty USGS overview of research activities for evaluating uncertainty
No abstract available.
Authors
Mary C. Hill, George H. Leavesley
Using a 1200 kHz workhorse ADCP with mode 12 to measure near bottom mean currents Using a 1200 kHz workhorse ADCP with mode 12 to measure near bottom mean currents
Using high frequency Acoustic Doppler Current (ADCP) profiling technology, it is possible to make high-resolution measurements of mean current profiles within a few meters of the seabed. In coastal applications, mean current speeds may be 10 cm/s or less, and oscillatory wave currents may exceed 100 cm/s during storm events. To resolve mean flows of 10 cm/s or less under these conditions
Authors
M. Martini
Using noble gases to investigate mountain-front recharge Using noble gases to investigate mountain-front recharge
Mountain-front recharge is a major component of recharge to inter-mountain basin-fill aquifers. The two components of mountain-front recharge are (1) subsurface inflow from the mountain block (subsurface inflow), and (2) infiltration from perennial and ephemeral streams near the mountain front (stream seepage). The magnitude of subsurface inflow is of central importance in source...
Authors
A. H. Manning, D. K. Solomon