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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Evaluation of gridded snow water equivalent and satellite snow cover products for mountain basins in a hydrologic model
The USGS precipitation-runoff modelling system (PRMS) hydrologic model was used to evaluate experimental, gridded, 1 km2 snow-covered area (SCA) and snow water equivalent (SWE) products for two headwater basins within the Rio Grande (i.e. upper Rio Grande River basin) and Salt River (i.e. Black River basin) drainages in the southwestern USA. The SCA product was the fraction of each 1 km2 pixel cov
Authors
K.A. Dressler, G.H. Leavesley, R.C. Bales, S.R. Fassnacht
Evaluation of multilayered pavement structures from measurements of surface waves
A method is presented for evaluating the thickness and stiffness of multilayered pavement structures from guided waves measured at the surface. Data is collected with a light hammer as the source and an accelerometer as receiver, generating a synthetic receiver array. The top layer properties are evaluated with a Lamb wave analysis. Multiple layers are evaluated by matching a theoretical phase vel
Authors
N. Ryden, M.J.S. Lowe, P. Cawley, C.B. Park
Evidence for ground-water stratification near Yucca Mountain, Nevada
Major- and trace-element concentrations and strontium isotope ratios (strontium-87/strontium-86) in samples of ground water potentially can be useful in delineating flow paths in the complex ground-water system in the vicinity of Yucca Mountain, Nevada. Water samples were collected from boreholes to characterize the lateral and vertical variability in the composition of water in the saturated zone
Authors
K. Futa, B.D. Marshall, Z. E. Peterman
Exhumation of Greater Himalayan rock along the main central thrust in Nepal: Implications for channel flow
South-vergent channel flow from beneath the Tibetan Plateau may have played an important role in forming the Himalaya. The possibility that Greater Himalayan rocks currently exposed in the Himalayan Fold-Thrust Belt flowed at mid-crustal depths before being exhumed is intriguing, and may suggest a natural link between orogenic processes operating under the Tibetan Plateau and in the fold-thrust be
Authors
D.M. Robinson, O.N. Pearson
Far-field effects of early Tertiary ridge subduction in Alaska
No abstract available.
Authors
D. C. Bradley, R.M. Friedman, P.W. Layer, Peter J. Haeussler, A. B. Till, S. M. Roeske, Marti L. Miller
Fens and floodplains of the temperate zone: Present status, threats, conservation and restoration
This Special Feature focuses on lowland fens and flood plains. In this introduction we discuss the most important mire-related terms, present status, threats and conservation and restoration attempts. Floodplains and especially lowland fens are rare and vulnerable ecosystems. They are highly threatened all over the world because of direct conversion to agricultural land and especially the lack of
Authors
R. Van Diggelen, B. Middleton, J. Bakker, A. Grootjans, M. Wassen
Field investigation of the drift shadow
The "Drift Shadow" is defined as the relatively drier region that forms below subsurface cavities or drifts in unsaturated rock. Its existence has been predicted through analytical and numerical models of unsaturated flow. However, these theoretical predictions have not been demonstrated empirically to date. In this project we plan to test the drift shadow concept through field investigations and
Authors
G.W. Su, T.J. Kneafsey, T.A. Ghezzehei, P.J. Cook, B.D. Marshall
Field tests of acoustic telemetry for a portable coastal observatory
Long-term field tests of a low-cost acoustic telemetry system were carried out at two sites in Massachusetts Bay. At each site, an acoustic Doppler current profiler mounted on a bottom tripod was fitted with an acoustic modem to transmit data to a surface buoy; electronics mounted on the buoy relayed these data to shore via radio modem. The mooring at one site (24 m water depth) was custom-designe
Authors
M. Martini, B. Butman, J. Ware, D. Frye
Foraging behavior of redheads (Aythya americana) wintering in Texas and Louisiana
Redheads, Aythya americana, concentrate in large numbers annually in traditional wintering areas along the western and northern rim of the Gulf of Mexico. Two of these areas are the Laguna Madre of Texas and Chandeleur Sound of Louisiana. We collected data on 54,340 activities from 103 redhead flocks in Texas and 51,650 activities from 57 redhead flocks in Louisiana. Males and females fed similarl
Authors
M.C. Woodin, T.C. Michot
Forecasting runout of rock and debris avalanches
Physically based mathematical models and statistically based empirical equations each may provide useful means of forecasting runout of rock and debris avalanches. This paper compares the foundations, strengths, and limitations of a physically based model and a statistically based forecasting method, both of which were developed to predict runout across three-dimensional topography. The chief adva
Authors
Richard M. Iverson
Foreword: Climate-disturbance interactions in boreal forest ecosystems
[No abstract available]
Authors
A. D. McGuire, M. Apps
Foreword: Understanding through modeling
[No abstract available]
Authors
C. Zheng, E. Poeter, M. Hill, J. Doherty