Bryophytes from Simeonof Island in the Shumagin Islands, southwestern Alaska
Wilfred B. Schofield, Stephen S. Talbot, Sandra L. Talbot
2004, Journal of the Hattori Botanical Laboratory (95) 155-198
Simeonof Island is located south of the Alaska Peninsula in the hyperoceanic sector of the middle boreal subzone. We examined the bryoflora of Simeonof Island to determine species composition in an area where no previous collections had been reported. This field study was conducted in sites selected to represent the...
Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model
E.L. Usery, M.P. Finn, Daniel J. Scheidt, S. Ruhl, T. Beard, M. Bearden
2004, Journal of Geographical Systems (6) 289-306
Researchers have been coupling geographic information systems (GIS) data handling and processing capability to watershed and waterquality models for many years. This capability is suited for the development of databases appropriate for water modeling. However, it is rare for GIS to provide direct inputs to the models. To demonstrate the...
Linear model describing three components of flow in karst aquifers using 18O data
Andrew J. Long, L.D. Putnam
2004, Journal of Hydrology (296) 254-270
The stable isotope of oxygen, 18O, is used as a naturally occurring ground-water tracer. Time-series data for ??18O are analyzed to model the distinct responses and relative proportions of the conduit, intermediate, and diffuse flow components in karst aquifers. This analysis also describes mathematically the dynamics of the transient fluid...
A review of models and micrometeorological methods used to estimate wetland evapotranspiration
J.Z. Drexler, R.L. Snyder, D. Spano, U.K.T. Paw
2004, Hydrological Processes (18) 2071-2101
Within the past decade or so, the accuracy of evapotranspiration (ET) estimates has improved due to new and increasingly sophisticated methods. Yet despite a plethora of choices concerning methods, estimation of wetland ET remains insufficiently characterized due to the complexity of surface characteristics and the diversity of wetland types. In...
Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model
W. E. Sanford, Niel Plummer, D. P. McAda, L. M. Bexfield, S. K. Anderholm
2004, Hydrogeology Journal (12) 389-407
The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow...
Pesticides in surface water runoff in south-eastern New York State, USA: Seasonal and stormflow effects on concentrations
P. J. Phillips, R.W. Bode
2004, Conference Paper, Pest Management Science
Samples from two streams (Kisco River and the Middle Branch of the Croton River) in the Croton Reservoir system in south-eastern New York State, USA were sampled from May 2000 through to February 2001 in order to document the effect of land use, streamflow and seasonal patterns of application on...
Drainage effects on stream nitrate-N and hydrology in south-central Minnesota (USA)
J.A. Magner, G. A. Payne, J. Steffen
2004, Environmental Monitoring and Assessment (91) 183-198
Excessive nitrate-N in south-central Minnesota ditches and streams is related to land-use change, and may be contributing to the development of the zone of hypoxia in the Gulf of Mexico. Intensive land-use (agricultural management) has progressively increased as subsurface drainage has improved crop productivity over the past 25 years. We...
Elastic velocities of partially gas-saturated unconsolidated sediments
Myung W. Lee
2004, Marine and Petroleum Geology (21) 641-650
Fluid in sediments significantly affects elastic properties of sediments and gas in the pore space can be identified by a marked reduction of P-wave velocity or a decrease of Poisson's ratio. The elastic properties of gas-saturated sediments can be predicted by the classical Biot-Gassmann theory (BGT). However, parameters for the...
The impact of anthropogenic land-cover change on the Florida Peninsula Sea Breezes and warm season sensible weather
C. H. Marshall, R.A. Pielke Sr., L. T. Steyaert, Debra A. Willard
2004, Monthly Weather Review (132) 28-52
During the twentieth century, the natural landscape of the Florida peninsula was transformed extensively by agriculture, urbanization, and the diversion of surface water features. The purpose of this paper is to present a numerical modeling study in which the possible impacts of this transformation on the warm season climate of...
The Schaake shuffle: A method for reconstructing space-time variability in forecasted precipitation and temperature fields
M.R. Clark, S. Gangopadhyay, L. Hay, B. Rajagopalan, R. Wilby
2004, Journal of Hydrometeorology (5) 243-262
A number of statistical methods that are used to provide local-scale ensemble forecasts of precipitation and temperature do not contain realistic spatial covariability between neighboring stations or realistic temporal persistence for subsequent forecast lead times. To demonstrate this point, output from a global-scale numerical weather prediction model is used in...
Forecasting vegetation greenness with satellite and climate data
Lei Ji, Albert J. Peters
2004, IEEE Geoscience and Remote Sensing Letters (1) 3-6
A new and unique vegetation greenness forecast (VGF) model was designed to predict future vegetation conditions to three months through the use of current and historical climate data and satellite imagery. The VGF model is implemented through a seasonality-adjusted autoregressive distributed-lag function, based on our finding that the normalized difference...
Ground-water pumpage and artificial recharge estimates for calendar year 2000 and average annual natural recharge and interbasin flow by hydrographic area, Nevada
Thomas J. Lopes, David M. Evetts
2004, Scientific Investigations Report 2004-5239
Nevada's reliance on ground-water resources has increased because of increased development and surface-water resources being fully appropriated. The need to accurately quantify Nevada's water resources and water use is more critical than ever to meet future demands. Estimated ground-water pumpage, artificial and natural recharge, and interbasin flow can be used...
Using satellite radiotelemetry data to delineate and manage wildlife populations
Steven C. Amstrup, T. L. McDonald, George M. Durner
2004, Wildlife Society Bulletin (32) 661-679
The greatest promise of radiotelemetry always has been a better understanding of animal movements. Telemetry has helped us know when animals are active, how active they are, how far and how fast they move, the geographic areas they occupy, and whether individuals vary in these traits. Unfortunately, the inability to...
A method for evaluating the importance of system state observations to model predictions, with application to the Death Valley regional groundwater flow system
Claire R. Tiedeman, D. Matthew Ely, Mary C. Hill, Grady M. O’Brien
2004, Water Resources Research (40)
We develop a new observation‐prediction (OPR) statistic for evaluating the importance of system state observations to model predictions. The OPR statistic measures the change in prediction uncertainty produced when an observation is added to or removed from an existing monitoring network, and it can be used to guide refinement and...
Edwards plateau: Analysis of land cover trends
B.A. Friesen, D.J. Hester, K.A. Casey
2004, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
The Land Cover Trends project studies the rates, causes, and consequences of contemporary (1973-2000) change in land use and land cover in the United States on an ecoregional basis. The Edwards Plateau ecoregion is the focus of this report. Landsat imagery from five dates during a nearly 30-year period are...
The Coso geothermal area: A laboratory for advanced MEQ studies for geothermal monitoring
B.R. Julian, G.R. Foulger, K. Richards-Dinger
2004, Conference Paper, Geothermal Resources Council Transactions
The permanent 16-station network of three-component digital seismometers at the Coso geothermal area, California, supplemented by 14 temporary instruments deployed in connection with the DOE Enhanced Geothermal Systems (EGS) Project, provides high-quality microearthquake (MEQ) recordings that are well suited to monitoring a producing geothermal area. We are currently using these...
Application of SAXS and SANS in evaluation of porosity, pore size distribution and surface area of coal
A. P. Radlinski, Maria Mastalerz, A.L. Hinde, M. Hainbuchner, H. Rauch, M. Baron, J.S. Lin, L. Fan, P. Thiyagarajan
2004, International Journal of Coal Geology (59) 245-271
This paper discusses the applicability of small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS) techniques for determining the porosity, pore size distribution and internal specific surface area in coals. The method is noninvasive, fast, inexpensive and does not require complex sample preparation. It uses coal grains of...
Standard penetration test-based probabilistic and deterministic assessment of seismic soil liquefaction potential
K.O. Cetin, R.B. Seed, A. Der Kiureghian, K. Tokimatsu, L.F. Harder Jr., R. E. Kayen, R.E.S. Moss
2004, Journal of Geotechnical and Geoenvironmental Engineering (130) 1314-1340
This paper presents'new correlations for assessment of the likelihood of initiation (or triggering) of soil liquefaction. These new correlations eliminate several sources of bias intrinsic to previous, similar correlations, and provide greatly reduced overall uncertainty and variance. Key elements in the development of these new correlations are (1) accumulation of...
Modes of occurrence of mercury and other trace elements in coals from the warrior field, Black Warrior Basin, Northwestern Alabama
S. F. Diehl, M. B. Goldhaber, J. R. Hatch
2004, International Journal of Coal Geology (59) 193-208
The mineralogic residence and abundance of trace metals is an important environmental issue. Data from the USGS coal quality database show that potentially toxic elements, including Hg, As, Mo, Se, Cu, and Tl are enriched in a subset of coal samples in the Black Warrior Basin of Alabama, USA. Although...
A project summary: Water and energy budget assessment for a non-tidal wetland in the Sacramento-San Joaquin delta
Frank E. Anderson, R.L. Snyder, U.K.T. Paw, Judith Z. Drexler
2004, Conference Paper, 26th Conference on Agricultural and Forest Meteorology
The methods used to obtain universal cover coefficient (Kc) values for a non-tidal restored wetland in the Sacramento-San Joaquin river delta, US, during the summer of the year 2002 and to investigate possible differences during changing wind patterns are described. A micrometeorological tower over the wetland was established to quantify...
Strontium isotopic signatures of oil-field waters: Applications for reservoir characterization
R.J. Barnaby, G.C. Oetting, G. Gao
2004, American Association of Petroleum Geologists Bulletin (88) 1677-1704
The 87Sr/86Sr compositions of formation waters that were collected from 71 wells producing from a Pennsylvanian carbonate reservoir in New Mexico display a well-defined distribution, with radiogenic waters (up to 0.710129) at the updip western part of the reservoir, grading downdip to less radiogenic waters (as low as 0.708903 to...
3D near-to-surface conductivity reconstruction by inversion of VETEM data using the distorted Born iterative method
G.L. Wang, W.C. Chew, T.J. Cui, A.A. Aydiner, D.L. Wright, D.V. Smith
2004, Inverse Problems (20)
Three-dimensional (3D) subsurface imaging by using inversion of data obtained from the very early time electromagnetic system (VETEM) was discussed. The study was carried out by using the distorted Born iterative method to match the internal nonlinear property of the 3D inversion problem. The forward solver was based on the...
Allegheny woodrat (Neotoma magister) use of rock drainage channels on reclaimed mines in southern West Virginia
H.D. Chamblin, P.B. Wood, J.W. Edwards
2004, American Midland Naturalist (151) 346-354
Allegheny woodrats (Neotoma magister) currently receive protected status throughout their range due to population declines. Threats associated with habitat fragmentation (e.g., introduced predators, disease, loss of connectivity among subpopulations and habitat loss) may explain why Allegheny woodrats are no longer found in many areas where they existed just 25 y...
In-flight validation and recovery of water surface temperature with Landsat-5 thermal infrared data using an automated high-altitude lake validation site at Lake Tahoe
S.J. Hook, G. Chander, J. A. Barsi, R.E. Alley, A. Abtahi, Frank Don Palluconi, B. L. Markham, R.C. Richards, S.G. Schladow, D. L. Helder
2004, IEEE Transactions on Geoscience and Remote Sensing (42) 2767-2776
The absolute radiometric accuracy of the thermal infrared band (B6) of the Thematic Mapper (TM) instrument on the Landsat-5 (L5) satellite was assessed over a period of approximately four years using data from the Lake Tahoe automated validation site (California-Nevada). The Lake Tahoe site was established in July 1999, and...
The Cottage Grove fault system (Illinois Basin): Late Paleozoic transpression along a Precambrian crustal boundary
A.B. Duchek, J.H. McBride, W.J. Nelson, H.E. Leetaru
2004, Geological Society of America Bulletin (116) 1465-1484
The Cottage Grove fault system in southern Illinois has long been interpreted as an intracratonic dextral strike-slip fault system. We investigated its structural geometry and kinematics in detail using (1) outcrop data, (2) extensive exposures in underground coal mines, (3) abundant borehole data, and (4) a network of industry seismic...
