Sources of variation in survival of breeding female wood ducks
Kevin M. Hartke, J.B. Grand, Gary R. Hepp, T.H. Folk
2006, Condor (108) 201-210
In waterfowl, reproduction is physiologically demanding and females are exposed to varying risks of mortality at different periods of the breeding cycle. Moreover, differences among females may influence survival within breeding periods. We captured and fitted female Wood Ducks (Aix sponsa) with radio-transmitters before nest initiation during two breeding seasons...
Altitude and configuration of the potentiometric surface in East Nottingham and West Nottingham Townships, Chester County, Pennsylvania, April through June 2004
Lindsay B. Hale
2006, Scientific Investigations Map 2911
Since 1984, the U.S. Geological Survey (USGS) has been mapping the altitude and configuration of the potentiometric surface in Chester County as part of an ongoing cooperative program to measure and describe the water resources of the county. Areas where the potentiometric surface has been mapped are shown on figure...
The allometric relationship between resting metabolic rate and body mass in wild waterfowl (Anatidae) and an application to estimation of winter habitat requirements
M. R. Miller, J. McA Eadie
2006, Condor (108) 166-177
We examined the allometric relationship between resting metabolic rate (RMR; kJ day-1) and body mass (kg) in wild waterfowl (Anatidae) by regressing RMR on body mass using species means from data obtained from published literature (18 sources, 54 measurements, 24 species; all data from captive birds). There was no significant...
Estimating hydraulic properties using a moving-model approach and multiple aquifer tests
K. J. Halford, D. Yobbi
2006, Ground Water (44) 284-291
A new method was developed for characterizing geohydrologic columns that extended >600 m deep at sites with as many as six discrete aquifers. This method was applied at 12 sites within the Southwest Florida Water Management District. Sites typically were equipped with multiple production wells, one for each aquifer and...
Aqueous processes at Gusev crater inferred from physical properties of rocks and soils along the Spirit traverse
N.A. Cabrol, J.D. Farmer, E.A. Grin, L. Ritcher, L. Soderblom, R. Li, Kenneth E. Herkenhoff, G. A. Landis, R. E. Arvidson
2006, Journal of Geophysical Research E: Planets (111)
Gusev crater was selected as the landing site for Spirit on the basis of morphological evidence of long-lasting water activity, including possibly fluvial and lacustrine episodes. From the Columbia Memorial Station to the Columbia Hills, Spirit's traverse provides a journey back in time, from relatively recent volcanic plains showing little...
Sediment phosphate composition in relation to emergent macrophytes in the Doñana Marshes (SW Spain)
M. Reina, J. L. Espinar, L. Serrano
2006, Water Research (40) 1185-1190
We have studied the effect of the presence of emergent macrophytes on the sediment phosphate composition of a eutrophic shallow marsh on the NE margin of Doñana (SW Spain). Top sediment and water samples were collected from both the open-water and the vegetated sites at three areas covered by different...
Estimating recharge rates with analytic element models and parameter estimation
W. R. Dripps, R. J. Hunt, Marilyn P. Anderson
2006, Ground Water (44) 47-55
Quantifying the spatial and temporal distribution of recharge is usually a prerequisite for effective ground water flow modeling. In this study, an analytic element (AE) code (GFLOW) was used with a nonlinear parameter estimation code (UCODE) to quantify the spatial and temporal distribution of recharge using measured base flows as...
Resolving structural influences on water-retention properties of alluvial deposits
K.A. Winfield, J. R. Nimmo, J. A. Izbicki, P. M. Martin
2006, Vadose Zone Journal (5) 706-719
With the goal of improving property-transfer model (PTM) predictions of unsaturated hydraulic properties, we investigated the influence of sedimentary structure, defined as particle arrangement during deposition, on laboratory-measured water retention (water content vs. potential [θ(ψ)]) of 10 undisturbed core samples from alluvial deposits in the western Mojave Desert, California. The...
Effect of reduced winter precipitation and increased temperature on watershed solute flux, 1988-2002, Northern Michigan
R. Stottlemyer, D. Toczydlowski
2006, Biogeochemistry (77) 409-440
Since 1987 we have studied weekly change in winter (December-April) precipitation, snowpack, snowmelt, soil water, and stream water solute flux in a small (176-ha) Northern Michigan watershed vegetated by 65-85 year-old northern hardwoods. Our primary study objective was to quantify the effect of change in winter temperature and precipitation on...
The role of sandstone in the development of an Ozark karst system, south-central Missouri
R. C. Orndorff, D. J. Weary, R.W. Harrison
2006, Special Paper of the Geological Society of America 31-38
Cave, spring, and sinkhole development in the Ozarks of south-central Missouri is placed in a geologic framework through detailed geologic mapping. Geologic mapping shows that initial dissolution and inception of cave development is concentrated just beneath sandstone beds within Upper Cambrian and Lower Ordovician dolostone. Although rocks of the Ozarks...
Water-quality characteristics and contaminants in the rural karst-dominated Spring Mill Lake watershed, southern Indiana
N.R. Hasenmueller, M.A. Buehler, N.C. Krothe, J.B. Comer, T.D. Branam, M.V. Ennis, R.T. Smith, D.D. Zamani, L. Hahn, J.P. Rybarczyk
2006, Special Paper of the Geological Society of America 153-167
The Spring Mill Lake watershed is located in the Mitchell Plateau, a karst area that developed on Mississippian carbonates in southern Indiana. Spring Mill Lake is a reservoir built in the late 1930s and is located in Spring Mill State Park. Within the park, groundwater from subsurface conduits issues as...
Reconstructing depositional processes and history from reservoir stratigraphy: Englebright Lake, Yuba River, northern California
N.P. Snyder, S.A. Wright, Charles N. Alpers, L. E. Flint, C. W. Holmes, D. M. Rubin
2006, Journal of Geophysical Research F: Earth Surface (111)
Reservoirs provide the opportunity to link watershed history with its stratigraphic record. We analyze sediment cores from a northern California reservoir in the context of hydrologic history, watershed management, and depositional processes. Observations of recent depositional patterns, sediment‐transport calculations, and 137Cs geochronology support a conceptual model in which the reservoir delta...
Possible linkages between lignite aquifers, pathogenic microbes, and renal pelvic cancer in northwestern Louisiana, USA
J.E. Bunnell, C. A. Tatu, R.N. Bushon, D. M. Stoeckel, A.M.G. Brady, M. Beck, H.E. Lerch, B. McGee, B.C. Hanson, R. Shi, W. H. Orem
2006, Environmental Geochemistry and Health (28) 577-587
In May and September, 2002, 14 private residential drinking water wells, one dewatering well at a lignite mine, eight surface water sites, and lignite from an active coal mine were sampled in five Parishes of northwestern Louisiana, USA. Using a geographic information system (GIS), wells were selected that were likely...
A survey of chemical constituents in National Fish Hatchery fish feed
Alec G. Maule, Ann Gannam, Jay Davis
2006, Report
Recent studies have demonstrated that various fish feeds contain significant concentrations of contaminants, many of which can bioaccumulate and bioconcentrate in fish. It appears that numerous organochlorine (OC) contaminants are present in the fish oils and fish meals used in feed manufacture, and some researchers speculate that all fish feeds...
Evaluation of eelgrass beds mapping using a high-resolution airborne multispectral scanner
H. Su, D. Karna, E. Fraim, M. Fitzgerald, J. S. Myers, R. Dominguez, B. Coffland, Lawrence R. Handley, T. Mace
2006, Photogrammetric Engineering and Remote Sensing (72) 789-797
Eelgrass (Zostera marina) can provide vital ecological functions in stabilizing sediments, influencing current dynamics, and contributing significant amounts of biomass to numerous food webs in coastal ecosystems. Mapping eelgrass beds is important for coastal water and nearshore estuarine monitoring, management, and planning. This study demonstrated the possible use of high...
Longitudinal hydraulic analysis of river‐aquifer exchanges
C.P. Konrad
2006, Water Resources Research (42)
A longitudinal analysis of transient flow between a river and an underlying aquifer is developed to calculate flow rates between the river and the aquifer and the location of groundwater seepage into the river as it changes over time. Two flow domains are defined in the analysis: an upstream domain...
Increasing streamflow and baseflow in Mississippi River since the 1940 s: Effect of land use change
Y.-K. Zhang, K. E. Schilling
2006, Journal of Hydrology (324) 412-422
A trend of increasing streamflow has been observed in the Mississippi River (MR) basin since the 1940 s as a result of increased precipitation. Herein we show that increasing MR flow is mainly in its baseflow as a result of land use change and accompanying agricultural activities that occurred in...
Users' manual for the Hydroecological Integrity Assessment Process software (including the New Jersey Assessment Tools)
James A. Henriksen, John Heasley, Jonathan G. Kennen, Steven Nieswand
2006, Open-File Report 2006-1093
This manual is a user’s guide to four computer software tools that have been developed for the Hydroecological Integrity Assessment Process. The Hydroecological Integrity Assessment Process recognizes that streamflow is strongly related to many critical physiochemical components of rivers, such as dissolved oxygen, channel geomorphology, and water temperature, and can...
Use of borehole radar reflection logging to monitor steam-enhanced remediation in fractured limestone--Results of numerical modelling and a field experiment
C. Gregoire, P. K. Joesten, J.W. Lane Jr.
2006, Journal of Applied Geophysics (60) 41-54
Ground penetrating radar is an efficient geophysical method for the detection and location of fractures and fracture zones in electrically resistive rocks. In this study, the use of down-hole (borehole) radar reflection logs to monitor the injection of steam in fractured rocks was tested as part of a field-scale, steam-enhanced...
Modeling effects of multinode wells on solute transport
Leonard F. Konikow, G.Z. Hornberger
2006, Ground Water (44) 648-660
Long-screen wells or long open boreholes with intraborehole flow potentially provide pathways for contaminants to move from one location to another in a ground water flow system. Such wells also can perturb a flow field so that the well will not provide water samples that are representative of ground water...
Mountain hydrology of the western United States
Roger C. Bales, Noah P. Molotch, Thomas H. Painter, Michael D. Dettinger, Robert Rice, Jeff Dozier
2006, Water Resources Research (42)
Climate change and climate variability, population growth, and land use change drive the need for new hydrologic knowledge and understanding. In the mountainous West and other similar areas worldwide, three pressing hydrologic needs stand out: first, to better understand the processes controlling the partitioning of energy and water fluxes within...
Role of transient water pressure in quarrying: A subglacial experiment using acoustic emissions
D. Cohen, T.S. Hooyer, N.R. Iverson, J.F. Thomason, M. Jackson
2006, Journal of Geophysical Research F: Earth Surface (111)
Probably the most important mechanism of glacial erosion is quarrying: the growth and coalescence of cracks in subglacial bedrock and dislodgement of resultant rock fragments. Although evidence indicates that erosion rates depend on sliding speed, rates of crack growth in bedrock may be enhanced by changing stresses on the bed...
Determining anisotropic transmissivity using a simplified Papadopulos method
V.M. Heilweil, P. A. Hsieh
2006, Ground Water (44) 749-753
The straight-line method presented by Papadopulos requires a minimum of three observation wells for determining the transmissivity tensor of a homogeneous and anisotropic aquifer. A simplification of this method was developed for fractured aquifers where the principal directions of the transmissivity tensor are known prior to implementation, such as when...
Multiphase, multicomponent parameter estimation for liquid and vapor fluxes in deep arid systems using hydrologic data and natural environmental tracers
Edward M. Kwicklis, Andrew V. Wolfsberg, Philip H. Stauffer, Michelle Ann Walvoord, Michael J. Sully
2006, Vadose Zone Journal (5) 934-950
Multiphase, multicomponent numerical models of long-term unsaturated-zone liquid and vapor movement were created for a thick alluvial basin at the Nevada Test Site to predict present-day liquid and vapor fluxes. The numerical models are based on recently developed conceptual models of unsaturated-zone moisture movement in thick alluvium that explain present-day...
Phosphate oxygen isotope ratios as a tracer for sources and cycling of phosphate in North San Francisco Bay, California
K. McLaughlin, C. Kendall, S. R. Silva, M. Young, A. Paytan
2006, Journal of Geophysical Research G: Biogeosciences (111)
[1] A seasonal analysis assesing variations in the oxygen isotopic composition of dissolved inorganic phosphate (DIP) was conducted in the San Francisco Bay estuarine system, California. Isotopic fractionation of oxygen in DIP (exchange of oxygen between phosphate and environmental water) at surface water temperatures occurs only as...
