Publications
This list of Water Resources Mission Area publications includes both official USGS publications and journal articles authored by our scientists. A searchable database of all USGS publications can be accessed at the USGS Publications Warehouse.
Filter Total Items: 18490
Determination of the δ34S of Total Sulfur in Solids: RSIL Lab Code 1800
The purpose of Reston Stable Isotope Laboratory Lab (RSIL) Code 1800 is to determine the δ(34S/32S), abbreviated as δ34S, of total sulfur in a solid sample. A Carlo Erba NC 2500 elemental analyzer (EA) is used to convert total sulfur in a solid sample into SO2 gas. The EA is connected to a continuous flow isotope-ratio mass spectrometer (CF-IRMS), which determines the relative difference in stable
Authors
Kinga Revesz, Tyler B. Coplen
Modeling spatial and temporal variations in temperature and salinity during stratification and overturn in Dexter Pit Lake, Tuscarora, Nevada, USA
This paper examines the seasonal cycling of temperature and salinity in Dexter pit lake in arid northern Nevada, and describes an approach for modeling the physical processes that operate in such systems. The pit lake contains about 596,200 m3 of dilute, near neutral (pHs 6.7–9) water. Profiles of temperature, conductivity, and selected element concentrations were measured almost monthly during 19
Authors
Laurie S. Balistrieri, R.N. Tempel, L.L. Stillings, L.A. Shevenell
Evaluating hydraulic conductivity of desert soils at the Amargosa Desert Research Site near Beatty, Nevada
No abstract available.
Authors
J.W. Wilson
Tracermodel1- Excel workbook for calculation and presentation of environmental tracer data for simple groundwater mixtures: Use of chlorofluorocarbons in hydrology - a guidebook; Section III.10.3
Atmospheric environmental tracers commonly used to date groundwater on timescales of years to decades include CFC-11, CFC-12, CFC-113, SF6, 85Kr, 3 H and 3 H/3 H0 , where 3 H0 refers to initial tritium (3 H + tritiogenic 3 He) (Cook and Herczeg, 2000). Interpretation of age from environmental tracer data may be relatively simple for a water sample with a single age, but the interpretation is more
Authors
John K. Böhlke
Stable isotopic composition of chlorine and oxygen in synthetic and natural perchlorate
No abstract available.
Authors
Neil C. Sturchio, John K. Böhlke, Baohua Gu, Juske Horita, Gilbert M. Brown, Abelardo D. Beloso, Leslie J. Patterson, Paul B. Hatzinger, W. Andrew Jackson, Jacimaria Batista
Flow convergence caused by a salinity minimum in a tidal channel
Residence times of dissolved substances and sedimentation rates in tidal channels are affected by residual (tidally averaged) circulation patterns. One influence on these circulation patterns is the longitudinal density gradient. In most estuaries the longitudinal density gradient typically maintains a constant direction. However, a junction of tidal channels can create a local reversal (change in
Authors
John C. Warner, David H. Schoellhamer, Jon R. Burau, S. Geoffrey Schladow
Side channel mapping and fish habitat suitability analysis using LIDAR topography and orthophotography
No abstract available.
Authors
J. L. Jones
Trophic structure and avian communities across a salinity gradient in evaporation ponds of the San Francisco Bay estuary
Commercial salt evaporation ponds comprise a large proportion of baylands adjacent to the San Francisco Bay, a highly urbanized estuary. In the past two centuries, more than 79% of the historic tidal wetlands in this estuary have been lost. Resource management agencies have acquired more than 10 000 ha of commercial salt ponds with plans to undertake one of the largest wetland restoration projects
Authors
John Y. Takekawa, A.K. Miles, D. H. Schoellhamer, N.D. Athearn, M. K. Saiki, W.D. Duffy, S. Kleinschmidt, G.G. Shellenbarger, C.A. Jannusch
Changes in the timing of winter-spring streamflows in eastern North America, 1913-2002
Changes in the timing and magnitude of winter-spring streamflows were analyzed for gaging stations in eastern North America north of 41?? north latitude during various periods through 2002. Approximately 32 percent of stations north of 44?? have significantly earlier flows over the 50, 60, 70, and 90 year periods; 64 percent have significantly earlier flows over the 80 year period; there are no st
Authors
G.A. Hodgkins, R. W. Dudley
Changes in late-winter snowpack depth, water equivalent, and density in Maine, 1926-2004
Twenty-three snow-course sites in and near Maine, USA, with records spanning at least 50 years through to 2004 were tested for changes over time in snowpack depth, water equivalent, and density in March and April. Of the 23 sites, 18 had a significant decrease (Mann-Kendall test, p < 0??1) in snowpack depth or a significant increase in snowpack density over time. Data from four sites in the mounta
Authors
G.A. Hodgkins, R. W. Dudley
Three-dimensional model for multi-component reactive transport with variable density groundwater flow
PHWAT is a new model that couples a geochemical reaction model (PHREEQC-2) with a density-dependent groundwater flow and solute transport model (SEAWAT) using the split-operator approach. PHWAT was developed to simulate multi-component reactive transport in variable density groundwater flow. Fluid density in PHWAT depends not on only the concentration of a single species as in SEAWAT, but also the
Authors
X. Mao, H. Prommer, D.A. Barry, C.D. Langevin, B. Panteleit, L. Li
Evaluation of the factors controlling the time-dependent inactivation rate coefficients of bacteriophage MS2 and PRD1
Static and dynamic batch experiments were conducted to study the effects of temperature and the presence of sand on the inactivation of bacteriophage MS2 and PRD1. The experimental data suggested that the inactivation process can be satisfactorily represented by a pseudo-first-order expression with time-dependent rate coefficients. The time-dependent rate coefficients were used to determine pertin
Authors
R. Anders, C.V. Chrysikopoulos