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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 more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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CFC tracing of groundwater in fractured rock aided with 14C and 3H to identify water mixing CFC tracing of groundwater in fractured rock aided with 14C and 3H to identify water mixing
No abstract available.
Authors
A.S. Talma, John L. Weaver, L.N. Plummer, Eurybiades Busenberg
Direct measurement of turbulence properties by a BB-ADCP in bottom boundary layer Direct measurement of turbulence properties by a BB-ADCP in bottom boundary layer
No abstract available.
Authors
R. T. Cheng, C. #NAME? Ling, J. W. Gartner
The study of humic substances--In search of a paradigm The study of humic substances--In search of a paradigm
No abstract available.
Authors
Robert L. Wershaw
Volcanism and ice interactions on Earth and Mars Volcanism and ice interactions on Earth and Mars
Volcano/ice interactions produce meltwater. Meltwater can enter the groundwater cycle and under the influence of hydrothermal systems, it can be later discharged to form channels and valleys or cycled upward to melt permafrost. Water or ice-saturated ground can erupt into phreatic craters when covered by lava. Violent mixing of meltwater and volcanic material and rapid release can...
Authors
Mary G. Chapman, Carlton C. Allen, Magnus T. Gudmundsson, Virginia C. Gulick, Sveinn P. Jakobsson, Baerbel K. Lucchitta, Ian P. Skilling, Richard B. Waitt
Modeling surface-subsurface hydrological interactions Modeling surface-subsurface hydrological interactions
No abstract available.
Authors
Aaron I. Packman, Kenneth E. Bencala
Emergent biological patterns and surface-subsurface interactions at landscape scales Emergent biological patterns and surface-subsurface interactions at landscape scales
In this chapter, we focus on emergent biological patterns in riverine ecosystems at landscape scales resulting from surface-subsurface water interaction. Our objectives are to examine (1) how the balance of physical and chemical factors on the "natural" geologic template affects biological patterns, (2) how natural hydrothermal systems can be used as a model for understanding surface...
Authors
C. M. Pringle, F.J. Triska
Nitrate isotopes in groundwater systems Nitrate isotopes in groundwater systems
Nitrate contamination, often associated with agricultural activities, is a major problem in some shallow aquifers and is increasingly becoming a threat to groundwater supplies (Gillham and Cherry, 1978; Ronen et al., 1983; Spalding and Exner, 1991). The intake of high levels of nitrate can cause methemoglobinemia in infants, and there is substantial evidence collected from animal...
Authors
Carol Kendall, Ramon Aravena
Enhanced levels of zinc in drinking water adversely affect spatial learning in rats Enhanced levels of zinc in drinking water adversely affect spatial learning in rats
No abstract available.
Authors
J.M. Flinn, J. Morgan, J. Magaha, L. Krause, K. Navarrete, B.F. Jones
Bird community composition Bird community composition
Neotropical migrants are birds that breed in North America and winter primarily in Central and South America. Long-term population studies of birds in the Eastern United States indicated declines of some forest-dwelling birds, many of which winter in the Neotropics (Peterjohn and others 1995). These declines were attributed to loss of wintering and breeding habitat due to deforestation...
Authors
T. J. Antrobus, M.P. Guilfoyle, W.C. Barrow, P.B. Hamel, J.S. Wakeley
Vegetation and soils Vegetation and soils
haracterization of bottomland hardwood vegetation in relatively undisturbed forests can provide critical information for developing effective wetland creation and restoration techniques and for assessing the impacts of management and development. Classification is a useful technique in characterizing vegetation because it summarizes complex data sets, assists in hypothesis generation...
Authors
M.K. Burke, S.L. King, M.H. Eisenbies, D. Gartner
Vegetation dynamics Vegetation dynamics
A disturbance can be defined as 'any relatively discrete event in time that disrupts ecosystem, community, or population structure and changes resources, substrate availability, or the physical environment' (Pickett and White 1985). Vegetation dynamics are a function of the temporal and spatial patterns of the disturbance regime. Natural disturbance regimes support the highest biological...
Authors
S.L. King, M.K. Burke, T. J. Antrobus, S. Billups