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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U. S. G. S. MODULAR GROUND-WATER FLOW MODEL: DESIGNED TO BE UNDERSTOOD AND ADAPTED.
The paper discusses a carefully designed model program and its complementary complete description of all of the physical and mathematical concepts used in the model. The model program consists of a series of independent subroutines called modules. Modules are grouped by hydrologic function into 'packages. ' A report describing the model was written in three levels. At one level the hydrologic conc
Authors
Michael G. McDonald, Arlen W. Harbaugh
URBAN STORMWATER INVESTIGATIONS BY THE U. S. GEOLOGICAL SURVEY.
Urban stormwater hydrology studies in the U. S. Geological Survey are currently focused on compilation of national data bases containing flood-peak and short time-interval rainfall, discharge and water-quality information for urban watersheds. Current data bases, updated annually, are nationwide in scope. Supplementing the national data files are published reports of interpretative analyses, a map
Authors
Marshall E. Jennings
VOLATILIZATION OF ALKYLBENZENES FROM WATER.
Volatilization is a physical process of importance in determining the fate of many organic compounds in streams and rivers. This process is frequently described by the conceptual-two-film model. The model assumes uniformly mixed water and air phases separated by thin films of water and air in which mass transfer is by molecular diffusion. Mass-transfer coefficients for the water and air films are
Authors
R. E. Rathbun, D. Y. Tai
WATER CHEMISTRY AND MINERALOGY OF MORGAN AND GROWLER HOT SPRINGS, LASSEN KGRA, CALIFORNIA.
Because these springs contain substantial amounts of dissolved chloride, halite and sylvite are found above the water level as evaporitic deposits, along with gypsum. One spring is depositing pyrite that contains significant amounts of arsenic, antimony, and thallium. A yellow compound, composed of arsenic and sulfur, is being deposited in another spring. Arsenic and antimony concentrations are hi
Authors
J. Michael Thompson, Terry E.C. Keith, Jerry J. Consul
WATER INFORMATION AVAILABLE FROM THE U. S. GEOLOGICAL SURVEY.
As a part of the Geological Survey's program of releasing water data to the public, two large-scale computerized systems are maintained. The National Water Data Storage and Retrieval System was developed to provide more effective and efficient management of data-releasing activities and provides for the processing, storage, and retrieval of surface-water, ground-water and water-quality data. Anoth
Authors
Charles R. Showen
YELLOWSTONE MAGMATIC-HYDROTHERMAL SYSTEM, U. S. A.
At Yellowstone National Park, the deep permeability and fluid circulation are probably controlled and maintained by repeated brittle fracture of rocks in response to local and regional stress. Focal depths of earthquakes beneath the Yellowstone caldera suggest that the transition from brittle fracture to quasi-plastic flow takes place at about 3 to 4 km. The maximum temperature likely to be attain
Authors
R.O. Fournier, A. M. Pitt
Assessing and managing effects of reduced freshwater inflow to two Texas estuaries
No abstract available
Authors
N.A. Funicelli
Morphology and evolutionary significance of Perissonoe, a new marine diatom genus
No abstract available.
Authors
George W. Andrews, V. A. Stoelzel
Spatial analysis requirements for a federal mineral land information system
No abstract available.
Authors
James A. Sturdevant, Richard L. Kleckner
Map revision using digital image processing techniques
No abstract available.
Authors
E. Lynn Usery, R. Welch
Geographic variation in ground shaking as a function of changes in near-surface properties and geologic structure near Los Angeles, California
No abstract available.
Authors
A. M. Rogers, Ladislaus C. Tinsley, Roger D. Borcherdt
Geology of Point Reyes Peninsula and implications for San Gregorio fault history
No abstract available.
Authors
J. C. Clark, E. E. Brabb, H. G. Greene, D. C. Ross