The structure of subtidal currents within and around Lydonia Canyon: Evidence for enhanced cross-shelf fluctuations over the mouth of the canyon
M. Noble, B. Butman
1989, Journal of Geophysical Research - Oceans (94) 8091-8110
Between October 1980 and April 1981, currents were measured within Lydonia Canyon and on the adjacent shelf and slope. The amplitude of the subtidal currents over the shelf and slope ranged between 10 and 30 cm s−1, but within the canyon, they were typically smaller than 5 cm s−1. The...
Multiobjective sampling design for parameter estimation and model discrimination in groundwater solute transport
Debra S. Knopman, Clifford I. Voss
1989, Water Resources Research (25) 2245-2258
Sampling design for site characterization studies of solute transport in porous media is formulated as a multiobjective problem. Optimal design of a sampling network is a sequential process in which the next phase of sampling is designed on the basis of all available physical knowledge of the system. Three objectives...
Accounting for intracell flow in models with emphasis on water table recharge and stream-aquifer interaction: 1. Problems and concepts
Donald G. Jorgensen, Donald C. Signor, Jeffrey L. Imes
1989, Water Resources Research (25) 669-676
Intracell flow is important in modeling cells that contain both sources and sinks. Special attention is needed if recharge through the water table is a source. One method of modeling multiple sources and sinks is to determine the net recharge per cell. For example, for a model cell containing both...
Temporal and spatial patterns of phytoplankton production in Tomales Bay, California, U.S.A.
B.E. Cole
1989, Estuarine, Coastal and Shelf Science (28) 103-115
Primary productivity in the water column was measured 14 times between April 1985 and April 1986 at three sites in Tomales Bay, California, USA The conditions at these three stations encompassed the range of hydrographic conditions, phytoplankton biomass, phytoplankton community composition, and turbidity typical of this coastal embayment. Linear regression...
Thermal infrared (2.5-13.5 μm) spectroscopic remote sensing of igneous rock types on particulate planetary surfaces
John W. Salisbury, Louis S. Walter
1989, Journal of Geophysical Research (94) 9192-9202
Fundamental molecular vibration bands are significantly diminished by scattering. Thus such bands in spectra of fine particulate regoliths (i.e., dominated by <5-μm particles), or regoliths displaying a similar scale of porosity, are difficult to use for mineralogical or rock type identification. Consequently, other spectral features have been sought that may...
Non-energy minerals and surficial geology of the continental margin of Maryland
R.T. Kerhin
1989, Marine Geology (90) 95-102
The surficial sediments have been mapped and the shallow geologic framework outlined of the Maryland inner continental shelf. The initial study encompassed a small area offshore of Assateague Island but was extended northward to include the Ocean City area and eastward...
Regional Jurassic geologic framework of Alabama coastal waters area and adjacent Federal waters area
R.M. Mink, B.L. Bearden, E. A. Mancini
1989, Marine Geology (90) 39-50
To date, numerous Jurassic hydrocarbon fields and pools have been discovered in the Cotton Valley Group, Haynesville Formation, Smackover Formation and Norphlet Formation in the tri-state area of Mississippi, Alabama and Florida, and in Alabama State coastal waters and adjacent Federal...
Late Quaternary paleolimnology of Walker Lake, Nevada
Bradbury J. Platt, R. M. Forester, R.S. Thompson
1989, Journal of Paleolimnology (1) 249-267
Diatoms, crustaceans, and pollen from sediment cores, in conjunction with dated shoreline tufas provide evidence for lake level and environmental fluctuations of Walker Lake in the late Quaternary. Large and rapid changes of lake chemistry and level apparently resulted from variations in the course and discharge of the Walker River....
Lead and cadmium associated with saltwater intrusion in a New Jersey aquifer system
Amleto A. Pucci Jr., Douglas A. Harriman, Elisabeth M. Ervin, Lisa Bratton, Alison Gordon
1989, Water Resources Bulletin (25) 1267-1272
The U.S. Geological Survey collected ground-water samples from the upper and middle aquifers of the Potomac-Raritan-Magothy aquifer system in a 400-square-mile area of New Jersey from 1984 through 1986. Concentrations of lead were greater than the U.S. Environmental Protection Agency maximum contaminant level (MCL) of 50 micrograms per liter in...
Artificial recharge of groundwater and its role in water management
J. O. Kimrey
1989, Desalination (72) 135-147
This paper summarizes and discusses the various aspects and methods of artificial recharge with particular emphasis on its uses and potential role in water management in the Arabian Gulf region.Artificial recharge occurs when man's activities cause more water to enter an...
Removing volatile contaminants from the unsaturated zone by inducing advective air-phase transport
A. L. Baehr, G.E. Hoag, M.C. Marley
1989, Journal of Contaminant Hydrology (4) 1-26
Organic liquids inadvertently spilled and then distributed in the unsaturated zone can pose a long-term threat to ground water. Many of these substances have significant volatility, and thereby establish a premise for contaminant removal from the unsaturated zone by inducing advective air-phase transport...
Early concepts of the role of microorganisms in hydrogeology
William Back
1989, Ground Water (27) 618-622
Hydrogeologists and geochemists have made great progress in the past few decades in understanding the water/rock interaction that are major controls on the chemical character of ground water. We also recognize that, for many reactions, we do not understand the specific mechanisms generating these reactions, such as those involved in...
A reinterpretation of the δDH2O of inclusion fluids in contemporaneous quartz and sphalerite, Creede mining district, Colorodo: a generic problem for shallow orebodies?
Nora K. Foley, Philip M. Bethke, Robert O. Rye
1989, Economic Geology (84) 1966-1977
Water extracted from fluid inclusions in quartz from shallow epithermal ore deposits often has a hydrogen isotope composition (δD) different from that of water extracted from inclusions in associated minerals. This difference is usually attributed to the involvement of primary fluids from multiple sources. Isotopic and homogenization and freezing temperature...
100 years of sedimentation study by the USGS
G. Douglas Glysson
1989, Conference Paper
On January 15, 1889, the U.S. Geological Survey began collecting sediment data on the Rio Grande at Embudo, New Mexico. During the past 100 years the U.S. Geological Survey's Water Resources Division (WRD) has collected daily sediment data at more than 1,200 sites. Projects have addressed the problems associated with...
Estimating urban flood-frequency characteristics
M.E. Jennings, J.B. Atkins, E. J. Inman
1989, Conference Paper
Methods in use by the U.S. Geological Survey to estimate flood-frequency characteristics for urban watersheds are compared with estimates based on the Soil Conservation Service TR-55 model. Data from four small urban watersheds in Georgia are used in the flood-peak and hydrograph comparisons....
Moderate-temperature zeolitic alteration in a cooling pyroclastic deposit
S. S. Levy, J. R. O’Neil
1989, Chemical Geology (76) 321-326
The locally zeolitized Topopah Spring Member of the Paintbrush Tuff (13 Myr.), Yucca Mountain, Nevada, U.S.A., is part of a thick sequence of zeolitized pyroclastic units. Most of the zeolitized units are nonwelded tuffs that were altered during low-temperature diagenesis, but the distribution and textural setting of zeolite (heulandite-clinoptilolite) and...
Mitigating oil and gas impacts in coastal wetlands
Donald R. Cahoon, Joseph C. Holmes Jr.
1989, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
This abstract refers to technical recommendations for avoiding, minimizing, and restoring (i.e., mitigating) drilling site access impacts related to oil and gas activities in coastal wetlands through regulatory review, drawing mostly from the Louisiana experience. The two standard methods used to access wetland drilling locations are canals and roads, both...
Air permeability and trapped-air content in two soils
David A. Stonestrom, Jacob Rubin
1989, Water Resources Research (25) 1959-1969
To improve understanding of hysteretic air permeability relations, a need exists for data on the water content dependence of air permeability, matric pressure, and air trapping (especially for wetting-drying cycles). To obtain these data, a special instrument was designed. The instrument is a combination of a gas permeameter (for air...
Water transport in limestone by X-ray CAT scanning
Victor G. Mossoti, Louis M. Castanier
1989, Conference Paper
The transport of water through the interior of Salem limestone test briquettes can be dynamically monitored by computer aided tomography (commonly called CAT scanning in medical diagnostics). Most significantly, unless evaporation from a particular face of the briquette is accelerated by forced air flow (wind simulation), the distribution of water...
Extraction of terrain features from digital elevation models
Curtis V. Price, David M. Wolock, Mark A. Ayers
1989, Conference Paper
Digital elevation models (DEMs) are being used to determine variable inputs for hydrologic models in the Delaware River basin. Recently developed software for analysis of DEMs has been applied to watershed and streamline delineation. The results compare favorably with similar delineations taken from topographic maps. Additionally, output from this software...
Geographic information system/watershed model interface
Gary T. Fisher
1989, Conference Paper
Geographic information systems allow for the interactive analysis of spatial data related to water-resources investigations. A conceptual design for an interface between a geographic information system and a watershed model includes functions for the estimation of model parameter values. Design criteria include ease of use, minimal equipment requirements, a generic...
Discharge of sediment in channelized alluvial streams
Andrew Simon
1989, Water Resources Bulletin (25) 1177-1188
Approximately 400 million cubic feet of channel sediments have been delivered to the Mississippi River from the Obion-Forked Deer River system in the last 20 years. The discharge of sediment from these channelized networks in West Tennessee varies systematically with the stage of channel evolution. Maximum bed-material discharges occur during...
Data-collection program for Pamlico River Estuary model calibration and validation
Jerad D. Bales
1989, Conference Paper
An investigation is being conducted to collect and interpret continuous records relating to the flow characteristics of the Pamlico River Estuary, North Carolina, and to calibrate and validate a numerical model of estuarine hydrodynamics. The study reach is 50 kilometers long and ranges in width from 330 meters at the...
Monitoring and design of stormwater control basins
J.E. Veenhuis, J.H. Parrish, M.E. Jennings
1989, Conference Paper
The City of Austin, Texas, has played a pioneering role in the control of urban nonpoint source pollution by enacting watershed and stormwater ordinances, overseeing detailed monitoring programs, and improving design criteria for stormwater control methods. The effectiveness of the methods used in Austin, and perhaps in other areas of...
Spatial and temporal variability in South San Francisco Bay (USA). II. Temporal changes in salinity, suspended sediments, and phytoplankton biomass and productivity over tidal time scales
J. E. Cloern, T.M. Powell, L.M. Huzzey
1989, Estuarine, Coastal and Shelf Science (28) 599-613
Short-term variability of a conservative quantity (salinity) and two nonconservative quantities (chlorophyll a, suspended particulate matter) was measured across a sampling grid in the South San Francisco Bay estuary. Surface measurements were made every 2 h at each of 29 (or 38) sites,...
