Physical Sciences and Mathematics Commons^™

Degradation Kinetics Of Aromatic Organic Solutes Introduced Into A Heterogeneous Aquifer, Wg Macintyre, M Boggs, Cp Antworth, Tb Stauffer

VIMS Articles

Degradation rates of benzene, p-xylene, naphthalene, and o-dichlorobenzene have been measured in a heterogeneous, unconfined aquifer during a pulse injection experiment at Columbus Air Force Base, Columbus, Mississippi. Dissolved oxygen in the pulse plume maintained aerobic conditions. Degradation kinetics calculated from the complete field data set were approximately first order with the following rate constants: benzene, 0.0070 d-1; p-xylene, 0.0107 d-1; naphthalene, 0.0064 d-1; and o-dichlorobenzene, 0.0046 d-1. Reaction rates were also calculated from a near-field subset of the data using a model based on the hydrologic characteristics of the aquifer. Shapes of the degradation rate curves were consistent with …

Distribution Of Submerged Aquatic Vegetation In The Chesapeake Bay And Tributaries And Chincoteague Bay - 1992, Robert Orth, Judith F. Nowak, Gary F. Anderson, Jennifer R. Whiting

Reports

No abstract provided.

Plowing Through The Muck: A Review Of Wetland Assessment I Evaluation Methods, Melissa Chaun, Virginia Institute Of Marine Science, Wetlands Program

Reports

No abstract provided.

The Virginia Wetlands Report No. 93-10, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Terns. Julie G. Bradshaw
• Atlantic Croaker. Lyle Varnell
• The Importance of Natural Resource Inventories. Carl Hershner and Marcia Berman
• Estuarine Research Reserves in Virginia. Bland Crowder
• The York River Reserve Sites. The National Estuarine Research Reserve System. Newport News City Park. Pam Mason
• Wood Preservative Treatments for Marine Construction. Walter I. Priest, III

Order And Chaos In Semiconductor Microstructures, W. A. Lin, John B. Delos, Robert E. Jensen

Arts & Sciences Articles

The semiclassical theory of ballistic electron transport in semiconductor microstructures provides a description of the quantum conductance fluctuations in terms of the classical distributions for the lengths and directed areas of the scattering trajectories. Because the classical dynamics differs for integrable (circular) and chaotic (stadium) scattering domains, experimental measurements of the conductance of these microstructures provide a unique probe of the quantum properties of classically regular and chaotic systems. To advance these theoretical and experimental studies we compare geometrical formulas for the classical distributions of lengths and areas with numerical simulations for microstructures examined in recent experiments, we assess the …

Virginia Beach Offshore Sediment Study, C. R. Berquist Jr., Naomi Gomillion

Reports

This investigation was initiated from discussions among members of the Minerals Management Service-Virginia Task Force in an effort to locate a nearby and offshore source of beach-quality sand for the resort strip at Virginia Beach. Because of the increasing difficulty of relying upon land-based material, attention has been focused on investigating offshore sources. Previous work (Kimball and others, 1991) suggests an offshore deposit of beach-quality sands is located on a shoal between 3 and 8 km east of Sandbridge. Planned vibracoring on this shoal during the fall of 1993 should establish the viability of the sand occurrence. Although material from …

Photoabsorption Spectra Of Atoms In Parallel Electric And Magnetic Fields, J. M. Mao, K. A. Rapelje, S. J. Blodgett-Ford, John B. Delos, A. König, H. Rinneberg

Arts & Sciences Articles

Measurements have been made of the absorption spectrum of Ba from the 6s6p 1P1 level to states near the ionization threshold in parallel electric and magnetic fields. The absorption spectrum shows oscillations superposed on a smooth background. Each oscillation is correlated with a closed orbit of the electron. At strong electric fields, trajectories are regular, and closed orbits form orderly patterns. For weak electric fields, trajectories are chaotic, and many more closed orbits are present. Many of these are produced by bifurcations as the electric field is reduced.

Data Report : Hypoxia In The James River, 1992, G. M. Sisson, A. Y. Kuo, Bruce Neilson, Nancy C. Wilson

Reports

As part of the hypoxia program of the Virginia Chesapeake Bay Initiatives, the Department of Physical Sciences of the Virginia Institute of Marine Science (VIMS) conducted a series of measurements around the mouth of the James River estuary. The measurements were made in the summer of 1992. Two types of measurements were conducted: measurements at moored stations and measurements by slackwater surveys. The former collected data for investigation of dissolved oxygen (DO) variation, and associated physical parameters, in an intratidal time scale, as well as for studying the vertical distributions of the measured parameters. The latter collected data for spatial …

The Virginia Wetlands Report No. 93-8, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Swamp Sparrow. Julie G. Bradshaw
• Dredging Buffers. Walter I. Priest, III
• Sturgeon. Lyle Varnell
• Mapping the Coastline. Marcia Berman
• VIMS Hosts Wetlands Functional Assessment Workshop. Carl Hershner
• Mid-Atlantic Wetland Compensatory Mitigation Workshop. Thomas Barnard
• Mason Neck National Wildlife Refuge. Pam Mason

Water Quality In Chesapeake Bay : Virginia Portion, Water Year 1992 : A Report To The Virginia Department Of Environmental Quality, Kevin Curling, Rodney Jackson, Bruce Neilson

Reports

The Chesapeake Bay Water Quality Monitoring Program (WQMP) has three main objectives: (1) characterization of water quality conditions, (2) detection of temporal trends in water q1llality, and (3) crr.ation of a data base that furthers our understanding of the proceses that control water quality in the Chesapeake Bay system. The purpose of this report is to characterize water quality conditions in the Virginia portion of Chesapeake Bay during the 1992 water year, which runs from October 1991 through September 1992. These monitoring efforts have been conducted with funding from the US Environmental Protection Agency and the Commonwealth of Virginia.

Natural Resource Management In Coastal Virginia, Pamela Mason, Virginia Institute Of Marine Science, Wetlands Program

Reports

No abstract provided.

Cape Charles Public Beach Assessment Report, C. Scott Hardaway Jr., Donna A. Milligan, George R. Thomas

Reports

No abstract provided.

Water Quality In Chesapeake Bay : Virginia Portion, Water Year 1991 : A Report To The Virginia Water Control Board, Kevin Curling, Bruce Neilson

Reports

The purpose of this report is to characterize water quality conditions during the 1991 water year, October 1990 through September 1991. Most information is provided in graphical format and only data for the Virginia portion of Chesapeake Bay is included. No interpretation is included, since data analysis is the stated purpose of several other reports. This report and companion data reports provide to both scientists and managers ready access to a portion of the data. It is possible, for example, to quickly examine seasonal patterns, compare conditions at two stations, or see if surface and bottom conditions differ significantly. Trends, …

Hypoxia In The York River, 1991, A. Y. Kuo, Bruce Neilson, J. M. Brubaker, E. P. Ruzecki

Reports

This data report describes field studies conducted during the summer of 1991 by the Virginia Institute of Marine Science (VIMS) when both the physical environment and the dissolved oxygen regime were monitored, with the objective of better understanding how physical transport processes affect DO. The 1991 data sets will be presented here. Analysis and interpretation of the data is the subject of other scientific reports.

Data Base Development For Characterizing Contaminated Sediments In The Chesapeake Bay Region, Gary F. Anderson, Caroline Brouwer-Riel, Maynard M. Nichols

Reports

This project is one component of the U.S. Geological Survey's National Coastal Geology Program directed to polluted sediments. Its long-term aim is to develop a comprehensive database on estuarine contaminated sediments that provides a summary of information and a digital reference source of detailed and readily accessible data. It focuses on Chesapeake Bay because there is a wealth of data on bottom sediments and sedimentary contaminants. However, this data is fragmented, uncollated and dispersed in many papers, books, reports, files and documents, often local sources, outside the mainstream of national consideration and scientific knowledge. Without an organized body of data, …

Photodetachment Cross Section Of H- In Crossed Electric And Magnetic Fields. I. Closed-Orbit Theory, Aaron D. Peters, John B. Delos

Arts & Sciences Articles

In this, the first of two papers, we obtain a simple analytic formula for the photodetachment cross section of H− in crossed electric and magnetic fields. The three-dimensional semiclassical approximation predicts oscillations in the spectrum and these oscillations are correlated with closed classical orbits. In the following paper [A. D. Peters and J. B. Delos, Phys. Rev. A 47, 3036 (1993)] we derive fully-quantum-mechanical formulas for the cross section in perpendicular electric and magnetic fields and show how these results can be reduced to the semiclassical results of this paper.

Photodetachment Cross Section Of H- In Crossed Electric And Magnetic Fields. Ii. Quantum Formulas And Their Reduction To The Result Of The Closed-Orbit Theory, Aaron D. Peters, John B. Delos

Arts & Sciences Articles

In this, the second of two papers, we derive general quantum formulas for the photodetachment cross section for H− in perpendicular electric and magnetic fields. The results are valid for any polarization and can be reduced to the semiclassical results of the first paper [A. D. Peters and J. B. Delos, Phys. Rev. A 47, 3020 (1993)]: a smooth background plus oscillatory terms. This connection between the quantum and semiclassical results is made using a stationary-phase approximation and it is shown that each stationary-phase point corresponds to a closed orbit.

The Virginia Wetlands Report No. 93-4, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Little Blue Heron. Julie G. Bradshaw
• Cobia. Lyle Varnell
• Mapping our Coastal Inventory. Marcia Berman
• Wetlands Delineation- The Dilemma Continues Seashore State Park. Pam Mason
• Ecotourism and the Chesapeake Bay. Thomas Barnard
• What is Riprap? Walter I. Priest, III

The Progression Of "No Discharge Zone" Status In Water Bodies Across The Continental United States, Melissa Chaun

Reports

No abstract provided.

Status Of The Major Oyster Diseases In Virginia 1992 A Summary Of The Annual Monitoring Program, Eugene M. Burreson

Reports

No abstract provided.

An Assessment Of Aquatic Wildlife Utilization Between Created And Natural Tidal Salt Marshes, Kirk J. Havens, Lyle M. Varnell, Virginia Instiute Of Marine Science, Wetlands Program

Reports

No abstract provided.

Development Of "No Discharge" Zones In Virginia Tidal Waters Phase I, Center For Coastal Resources Management, Virginia Institute Of Marine Science

Reports

he Commonwealth of Virginia currently has no regulations in effect to restrict the discharge of waste from vessels in state waters. This poses concern as Virginia continues its efforts to improve water quality in the Chesapeake Bay. The degradation of critical environmental habitat is accelerated by the introduction of waste, which in turn threatens the ecological, aesthetic, and commercial values of Virginia's waters. The purpose of this project is two-fold. First a comprehensive review of regulatory statutes in states enforcing "no discharge" zones (NDZ) was conducted. This product is delivered as a separate document. Second, a large-scale inventory of environmentally …

A Proposed Comprehensive Conservation And Management Plan For The Ungranted State Lands In Accomack And Northampton Countie, N. Bartlett Theberge, Pamela J. Nestell, Susan W. Carter

Reports

The goal of this management plan is to conserve and manage the fragile and dynamic coastal habitat and resources subject to this plan while accommodating compatible public uses.

To date 28,507 acres of ungranted state lands have been identified in Accomack and Northampton Counties. The purpose of this plan 1s to develop a comprehensive conservation and management strategy for these state owned beaches marshes, meadowlands, commons, and other coastal lands which constitute a fragile and dynamic natural coastal resource of the Commonwealth of Virginia.

Sediment Characterization Of South Atlantic Systems, Maynard M. Nichols

Reports

The estuarine systems selected are from the NOAA National Estuarine Inventory in the EMAP Virginian Province (Figure 1). The principal spatial unit of each system is the estuarine drainage area (EDA) defined in the NEI data atlas (U.S. NOAA, 1985). The sediment and contaminant distributions embrace the estuarine bottom area, i.e. from the head of tides to the mouth where the estuary meets the ocean, bay or sound as determined by physiographic features (U.S. NOAA, 1985). Data coverage embraces whole estuaries and farfield distributions. Chart scales are smaller than 1:80,000 andchart units larger thaqn 0.1 square kilometer.

Effects Of The Habitat And Size-Specific Predation On The Ontogenetic Shift In Habitat Use By Newly Settled Blue Crabs, Callinectes Sapidus, Adele J. Pile

Dissertations, Theses, and Masters Projects

No abstract provided.

Distribution Of Organochlorine Pollutants In Sea Turtles, Mary J. Rybitski

Dissertations, Theses, and Masters Projects

No abstract provided.

Molecular Diffusion Coefficients For Polycyclic Aromatic Hydrocarbons In Air And Water, Kurt E. Gustafson

Dissertations, Theses, and Masters Projects

No abstract provided.

Interspecific And Intraspecific Variability In Placoid Scale Morphology In Relation To Body Form Variability In Squaliformes, Christopher R. Tabit

Dissertations, Theses, and Masters Projects

An ontogenetic series of nine species; Centrophorus granulosus, Centroscymnus coelolepis, Dalatias licha, Deania calcea, Echinorhinus cookei, Isistius brasiliensis, Oxynotus centrina and Squalus acanthias were studied to determine swimming capabilities, boundary-layer flow conditions and placoid scale functional morphologies. Body morphometric variables included the girth and the distance from snout to the orbitals, origin of the median and paired fins, and the caudal peduncle, body and fin surface area, fin aspect ratios and caudal fin angles. Placoid scales were sampled from sixteen regions across the body. Morphometric variables included the number of scales per area of integument, scale crown width, length and …

Boundary Layer Structure In Homogeneous Tidal Flows: A Theoretical And Numerical Study, Jian Shen

Dissertations, Theses, and Masters Projects

No abstract provided.

The Dynamics Of An Oligohaline, Macrofaunal, Fouling Community, Michelle Lynne Thompson Neubauer

Dissertations, Theses, and Masters Projects

No abstract provided.