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Articles 991 - 1020 of 1835

Full-Text Articles in Physical Sciences and Mathematics

Comparative Analysis Of Sea Scallop Escapement/Retention And Resulting Economic Impacts, William D. Dupaul, Edward J. Heist, James E. Kirkley Jan 1988

Comparative Analysis Of Sea Scallop Escapement/Retention And Resulting Economic Impacts, William D. Dupaul, Edward J. Heist, James E. Kirkley

Reports

During the months of June and September 1988, gear experiments were conducted aboard the F/V Carolina Dawn and Carolina Capes. The primary objective of the experiments was to assess the technical efficiency and size selectivity of 3.5-inch ring dredges relative to the current commercially-used 3.0-inch ring dredges. Secondary objectives were to analyze the economic and regulatory ramifications of using 3.5-inch ring dredges to control the age-at-capture and enhance the yield-per- recruit.

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Reconnaissance Of Economic Heavy Minerals Of The Virginia Inner Continental Shelf, C. R. Berquist, C. H. Hobbs Iii Jan 1988

Reconnaissance Of Economic Heavy Minerals Of The Virginia Inner Continental Shelf, C. R. Berquist, C. H. Hobbs Iii

Reports

No abstract provided.

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Oyster Spatfall In Virginia Rivers: 1987 Annual Summary, James Whitcomb Dec 1987

Oyster Spatfall In Virginia Rivers: 1987 Annual Summary, James Whitcomb

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells is counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur.

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Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson Jul 1987

Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson

Reports

No abstract provided.

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Recent Improvements Of Water Quality And Biological Indicators In The North-Eastern Tampa Bay, City Of Tampa Bay Department Of Sanitary Sewers May 1987

Recent Improvements Of Water Quality And Biological Indicators In The North-Eastern Tampa Bay, City Of Tampa Bay Department Of Sanitary Sewers

Reports

Simple analysis of our data clearly indicate that water quality conditions in north-eastern Tampa Bay has improved during our study. Further, there are no indications that this improvement has yet climaxed.

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Response Characteristics Of A Short Range, High Resolution, Digital Sonar Altimeter, Malcolm O. Green, John D. Boon Mar 1987

Response Characteristics Of A Short Range, High Resolution, Digital Sonar Altimeter, Malcolm O. Green, John D. Boon

Reports

The Datasonics Model ASA-920 digital sonar altimeter (DSA) is a compact, high frequency (1 MHz), short range (0.5 to 5 m) underwater sonar device originally designed as an altimeter for submersib1es. Wright et al. (1986) have used the DSA successfully to measure changes in relative bed elevation at a point on the shoreface prior to and during a storm. Fixed to a rigid mounting on the seabed, the DSA produces a digital output that is proportional to the transducer elevation above the bed. The purpose of this report is to describe the response characteristics of the DSA.

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Ware Creek Reservoir Release Study : Final Contract Report Submitted To James City County, Virginia Institute Of Marine Science Jan 1987

Ware Creek Reservoir Release Study : Final Contract Report Submitted To James City County, Virginia Institute Of Marine Science

Reports

In Summer, 1986 a field program was conducted in Ware Creek from its mouth at the York River to the dam at Richardson's Millpond. The data collected was combined with flow data from USGS and a tide record from NOAA and was used to calibrate and verify a one-dimensional, real-time, hydrodynamic and salinity intrusion model. The model has been applied to study the effect of the proposed dam and reservoir on the salinity distribution in Ware Creek.

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Bear River Water Quality: Phosphorus Control And The Impacts Of Exchanging Water With Willard Reservoir, Darwin L. Sorensen, Craig Caupp, Kenneth W. Barker, Jean M. Ihnat Jan 1987

Bear River Water Quality: Phosphorus Control And The Impacts Of Exchanging Water With Willard Reservoir, Darwin L. Sorensen, Craig Caupp, Kenneth W. Barker, Jean M. Ihnat

Reports

No abstract provided.

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Engineering Treatment Of Hazardous Wastewaters Utilizing Dye-Sensitized Photooxidation, Betty-Ann Naeger, R. Ryan Dupont, William M. Moore Jan 1987

Engineering Treatment Of Hazardous Wastewaters Utilizing Dye-Sensitized Photooxidation, Betty-Ann Naeger, R. Ryan Dupont, William M. Moore

Reports

Studies were conducted to determine the applicability of photooxidation for the degradation of selected hazardous and refractory organic compounds. These photochemical oxidation reactions occur through the transfer of energy from electronically excited sensitizer molecules which attain excited states by absorbing visible light energy. Optimum conditions for photooxidation were established based on sensitizer concentration and reaction pH for four polynuclear aromatic pollutants. The rate of photooxidation was found to be independent of the initial substrate concentration for methylene blue-sensitized reactions, and dependent on substrate concentration for solutions without a sensitizing dye. Photolysis of substrate mixtures established acridine and anthracene as photochemically …

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Expected Water Surface Levels For The Great Salt Lake, L. Douglas James Jan 1987

Expected Water Surface Levels For The Great Salt Lake, L. Douglas James

Reports

Flooding at the Great Slat Lake could become a major disaster through the high cost of coping with the rising level, sudden collapse of protective levees, failure of pumping to the West Desert to induce increased evaporation, or, fiscally, by a rapid drop in the lake level just after a large protective decision making in the private sector, provide for the design of hydrologically safe levees, and optimize pumping schemes for moving water within a partitioned lake. Doing so will require crossing major theoretical frontiers in the study of basin scale hydrology in an arid climate and for forecasting extreme …

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The State Of Tampa Bay 1986, Agency On Bay Management Jan 1987

The State Of Tampa Bay 1986, Agency On Bay Management

Reports

When the Tampa Bay Regional Planning Council created the Agency on Bay Management, it charged the group with preparing an annual status of the condition of Tampa Bay, the state's largest open water estuary. Therefore, pursuant to the adopted rules of the Council's Agency on Bay Management, this document is the first State of Tampa Bay report. This report includes a discussion of the history of the Agency, an evaluation of how well the bay is doing environmentally and recommendations about what needs to be done in the work program aimed at improving Tampa Bay.

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Polynuclear Hydrocarbons In Sediments And Clams In The Vicinity Of A Refinery Outfall, P. O. Defur, M. E. Bender, C. W. Su, Et Al Jan 1987

Polynuclear Hydrocarbons In Sediments And Clams In The Vicinity Of A Refinery Outfall, P. O. Defur, M. E. Bender, C. W. Su, Et Al

Reports

The objectives of this study were: 1) to determine whether certain organic substances (polynuclear aromatic hydrocarbons) present in a refinery process water are found in adjacent sediments and bivalves; and 2) to determine the concentrations of the compounds detected.

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Oyster Spatfall In Virginia Rivers: 1986 Annual Summary, James Whitcomb Jan 1987

Oyster Spatfall In Virginia Rivers: 1986 Annual Summary, James Whitcomb

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells is counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur.

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Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway Jr., S. M. Kimball, M. O. Green Jan 1987

Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway Jr., S. M. Kimball, M. O. Green

Reports

The processes which drive the beach and nearshore changes vary considerably in space and time. The spatial variability is the result of modulations of waves and wave induced processes by the complex topography of the shoreface and inner shelf fronting the beaches. In this study we employed a state-of-the-art computer model to evaluate the nature of these modifications and their impact on coastal processes. The model estimates wave modifications by shoaling, refraction, diffraction. and loss of wave energy by frictional interaction with the bottom.

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Groundwater Resources Of The Virgin River Basin In Utah, Calvin G. Clyde Jan 1987

Groundwater Resources Of The Virgin River Basin In Utah, Calvin G. Clyde

Reports

The Division of Water Resources is conducting a study of further water development in the Virgin River Basin. This report examines the effects of groundwater development as a part of the overall study. The study area includes about 1000 square miles in the Central Virgin River Basin east of the Hurricane Fault. The deeply incised Virgin River has cut a youthful drainage network with deep canyons and steep escarpments and drains out of southwest Utah across Arizona to Lake Mead in Nevada. A basin-wide geologic map emphasizing groundwater features has been prepared from available reports. Outcrops of the principal sedimentary …

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Occurrence And Distribution Of Shell In The Vicinity Of Parker's Rock, Pocomoke Sound, Carl H. Hobbs Iii Jan 1987

Occurrence And Distribution Of Shell In The Vicinity Of Parker's Rock, Pocomoke Sound, Carl H. Hobbs Iii

Reports

This is a summary report on the investigation of the occurrence and distribution of shell in the vicinity of Parker's Rock. Pocomoke Sound. The investigation was performed by the Virginia Institute of Marine Science at the request and with the financial support of the Virginia Marine Resources Commission. The site (Figure 1) was selected. primarily. at the direction of the Commission. acting on the recommendation of its shell-dredging contractor and. secondarily. with supporting reconnaissance seismic data from VIMS.

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Results Of Comparative Studies Of Preservation Techniques For Nutrient Analysis Of Water Samples, Betty A. Salley, Julie G. Bradshaw, Bruse J. Neilson Jan 1987

Results Of Comparative Studies Of Preservation Techniques For Nutrient Analysis Of Water Samples, Betty A. Salley, Julie G. Bradshaw, Bruse J. Neilson

Reports

No abstract provided.

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Cabin Point Creek Channelization Study : Final Report, Walter I. Priest Iii, Robert J. Byrne, Bruce J. Neilsen, George R. Thomas Jan 1987

Cabin Point Creek Channelization Study : Final Report, Walter I. Priest Iii, Robert J. Byrne, Bruce J. Neilsen, George R. Thomas

Reports

In the realm of environmental impact assessment and analysis the effects of a proposed project are most often referred to in the subjunctive sense because of the qualifications and probabilities related to these postulations. Seldom does the opportunity present itself to follow a project to fruitition and beyond to, in fact, determine the validity of the assumptions made in arriving at the potential impacts of a project. Even less often is it possible to monitor a project from prior to construction to several years after the project has been completed to ascertain the exact nature of the projects impacts, compare …

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Field Measurements Of Tidal Currents, I664 Tunnel Axis, Hampton Roads, Virginia : A Report To Morrison-Knudsen/Interbeton, Physical Oceanography Division, Virginia Institute Of Marine Science Jan 1987

Field Measurements Of Tidal Currents, I664 Tunnel Axis, Hampton Roads, Virginia : A Report To Morrison-Knudsen/Interbeton, Physical Oceanography Division, Virginia Institute Of Marine Science

Reports

Currents in the region of Newport News Point of the James River were measured at the request of Morrison-Knudsen/Interbeton to examine maximum flood and ebb values during spring tides and determine first order relationships of current strengths and phase lags between this region and Chesapeake Bay Entrance predictions.

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A Mark-Recapture Study Of Striped Bass In The James River, Virginia : Annual Report 1987, Joseph G. Loesch, William H. Kriete Jr., Bruce W. Hill Jan 1987

A Mark-Recapture Study Of Striped Bass In The James River, Virginia : Annual Report 1987, Joseph G. Loesch, William H. Kriete Jr., Bruce W. Hill

Reports

Internal anchor tags with external tubes were used to tag 1,986 striped bass in the James River in the Spring of 1987. The total number tagged was adjusted (at this time) to 823 because of observed and suspected tagging mortality. The available stock of striped bass in the Spring contained both young resident fish and mature nonresident fish which left the area of capture after spawning, presumably to migrate north in coastal waters. The exodus of the mature fish after spawning and the absence of a commercial fishery resulted in only 42 tag returns as of Spring 1988. This proportion …

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Forested Buffer Zones : Pilot Studies On Efficiency In Reducing Surface And Shallow Groundwater Nutrient Inputs To Estuarine Waters, Carl Hershner Jan 1987

Forested Buffer Zones : Pilot Studies On Efficiency In Reducing Surface And Shallow Groundwater Nutrient Inputs To Estuarine Waters, Carl Hershner

Reports

This study was designed as a pilot study with the intent of identifying important considerations for the design and conduct of an investigation of forested buffer strip performance in Virginia's coastal plain. The approach 3 4' I was to conduct a small preliminary study on a single site using the opportunity to investigate a number of potential sampling methods.

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Sediment Oxygen Demand In Hunting Creek And The Potomac River, Carl F. Cerco Jan 1987

Sediment Oxygen Demand In Hunting Creek And The Potomac River, Carl F. Cerco

Reports

Sediment oxygen demand measures were conducted in Hunting Creek during the period June 17 to August 19, 1986.

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Plume Monitoring Of Rappahannock And York Spit Channels, Baltimore Harbor And Channels: Phase 1, M. Nichols, R. J. Diaz, Et Al Jan 1987

Plume Monitoring Of Rappahannock And York Spit Channels, Baltimore Harbor And Channels: Phase 1, M. Nichols, R. J. Diaz, Et Al

Reports

A major element and concern necessary for evaluating the environmental impact of dredging operations is the dispersion of finegrained dredged material. The turbid plume generated by draghead agitation and by overflow processes from a hopper dredge can dictate the degree of potential adverse effects. Under certain environmental and aesthetic circumstances control of the plume may be advisable. Although turbid plumes produced by open water disposal operations have been evaluated in many investigations (e.g. Barnard. 1978). detailed field assessments of plumes produced by hopper dredging operations are scarce.

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Distribution Of Submerged Aquatic Vegetation In The Chesapeake Bay And Tributaries And Chincoteague Bay - 1986, Robert Orth, Jim Simons, Judith Capelli, Virginia Carter, Adam A. Frisch, Larry Hindman, Stephen Hodges, Kenneth A. Moore, Nancy Rybicki Jan 1987

Distribution Of Submerged Aquatic Vegetation In The Chesapeake Bay And Tributaries And Chincoteague Bay - 1986, Robert Orth, Jim Simons, Judith Capelli, Virginia Carter, Adam A. Frisch, Larry Hindman, Stephen Hodges, Kenneth A. Moore, Nancy Rybicki

Reports

No abstract provided.

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Monogenetic Trematodes From The Southern Pacific Ocean Polyopisthocotyleids From The Australian Fishes, The Subfamily Polylabrinae And Microcotylinae, W. A. Dillon, William J. Hargis Jr., Antonio E. Harrises Jan 1987

Monogenetic Trematodes From The Southern Pacific Ocean Polyopisthocotyleids From The Australian Fishes, The Subfamily Polylabrinae And Microcotylinae, W. A. Dillon, William J. Hargis Jr., Antonio E. Harrises

Reports

This eighth of a series of monogenetic trematodes from the Southern Pacific Ocean discusses two species of Monogenea from Australian waters. Polylabroides mylionis n. sp., from the gills of Mylio butcheri, is described. Neobivagina agonostomi (Sandars, 1945} Dillon and Hargis, 1965, from the gills of Aldrichett~ forsteri, is redescribed; a new locality record is reported for Neobivagina agonostomi.

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Hydrographic Data From The Wolftrap Section, 1982-1983, L. M. Huzzey, J. M. Brubaker Nov 1986

Hydrographic Data From The Wolftrap Section, 1982-1983, L. M. Huzzey, J. M. Brubaker

Reports

No abstract provided.

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Chesapeake Bay Marine Environmental Assessment December 1985 - February 1986, Karen Kelly, Terry L. Bashore, Karen L. Mcdonald Oct 1986

Chesapeake Bay Marine Environmental Assessment December 1985 - February 1986, Karen Kelly, Terry L. Bashore, Karen L. Mcdonald

Reports

No abstract provided.

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Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson Oct 1986

Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson

Reports

No abstract provided.

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Winter And Summer Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers Sep 1986

Winter And Summer Sediment Nutrient Exchange Rates In Hillsborough Bay, Florida, City Of Tampa Department Of Sanitary Sewers

Reports

Winter and summer in-situ measurements of sediment oxygen demand (SOD) and nutrient exchange rates (NERs) were taken from sandy and muddy sediments in Hillsborough Bay during 1986. The summer-mud SOD rate of 0.23 g 02/m2/hr was roughly twice the summer-sand, winter-sand and winter-mud SOD rates. In general, nutrient flux rates into the water column were usually greater from mud relative to sand, and during the summer compared to the winter. Reservations in the application of the SOD/NER data and recommendations for future SOD/NER measurements are discussed.

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Ecological Assessment, Classification And Management Of Tampa Bay Tidal Creeks, Tampa Bay Regional Planning Council (Tbrpc) Sep 1986

Ecological Assessment, Classification And Management Of Tampa Bay Tidal Creeks, Tampa Bay Regional Planning Council (Tbrpc)

Reports

The final product is a detailed restoration and management plan for three minor tributaries in the Tampa Bay watershed and one general application. It is the intent of the Council to implement all elements of the four plans wherever feasible during Developments of Regional Impact (DRI's) and Intergovernmental Coordination and Review (IC&R) reviews and through coordinat.ion with the DNR gill-net license fee habitat restoration program, as well as local government initiatives. The efforts of the Council's Agency on Bay Management will also be critical in implementing the findings and recommendations of this project.

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