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Articles 51961 - 51990 of 52771

Full-Text Articles in Physical Sciences and Mathematics

Patterns Of Land Use Change Around A Large Reservoir, Billy R. Prebble Jan 1969

Patterns Of Land Use Change Around A Large Reservoir, Billy R. Prebble

KWRRI Research Reports

Reservoirs are built to control floods, provide water for irrigation and municipal supply, generate electric power, augment low flows for navigation and water quality control, and provide improved fishing and recreation opportunity. A reservoir is justified if the benefit it provides to society exceeds the cost to develop it. Much research has been done to determine the benefit of a water resources development to society as a whole. Some research has explored the benefit of such a facility to a region. Very little research exists on the effects of a reservoir on the immediately surrounding area.

It seems reasonable that …


Economic Development Of Areas Contiguous To Multipurpose Reservoirs: The Kentucky-Tennessee Experience, Michael B. Hargrove Jan 1969

Economic Development Of Areas Contiguous To Multipurpose Reservoirs: The Kentucky-Tennessee Experience, Michael B. Hargrove

KWRRI Research Reports

This study analyzes the effects of multi-purpose reservoir projects on the economic development of areas contiguous to the dam and reservoir. The study concentrates on the development potential in a humid region where the provision of agricultural water is not critical to the economy. Can a reservoir project be a major part of a development program for a local area? How can the favorable effects of the project on the contiguous area be increased? These questions are answered by this study.

The study is divided into three major phases. The first phase is a theoretical analysis of the determinants of …


The Persistence Of Pesticides In Impounded Waters, Robert A. Lauderdale Jan 1969

The Persistence Of Pesticides In Impounded Waters, Robert A. Lauderdale

KWRRI Research Reports

The purpose of this study was to investigate the persistance of the insecticides aldrin, dieldrin, chlordane, and DDT in water. A small drainage area was sprayed with these compounds, and the insecticides were collected in the runoff water from the area. Laboratory experiments were performed to determine the effectiveness of aeration, adsorption on silt, and adsorption on algae in removing the pesticides from water.

All of the pesticides were found in samples of water collected from the area for the full period of the tests. The amounts which were found in a small pond into which the surface water drained …


Water Quality Changes Under Ice Cover In Northern Prairie Lakes, Steven P. Gloss Jan 1969

Water Quality Changes Under Ice Cover In Northern Prairie Lakes, Steven P. Gloss

Electronic Theses and Dissertations

Water quality changes under ice cover were studied in seven northern prairie lakes. The lakes are high in dissolved materials and exist essentially as closed systems during the winter months. Ice cover ranging from 53 to 86 cm developed on the lakes. Melted ice samples showed small amounts of dissolved impurities present in surface layers of the ice. No substantial concentrations of any ions were found in the ice of lower layers. Specific conductance increased over 40% under ice cover in two of the lakes studied. Increases in other lakes ranged from 19 to 38%. Major ions showed increases similar …


Evaluation Of The Ovulated Follicle Technique As A Means Of Determining Pheasant Production, C. Denis Allen Jan 1969

Evaluation Of The Ovulated Follicle Technique As A Means Of Determining Pheasant Production, C. Denis Allen

Electronic Theses and Dissertations

A study of the ovulated follicle technique for determining egg production in pheasants was conducted during 1967 - 1969. Evidence indicated collection of wild hens for follicle counts should be between 5 and 14 weeks after cessation of laying. Questionable follicles encountered should be considered ovulated follicles and included in the counts. Most questionable follicles were believed to originate from ovulated atretic follicles that were harder to identify because of their particular stage of regression. The influence of freezing on atretic follicle counts was studied, and no adverse effects were found. A technique was developed for selectively staining atretic follicles. …


Summer Movements Of Bigmouth Buffalo In Lake Poinsett, South Dakota, Thomas J. Clifford Jan 1969

Summer Movements Of Bigmouth Buffalo In Lake Poinsett, South Dakota, Thomas J. Clifford

Electronic Theses and Dissertations

Movements of bigmouth buffalo in Lake Poinsett, South Dakota were studied from 1 June to 31 August, 1968. Bigmouth buffalo were individually marked with Styrofoam floats and tracked visually during daylight hours. Buffalo at a relatively constant, slow rate averaging .346 km/hr (0.05 km/hr to 1.4 km/hr). Two study indicated that bigmouth buffalo in Lake Poinsett had no home range or homing tendency and inhabited all vertical strata. Bigmouth buffalo schools in Lake Poinsett exhibited a free interchange of individuals. An evaluation of large mesh gill nets as a commercial fishery tool indicated that 10.0 cm bar measure gill nets …


Fish Populations Of Two Small Impoundments In Northeastern South Dakota, William C. Thorn Jan 1969

Fish Populations Of Two Small Impoundments In Northeastern South Dakota, William C. Thorn

Electronic Theses and Dissertations

Thirteen species and large standing crops of fish were found in Blue Cloud Abbey Pond and Labolt Pond, South Dakota. Adult population was estimated to be 5184 fish in Abbey Pond and 5016 in Labolt Pond. Composition of the populations differed. Black crappies were most numerous in Abbey Pond; white crappies, in Labolt Pond. Total standing crop of adult fish in Abbey Pond (573.1 kg/ha) was slightly greater than in Labolt Pond (550.6 kg/ha). Black crappies in Abbey Pond and white suckers in Labolt Pond were the species with highest standing crops. Growth of fish was more rapid in Labolt …


Effects Of Aldrin On Young Pheasants Under Semi-Natural Conditions, Ronald Eugene Thill Jan 1969

Effects Of Aldrin On Young Pheasants Under Semi-Natural Conditions, Ronald Eugene Thill

Electronic Theses and Dissertations

Effects of aldrin on young pheasants were studied under semi-natural conditions in four one-acre enclosures during the summer of 1968. The center two-thirds of each plot was planted in corn; remaining peripheral cover was maintained in smooth brome and alfalfa. Prior to planting, center portions of two plots were sprayed with 2 pounds of aldrin per acre on Hay 20, while remaining plots served as controls. On June 12, four family units consisting of two broody pheasant hens and two bantam hens with 15 three-day-old chicks each were confined in plots. Hens and broods were given free run 10 days …


An Evaluation Of The Roadside Technique For Censusing Breeding Waterfowl, Darrel W. Sauder Jan 1969

An Evaluation Of The Roadside Technique For Censusing Breeding Waterfowl, Darrel W. Sauder

Electronic Theses and Dissertations

An evaluation of the roadside technique for censusing breeding waterfowl was conducted in east-central South Dakota. On the 54-mile transect used in 1968, number of coutns necessary to be within 20 percent of population mean with specified confidence of 0.90 for blue-winged teal (Anas discors) and gadwall (Anas strepera) was five and three using miles or wetlands. Within same limits counts needed for mallard (Anas platyrhynchos) were at least four for miles and three for wetlands. Shorter transects, used in 1967 required more counts. Transects 21 miles long required up to 10 counts based on miles and 11 based on …


Cutthroat Flow Measuring Flumes For Flat Gradient Channels, Gaylord V. V. Skogerboe Jan 1969

Cutthroat Flow Measuring Flumes For Flat Gradient Channels, Gaylord V. V. Skogerboe

Reports

The cutthroat flume can operate either as a free or submerged flow structure. Submerged flow calibration curves and free flow equations have been developed. Rectangular cutthroat flume sizes of 1, 2, 3, 4, and 6 feet were studied and tested in the laboratory. Trapezoidal cutthroat flumes having zero (or V-shaped), 6-inch, and 12-inch throat widths were calibrated. The value of transition submergence is listed for each of the rectangular and trapezoidal cutthroat flumes. The most obvious advantage of a cutthroat flume is economy, since fabrication is facilitated by a flat bottom and removal of the throat section. Another advantage is …


Hydraulics Of Large Bed Element Channels, Harl E. Judd, Dean F. Peterson Jan 1969

Hydraulics Of Large Bed Element Channels, Harl E. Judd, Dean F. Peterson

Reports

No abstract provided.


An Historical Geographic Study Of The Virginia And Rainy Lake Company, The Last Major White Pine Operation In The Great Lakes Region, Duane A. Krenz Jan 1969

An Historical Geographic Study Of The Virginia And Rainy Lake Company, The Last Major White Pine Operation In The Great Lakes Region, Duane A. Krenz

All Graduate Theses, Dissertations, and Other Capstone Projects

This study involved one of the last large lumbering operations in the Great Lakes region which was located in northern St. Louis County in northeastern Minnesota. The Virginia and Rainy Lake Company, in fact, utilized the last major stand of virgin white pine in the Great Lakes region.


Simulation Of The Growth Of Even-Aged Stands Of White Spruce, Kenneth J. Mitchell Jan 1969

Simulation Of The Growth Of Even-Aged Stands Of White Spruce, Kenneth J. Mitchell

Yale School of the Environment Bulletin Series

No abstract provided.


On Temperature And Heat Flow In Tree Stems, Lee Pierce Herrington Jan 1969

On Temperature And Heat Flow In Tree Stems, Lee Pierce Herrington

Yale School of the Environment Bulletin Series

No abstract provided.


Land Use In The Kulin-Kondinin-Hyden District : Notes On A Recent Survey, D J. Carder Jan 1969

Land Use In The Kulin-Kondinin-Hyden District : Notes On A Recent Survey, D J. Carder

Journal of the Department of Agriculture, Western Australia, Series 4

A RECENT survey by the Department of Agriculture's Soil Conservation Service has highlighted the nature of the problems facing farmers with flooded or salt-affected land near salt lake country in the wheatbelt.


Aeration Of Stockade Lake, South Dakota, Larry C. Vanray Jan 1969

Aeration Of Stockade Lake, South Dakota, Larry C. Vanray

Electronic Theses and Dissertations

Intermittent aeration of Stockade Lake (2,470 acre feet) during the summers of 1967 and 1968 temporarily altered the thermal profile and phytoplankton density. Continual aeration for 48 hours in the deepest portion of this eutrophic lake produced epilmnetic cooling, hypolimnetic warming and apparent reduction of algal populations at three sampling stations in various parts of the lake. Dye, released at the aeration site, was found at all depths throughout the lake after 461/2 hours aeration. Air bubbles, rising from diffuser blocks near the lake bottom, carried cold, hypolimnetic water to the surface at a rate of 4.7 million gallons per …


Geophysical Institute Annual Report 1968-69, University Of Alaska Fairbanks. Geophysical Institute Jan 1969

Geophysical Institute Annual Report 1968-69, University Of Alaska Fairbanks. Geophysical Institute

GI Reports

The 1968–69 Geophysical Institute Annual Report presents an overview of the year’s scientific research achievements across the Institute’s disciplines, alongside operational summaries covering finances, administrative changes, and other key activities.


History Of The State Vermin Barrier Fences, Formerly Known As Rabbit Proof Fences, J S. Crawford Jan 1969

History Of The State Vermin Barrier Fences, Formerly Known As Rabbit Proof Fences, J S. Crawford

Research Reports

There is evidence of rabbits arriving in Australia as far back as 1788, and it is well known that others were liberated on islands around the coast, including some off the coast of Western Australia. However, they remained localised and it is now generally accepted that the rabbits which did spread originated from a small shipment of the wild type brought on the Clipper “Lightning” in 1859. They were released on “Barwon Park”, the property of Thomas Austin, near Geelong in Victoria, and within three years, had reached pest proportions


Analysis Of Small Water Management Structures In Irrigation Distribution Systems, Gaylord V. Skogerboe, Wynn R. Walker, Brent B. Hacking, Lloyd H. Austin Jan 1969

Analysis Of Small Water Management Structures In Irrigation Distribution Systems, Gaylord V. Skogerboe, Wynn R. Walker, Brent B. Hacking, Lloyd H. Austin

Reports

The Irrigation and Drainage Research Conference conducted at Utah State University (ASCE, 1964) delineated many of the research needs regarding “Small Low- Cost Hydraulic Structures for Conveyance and Distribution Systems,” which was one of the six topics considered at the conference. In discussing possibilities for accomplishing the recommended research, it was suggested by some panel members that a considerable portion of the work could be undertaken by graduate students, particularly at the Master of Science level. The intent of this report has been to sort through the large volume of literature in an attempt to define the specific research needs …


Formulation Of A Mathematical Model For The Allocation Of Colorado River Waters In Utah, Rick L. Gold, James H. Milligan, Calvin G. Clyde Jan 1969

Formulation Of A Mathematical Model For The Allocation Of Colorado River Waters In Utah, Rick L. Gold, James H. Milligan, Calvin G. Clyde

Reports

A Mathematical model for the allocation of Utah’s water resources is formulated in the linear programming format. The availability of water from various sources is considered with the demands for water in each of the nine hydrologic study areas of Utah. The applications of mathematical models of this type are studied and the merits of the linear programming approach are discussed.


Simulation Of The Hydrologic-Economic Flow System In An Agricultural Area, Murland R. Packer, J. Paul Riley, Harold H. Hiskey, Eugene K. Israelsen Jan 1969

Simulation Of The Hydrologic-Economic Flow System In An Agricultural Area, Murland R. Packer, J. Paul Riley, Harold H. Hiskey, Eugene K. Israelsen

Reports

Like the allocation of water resources among water users, the distribution of allocated water to the subusers requires an estimate of the economic costs and benefits from a number of distribution alternatives. The most satisfactory solution maximizes the benefit cost ratio. This study is based on the premise that equitable water distribution to agricultural subusers can be more easily accomplished through the use of a technique to predict the marginal value of agricultural water. A hydro-economic model is formulated to distribute the water supply to the crops and to determine the unit value of water for the given supply. By …


Controlled Water Releases To Improve Sauger Spawning Below Fort Randall Dam, Charles H. Wahlburg Dec 1968

Controlled Water Releases To Improve Sauger Spawning Below Fort Randall Dam, Charles H. Wahlburg

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

Studies by the North Central Reservoir Investigations show that good reproduction by Lewis and Clark Lake sauger is dependent on minimum water level change on spawning grounds. Sauger spawn 7 miles below Fort Randall Dam over a 4-mi1e long gravel, rubble, boulder shoreline. Spawning begins when water temperatures at the dam reach 42 F. This usually occurs during the latter part of April or early May. Sauger spawn along the shoreline in 1 to 2 ft of water from about 8:00 PM to 12:00 Midnight. Fertilized eggs sink to the bottom and adhere to gravel ~ rubble, and boulders. Most …


Species And Abundance Of Diurnal Raptors In The Panhandle Of Nebraska, John E. Mathisen, Ann Mathisen Dec 1968

Species And Abundance Of Diurnal Raptors In The Panhandle Of Nebraska, John E. Mathisen, Ann Mathisen

Nebraska Game and Parks Commission: Staff Research Publications

RECENT evidence of population declines for several species of raptors has been a subject of some concern both nationally and internationally. Although raptors are the most conspicuous birds in our environment, by virtue of their large size, flight habits, and food habits, little information is available to evaluate population densities and trends over large areas. Data are needed to provide yardsticks for judging population changes over time periods and among geographic areas.

This study was undertaken to provide information on the species and seasonal abundance of raptors in the panhandle of Nebraska for three years (1957 through 1959). Ten years …


The Prairie Naturalist Volume 1, No.4. December 1969 Dec 1968

The Prairie Naturalist Volume 1, No.4. December 1969

The Prairie Naturalist

EDITORIAL: Restoring Beauty to the Human Environment ▪ Paul B. Kannowski

A REQUIEM FOR THE PRAIRIE ▪ Hugh H. Iltis

BIRDING IN MY BACK YARD ▪ Mrs. George A. Anderson

OCCURRENCE OF THE CECROPIA AND ROCKY MOUNTAIN SILK MOTHS IN SOUTHWESTERN NORTH DAKOTA ▪ James Oberfoell


Effects Of Main Stem Impoundments And Channelization Upon The Limnology Of The Missouri River, Nebraska, Larry A. Morris, Ralph N. Langemeier, Thomas R. Russell, Arthur Witt Jr. Oct 1968

Effects Of Main Stem Impoundments And Channelization Upon The Limnology Of The Missouri River, Nebraska, Larry A. Morris, Ralph N. Langemeier, Thomas R. Russell, Arthur Witt Jr.

Nebraska Game and Parks Commission: Staff Research Publications

Rigid control has been imposed upon the Missouri River by impounding over one-half of the upper 1,500 miles and by channeling most of the remaining river within permanent, narrow banks. These controls have caused environmental changes in the lower Missouri River, as shown by this study, of adjacent unchannelized and channelized sections of river below the main stem impoundments. Impoundments have regulated flow by evening maximum and minimum discharges and improved downstream water quality by decreasing turbidity and indirectly raising the dissolved oxygen. In addition the impoundments have contributed a limnetic cladoceran, Leptodora kindti, to the drift and have …


L.A. General Data, Walter A. Lawrance Oct 1968

L.A. General Data, Walter A. Lawrance

Walter Lawrance Papers

No abstract provided.


Mill Pollution, Walter A. Lawrance Oct 1968

Mill Pollution, Walter A. Lawrance

Walter Lawrance Papers

No abstract provided.


Biochemical Activity, Walter A. Lawrance Oct 1968

Biochemical Activity, Walter A. Lawrance

Walter Lawrance Papers

No abstract provided.


Pool Studies, Walter A. Lawrance Oct 1968

Pool Studies, Walter A. Lawrance

Walter Lawrance Papers

No abstract provided.


Press Reports, Walter Lawrance Oct 1968

Press Reports, Walter Lawrance

Walter Lawrance Papers

No abstract provided.