Knowledge Core Collection:https://hdl.handle.net/11681/467482024-03-29T04:52:01Z2024-03-29T04:52:01ZRadioisotopic sand tracer study, Point Conception, California : preliminary report on accomplishments : July 1966 - June 1968Duane, David B.Judge, Charles W.https://hdl.handle.net/11681/263342023-04-04T20:23:28Z1969-05-01T00:00:00ZTitle: Radioisotopic sand tracer study, Point Conception, California : preliminary report on accomplishments : July 1966 - June 1968
Authors: Duane, David B.; Judge, Charles W.
Abstract: The purpose of the Radioisotopic Sand Tracer (RIST) study is to develop and use radioactive tracer methods for research in sand movement and littoral processes. Research objectives include determination of suitable radioactive isotopes, development of mobile and stationary radiation detectors, and development of suitable handling and survey programs. Concurrent with these objectives, studies of sediment transport around the Point Conception headland and of the mechanics of littoral transport are being conducted. Methods developed by this program have direct application to engineering design of such works as harbor development and beach erosion prevention, and quasi-military application such as the location of radioactive or other toxic materials. To date, sand grains indigenous to the study area have been labeled with xenon-133 which does not adversely affect the hydraulic properties of the sand. Various devices and methods of employing the tagged sand have been studied. A mobile detector system using cesium iodide crystals and housed in a "ball" towed behind an amphibious vehicle detects the quantity and areas of radiation. Computer programs have been developed to correct and plot radiation data. A field test of equipment and principles at Cape Kennedy, Florida, were successful. Additional field tests were at Surf and Point Conception,
California. These tests included isotope distribution, sediment analysis, offshore profiles, and oceanic and atmospheric environment monitoring. In addition, model tests were conducted in the Shore Processes Test Basin at the Coastal Engineering Research Center (CERC) to compare high and low specific activity xenon, and to study beach development and movement under the controlled conditions of a hydraulic laboratory. The data density is sufficient to support tentative conclusions regarding offshore sediment movement in the Point Conception area. Additional field tests will extend the survey from the beach through the surf zone. In addition, development of instruments and field programs will continue in order to permit their routine use by technicians and field crews.
Description: Miscellaneous Paper1969-05-01T00:00:00ZLittoral environment observation program in California : preliminary report : February - December 1968Szuwalski, Andrehttps://hdl.handle.net/11681/263332023-04-04T20:23:17Z1970-02-01T00:00:00ZTitle: Littoral environment observation program in California : preliminary report : February - December 1968
Authors: Szuwalski, Andre
Abstract: This report describes the Littoral Environment Observation (LEO) Program, and assembles in one paper the data collected under the program from February through December 1968. LEO is a cooperative effort of the State of California and the Corps of Engineers to collect information which will increase understanding of the littoral processes and physical characteristics of the California shore. The littoral variables collected under the LEO program include the following beach characteristics: foreshore slope, width and elevation of berm, presence of cusps, and samples of the sediments. The beach samples are analyzed for mean and median diameter, standard deviation, skewness, and kurtosis. Sea variables include tide level, wave height, wave period, wave direction, type of breaker, direction and velocity of littoral currents, presence of rip currents, and water temperature. Wind velocity and direction are recorded, and panoramic photographs are obtained. The objective is to establish a bank of repetitive, systematic measurements of meteorological and oceanographic forces affecting the shoreline and the response of the shore to these forces. The data collected are being used as a base to analyze physical characteristics of the shoreline and the littoral processes affecting it.
Description: Miscellaneous Paper1970-02-01T00:00:00ZBeach profile changes east coast of Lake Michigan, 1970-72Davis, Richard A., Jr., 1937-Fingleton, W. G.Pritchett, Patricia C.https://hdl.handle.net/11681/255882023-04-04T20:22:59Z1975-10-01T00:00:00ZTitle: Beach profile changes east coast of Lake Michigan, 1970-72
Authors: Davis, Richard A., Jr., 1937-; Fingleton, W. G.; Pritchett, Patricia C.
Abstract: The primary result of this field study of beach changes on the eastern shore of Lake Michigan concerned the movement of the bluff or the edge of the terrace marking the landward boundary of the beach. Data collected every 4 weeks from August 1970 to August 1972 indicated recession or no change at each of 17 profile sites on a 250-mile segment of the east coast of Lake Michigan. During this period, lake levels were rising from a mean of 578.9 feet above mean water level (MWL) in 1970 to 579.7 feet MWL in 1972. The maximum bluff erosion at any one site between monthly surveys was 20 feet at profile 4 in June 1972. Variables affecting the rate of movement of the bluff include lake level, composition of the bluff or terrace, orientation and straightness of shoreline, wave climate, manmade structures, and possibly longshore bars. There was a lack of correlation between bluff erosion at nearby stations, but each site varied seasonally with maximum erosion occurring in late fall when storm occurrence is also high. Shore ice protected the beaches in winter; erosion resumed in spring at a reduced level. Beach width from the base of the bluff to the water level .at the time of the survey also varied seasonally, with beaches narrow in early summer when lake level is at a maximum and wider in late fall when lake level is at a lower level. The study beaches were mostly well-sorted sand (mean grain size between 0.330 to 0.189 millimeter or 1.60 and 2.40 phi units) ;with some gravel and heavy mineral concentrations.
Description: Miscellaneous Paper1975-10-01T00:00:00ZA selected bibliography of the nearshore environment : Florida west coastSaloman, Carl H.https://hdl.handle.net/11681/255872023-04-04T20:22:33Z1975-04-01T00:00:00ZTitle: A selected bibliography of the nearshore environment : Florida west coast
Authors: Saloman, Carl H.
Abstract: A collection of over 2,900 references on ecological and coastal engineering subjects related to the nearshore environment of. the Florida west coast. References are grouped by subject and alphabetized by author within each subject heading.
Description: Miscellaneous Paper1975-04-01T00:00:00Z