WorldCat Identities

Seabergh, William C.

Overview
Works: 51 works in 112 publications in 1 language and 611 library holdings
Roles: Author
Classifications: TA7, 551.36
Publication Timeline
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Most widely held works by William C Seabergh
Physical model simulation of the hydraulics of Masonboro Inlet, North Carolina by Richard A Sager( Book )

4 editions published in 1977 in English and held by 84 WorldCat member libraries worldwide

This report is part of the General Investigation of Tidal Inlets 'Inlet Hydraulics Study.' The study involves the investigation of the tide- and wave-generated flow regime and water-level fluctuations in the vicinity of coastal inlets. Masonboro Inlet was selected as an inlet to be used in determining the usefulness and reliability of physical and mathematical models in predicting hydraulic characteristics of inlet/bay systems. This report presents results obtained from the physical model study. The Masonboro Inlet fixed-bed model, constructed to scales of 1:300 horizontally and 1:60 vertically, reproduced an area extending to the -45 ft contour in the Atlantic Ocean and to the nodal points in each interior channel. The wetlands were accurately reproduced near the inlet; but those areas farther bayward, being relatively flat, were reproduced schematically and artificially bent into the research flume to provide storage for the tidal prism. The model was equipped with appurtenances necessary for accurate reproduction and measurement of tides, tidal currents, waves, and other significant prototype phenomena. Model verification tests assured that the model hydraulic regimen was in satisfactory agreement with that of the prototype. Five velocity ranges with three stations at each range were verified in the model (readings were taken at three depths at each station); and seven tidal elevation gages in the ocean and bay were also verified
Prevention of shoaling at Little Lake Harbor, Michigan : hydraulic model investigation by William C Seabergh( Book )

8 editions published in 1982 in English and held by 81 WorldCat member libraries worldwide

Little Lake Harbor, Michigan, was constructed as a harbor of refuge for small craft on the south shore of Lake Superior. However, the existing breakwaters have not prevented a heavy influx of sediment into the entrance channel and shoaling makes navigation difficult and dangerous. A 1:75-scale (undistorted) hydraulic model, reproducing the harbor, breakwater structures, entrance channel, adjacent shoreline for 1 mile both east and west of the harbor, and underwater contours out to -30 ft, was used to investigate various plans proposed to minimize or eliminate channel shoaling. The model simulated wind waves, wave-generated currents, seiche action, seiche-generated currents, and the movement of sediment (by the use of a crushed coal tracer). From an analysis of prototype data on water-level variation in Lake Superior and the harbor basin, it was determined that seiche oscillations with periods near the inlet-bay Helmholtz period occurred frequently. These oscillations could generate velocities as high as 4.5 fps in the entrance channel, with a median velocity of 0.62 fps. Proposed measures to reduce channel shoaling were primarily concerned with the addition of a new structure on the east side of the entrance channel and/or extensions of the existing breakwaters
Improvements for Murrells Inlet, South Carolina : hydraulic model investigation : final report by Frederick C Perry( Book )

6 editions published in 1978 in English and held by 60 WorldCat member libraries worldwide

Murrells Inlet, located 13 miles southwest of Myrtle Beach, South Carolina, is a natural channel through a sandy beachline that conducts tidal flows between the Atlantic Ocean and a well-mixed lagoon of ocean salinity which has no source of freshwater inflow other than local surface runoff. The inlet provides passage from the ocean to docking facilities for charter craft, commercial fishing vessels, and private boats. However, due to the influx of sand into the inlet, an environment of shallow shifting-sand shoals and breaking waves produces difficult and dangerous navigation conditions. A project for the improvement and stabilization of the inlet was authorized in November 1971. A model study was performed to aid in preconstruction planning and design of structural solutions to the problem of providing a stabilized channel of sufficient depth and width with provisions for sand bypassing
Comparison of numerical and physical hydraulic models, Masonboro Inlet, North Carolina : Appendix 1, fixed-bed hydraulic model results by Richard A Sager( Book )

3 editions published in 1977 in English and held by 56 WorldCat member libraries worldwide

Improvements for Little River Inlet, South Carolina : hydraulic model investigation : final report by William C Seabergh( Book )

7 editions published in 1977 in English and held by 54 WorldCat member libraries worldwide

Little River Inlet, located near the State border of North and South Carolina, is part of the 'Grand Strand, ' a rapidly growing resort area along South Carolina's northeast shore. The inlet is a natural channel through the coastal barrier beach that conducts tidal flows between the Atlantic Ocean, inner channels, and a lagoon approximately 6 square miles in size. The inlet also provides a restricted passage for small-craft navigation from the ocean to the Atlantic Intracoastal Waterway (AIWW) and to private and commercial docking facilities. Improvements for the inlet were authorized on 12 October 1972 and included two jetties, sand transition dikes connecting the structures to the shore, a 300-ft-wide by 12-ft-deep entrance channel through the offshore bar, and a 90-ft-wide by 10-ft-deep inner channel from the entrance channel to the AIWW. A model study was performed to aid in preconstruction planning and design of the structures and included an investigation of items such as optimum alignment, length and spacing of the jetties, current patterns and magnitudes, sediment movement patterns, effects on the tidal prism, and effects on bay salinities
Supplementary tests of Masonboro Inlet fixed-bed model : hydraulic model investigation by William C Seabergh( Book )

7 editions published in 1980 in English and held by 50 WorldCat member libraries worldwide

Improvements for Masonboro Inlet, North Carolina : hydraulic model investigation, final report by William C Seabergh( Book )

2 editions published in 1976 in English and held by 48 WorldCat member libraries worldwide

Los Angeles Harbor Pier 400 harbor resonance model study by William C Seabergh( Book )

4 editions published in 1995 in English and held by 19 WorldCat member libraries worldwide

The Los Angeles - Long Beach Harbors physical model for harbor resonance was used to investigate the effects of Stages 1 and 2 of the Pier 400 Project on long waves (periods 30 - 500 sec) at existing and proposed berth locations. Three long-period wave spectra were selected for use. They included two storm conditions: 1 February 1986 and the Martin Luther King Day Storm on 17 January 1988. They were representative of long waves from the west. An average condition wave spectrum was developed based on long-term wave information and was representative of long waves from the south. These spectra were used to program the wave generators and wave data were collected at 77 harbor gages. Stage 1 was initially constructed and tested. No significant wave amplifications were noted at the Pier 300 berths with the solid fill causeway joining Terminal Island and Pier 400. When a 243.84-m- (800-ft- ) wide gap was opened in the causeway at the end of the Pier 300 channel, some increases in amplification were noted at Pier 300 though overall energy was still relatively low. Most existing berth locations had similar changes for Stages 1 and 2, with decreases in wave amplifications most prevalent. Some increases in wave amplifications as a result of the proposed construction in the Port of Los Angeles were noted at about 4 to 5 percent of the existing berth locations in the 25- to 40-sec and 41- to 205-sec energy bands and 10 per. cent for the 206- to 519-sec energy bands
Los Angeles and Long Beach Harbors model study : numerical analysis of tidal circulation for the 2020 Master Plan by William C Seabergh( Book )

4 editions published in 1984 in English and held by 17 WorldCat member libraries worldwide

A study to determine the effect of the proposed 2020 Master Plan on tidal circulation in Los Angeles and Long Beach Harbors was conducted using a numerical model with a two-dimensional depth-averaged formulation of the hydrodynamic equations. The model, which had been verified in a previous study, used an implicit finite-difference scheme to numerically solve the equations. To observe the dispersion of conservative substances, the model also incorporated the two-dimensional conservative constituent transport equations. The 2020 Master Plan consists of placing 2600 acres of landfill at various locations throughout the harbors. Tidal circulation was studied for 70-hr sequences of spring, mean, and neap tides for each of three harbor configurations: (1) existing configuration (1983), (2) landfills placed on existing bathymetry, and (3) landfills placed with increased channel depths. The 2020 Master Plan produced no changes in tidal elevation or phase throughout the harbors
Comparison of numerical and physical hydraulic models, Masonboro Inlet, N.C. ; Appendix 1 : Fixed-bed hydraulic model results by Richard A Sager( Book )

2 editions published between 1977 and 1978 in English and held by 16 WorldCat member libraries worldwide

Los Angeles and Long Beach harbors model study : Deep-Draft Dry Bulk Export Terminal, alternative no. 6: resonant response and tidal circulation studies by William C Seabergh( Book )

3 editions published in 1985 in English and held by 16 WorldCat member libraries worldwide

Improvements for Murrells Inlet, South Carolina : hydraulic model investigation by F. C Perry( Book )

3 editions published in 1978 in English and held by 15 WorldCat member libraries worldwide

Engineering assessment of hydrodynamics and jetty scour at Little River Inlet, North and South Carolina by Monica A Chasten( Book )

2 editions published in 1992 in English and held by 3 WorldCat member libraries worldwide

Little River Inlet is a shallow coastal inlet located on the Atlantic Ocean along the North Carolina South Carolina border. Construction by the US army Engineer District, Charleston (SAC) of a dual-jetty system at Little River Inlet began in March 1981 and was completed in July 1983. A detailed monitoring program conducted from 1979 through 1992 has documented the performance of the Little River Inlet project. A two-phase analysis of the monitoring data and navigation project was conducted by the Coastal Engineering Research Center (CERC). The objectives of the first phase analysis were to summarize beach and near shore response to the Little River Inlet navigation project and assist SAC in developing dredged material management plans (Chasten 1992). The second phase of analysis involved a reconnaissance-level review of the post-jetty thalweg evolution and stability, relative inlet hydrodynamics, and scour occurring at the jetty structures. This paper summarizes the second phase of the CERC study and performance of the Little River Inlet navigation project
Jetty Spurs at Coastal Inlets for Reduction of Navigation Channel Shoaling by William C Seabergh( Book )

4 editions published in 2003 in English and held by 2 WorldCat member libraries worldwide

The Coastal and Hydraulics Engineering Technical Note (CHETN) herein provides information on the effect of a jetty spur on the beachside circulation near a coastal inlet jetty and discusses introductory design considerations relating to alteration of water and sediment circulation near the beach side of jetties. Examples are presented from field and laboratory studies. A jetty spur may be defined as a short structure added to a jetty that flanks a navigation channel through an inlet. The spur will typically be nearly perpendicular to the jetty, but may be oriented at some angle with respect to the jetty in the range of 45 to 90 degrees. The spur may be added on the beach side of a jetty to prevent sediment from entering the inlet or may be placed on the channel side to divert the tidal current away from the jetty to reduce scour and possible jetty instability. This CHETN examines the design and performance of jetty spurs at Bakers Haulover Inlet, Florida, Fort Pierce Inlet, Florida, Siuslaw River Inlet, Oregon, Shark River, New Jersey, and Gray's Harbor, Washington. The report also includes results from a pilot study of spurs that was conducted at the Coastal Inlet Research Program's physical inlet model. The physical model facility is a large experimental basin (46 meters wide by 99 meters long) with an idealized inlet and smooth offshore contours. Short-period waves and tidal currents can be simulated in this facility. (1 table, 13 figures, 7 refs.)
Los Angeles and Long Beach Harbors Model Enhancement Program : long waves and harbor resonance analysis by William C Seabergh( Book )

3 editions published in 1999 in English and held by 2 WorldCat member libraries worldwide

Long period wave data have been collected at an offshore wave gauge and seven harbor gauges for over 8 years in the Los Angeles/Long Beach Harbor region. These data are being used in studies for the design of expansion of the harbors. In particular, the data have been used to select long period spectra for reproduction in a physical model of the harbors. The analysis of prototype wave data indicated correlation between the long wave spectrum and the short wave spectrum. Information was examined to determine the effect of the source of the short period waves (Southern Hemisphere swell, hurricanes, or winter storms, typically from the west) on the nature of the long period component of the waves. Relationships between the origin of the wave energy and long wave period were determined. Wave statistics were used to interpret effects of the energy level on the wave transformation into the harbors and correlate long wave and short wave spectra. Examination of a 5 to 22 sec short wave period and a 30 to 400 sec long wave period indicated correlation of smaller short wave periods with smaller long wave periods, and larger short wave periods with larger long wave periods. Observations of moored ship motion level was correlated to long wave energy in a harbor basin
Jetty spur functional design at coastal inlets : effects on nearshore circulation and potential sediment movement by William C Seabergh( Book )

3 editions published in 2006 in English and held by 1 WorldCat member library worldwide

This Coastal and Hydraulics Engineering Technical Note (CHETN) discusses the effects of connected and detached spurs on sediment transport and circulation in the vicinity of a coastal inlet jetty. The influence of spur orientation on the magnitude and pathways of these processes is detailed based on observations in the field and comprehensive laboratory measurements. A companion technical note, CHETN-IV-61 (Seabergh and Krock 2003), discusses existing jetty spurs in the United States and presents initial Coastal Inlet Research Program (CIRP) physical model jetty spur results
Weir jetties at coastal inlets by William C Seabergh( Book )

2 editions published in 2002 in English and held by 1 WorldCat member library worldwide

Improvements for Masonboro Inlet, North Carolina : hydraulic model investigation by William C Seabergh( Book )

3 editions published in 1976 in English and held by 1 WorldCat member library worldwide

Monitoring Barnegat Inlet, New Jersey, South Jetty Realignment( Book )

2 editions published in 2003 in English and held by 1 WorldCat member library worldwide

The objective of this monitoring at Barnegat Inlet was to determine the response of the inlet system to a new south jetty completed in 1991 that essentially parallels the existing north jetty. Barnegat Inlet is accessed by a large number of commercial, sport fishing, and recreational vessels each year. An unstable navigation channel and numerous accidents and deaths at Barnegat Inlet led to the construction of the new south jetty. The response of the new south jetty and inlet system was determined by data collection and monitoring and compared with design predictions. This new knowledge will contribute to improved jetty and inlet system design guidance, enhance construction of rubble-mound jetties, and develop better maintenance techniques for tidal inlets. The monitoring plan evaluated four fundamental hypotheses of the project design objectives: (a) the new south jetty and new channel alignment will not adversely affect tidal hydraulic response or high tide level in the inlet by system (i.e., no flooding problem), and prototype hydraulic response will be as predicted by a previous physical model evaluation; (b)the new south jetty realignment will improve navigation safety by stabilizing the navigation channel and depth between the jetties and over the outer bar (ebb tidal shoal), and will eliminate dredging in these regions; (c) the new south jetty will be structurally stable; and (d) the jetty system realignment will not adversely affect up coast or down coast beaches
 
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Alternative Names
Seabergh, W. C. (William C.)

Languages
English (73)