WorldCat Identities

Seabergh, William C.

Overview
Works: 75 works in 163 publications in 1 language and 1,105 library holdings
Roles: Author
Classifications: TA7,
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 )

3 editions published in 1977 in English and held by 83 WorldCat member libraries worldwide

Design for prevention of beach erosion at Presque Isle beaches, Erie, Pennsylvania : hydraulic model investigation by William C Seabergh( Book )

8 editions published in 1983 in English and held by 81 WorldCat member libraries worldwide

Presque Isle Peninsula, Erie, Pennsylvania, is a recurved sand spit with a lakeward perimeter of 9 miles that extends a protective arm around Erie Harbor. The peninsula provides 11 recreational beaches facing Lake Erie which are part of a State park that occupies almost the entire peninsula and contains an ecological reservation and numerous recreational facilities. Over the past 150 years, the integrity of the peninsula has been threatened by erosion of the beaches due to a decreasing sand supply, and numerous efforts to halt this erosion have been ineffective. A 1:50-scale (undistorted) physical hydraulic model was constructed to aid in evaluating the use of detached offshore breakwaters as a preventive measure against shoreline erosion. The model reproduced a 9,400-ft length of shoreline which included State Park Beaches 4, 5, and 6. These beaches contained a section of shoreline with an existing groin field and a reach of shoreline with few shoreline structures as it was desired to study the interaction of the proposed structures with both types of beaches
Prevention of shoaling at Little Lake Harbor, Michigan : hydraulic model investigation by William C Seabergh( Book )

7 editions published in 1982 in English and held by 80 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
Functional design of control structures for Oregon Inlet, North Carolina : hydraulic model investigation by Noel W Hollyfield( Book )

8 editions published in 1983 in English and held by 79 WorldCat member libraries worldwide

Oregon Inlet, the northernmost inlet through North Carolina's barrier islands known as the Outer Banks, is a natural channel conducting flow between the Atlantic Ocean and extensive open bay sounds. As is typical of many natural inlets, navigation through the inlet can be dangerous due to shallow shifting sand shoals. The necessity of continued maintenance dredging and the exposure of commercial and private craft to shoaling and breaking waves indicate that inlet stabilization by jetties is desirable and should be investigated. The design study for the Manteno (Shallowbag) Bay Project included construction and testing of a physical model of Oregon Inlet. Model testing included the study of jetty alignment, length, and spacing and the effects of the jetty structures on tidal exchange and on the flow through Bonner Bridge. It was concluded that the plan 2 jetty alignment with 2,500-, 3,500-, or 5,00-ft spacing would not negatively impact the tidal exchange, storm surge flows, or flow through Bonner Bridge. However, the larger spacings may permit bifurcation of the entrance channel or a more curvilinear channel
Weir jetty performance : hydraulic and sedimentary considerations : hydraulic model investigation by William C Seabergh( Book )

6 editions published in 1983 in English and held by 75 WorldCat member libraries worldwide

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

7 editions published in 1978 in English and held by 73 WorldCat member libraries worldwide

Comparison of numerical and physical hydraulic models, Masonboro Inlet, North Carolina : Appendix 1, fixed-bed hydraulic model results by Richard A Sager( Book )

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

Los Angeles and Long Beach Harbors Model Enhancement Program, effects of wind on circulation in Los Angeles-Long Beach Harbors by William C Seabergh( Book )

7 editions published in 1994 in English and Undetermined and held by 56 WorldCat member libraries worldwide

A previously calibrated numerical three-dimensional hydrodynamic model for Los Angeles-Long Beach Harbors, California, was applied to study the combined effects of tide and wind on circulation. The model was calibrated and verified successfully with field data for a summer wind condition. In this report the calibration is compared to a no-wind condition to understand the effects of typical wind conditions on circulation. Also, wind conditions for approaching (winds from the southeast) and passing (winds from the north) frontal systems, typical of fall-winter weather patterns, were simulated. Results indicated the effects of wind can be significant. Harbors, Long Beach Harbor, Wind-driven circulation. Hydrodynamics, Numerical models, Los Angeles Harbor, Tidal circulation
Improvements for Little River Inlet, South Carolina : hydraulic model investigation : final report by William C Seabergh( Book )

6 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 )

4 editions published in 1980 in English and held by 51 WorldCat member libraries worldwide

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

7 editions published in 1976 in English and held by 51 WorldCat member libraries worldwide

Los Angeles and Long Beach Harbors Model Enhancement Program, improved physical model harbor resonance methodology by William C Seabergh( Book )

5 editions published in 1993 in English and held by 51 WorldCat member libraries worldwide

Three long-period wave spectra were selected for use in the Los Angeles Long Beach Harbors physical models for harbor resonance studies. They included two storms: 1 February 1986 and the Martin Luther King Day Storm on 17 January 1988. An average condition wave spectrum was developed based on long- term wave information. These spectra were used to program the wave generators, and wave data were collected at seven harbor gages in the model where prototype data had been collected. A comparison of model and prototype data indicated good correlation. The model was constructed to the most recent harbor configuration and included Long Beach Harbor's Pier J expansion. Additional long-period wave data were collected at berth locations throughout the harbors for the three wave spectra conditions in order to have base data to compare with data collected for proposed plans of harbor development. This work will minimize time and cost for Los Angeles and Long Beach Harbors' harbor resonance studies. Harbor resonance, Long-period wave, Physical model
Wave breaking on a current at an idealized inlet, Coastal Inlets Research Program, inlet laboratory investigations( Book )

2 editions published in 1998 in English and held by 22 WorldCat member libraries worldwide

Laboratory measurements of wave shoaling and breaking on an ebb current were made in an idealized inlet in a wave basin. The experiment arrangement, procedures, and data analysis are described. The wave and ebb current measurements showed increased shoaling and breaking (compared to no current, shifting of the spectral peak to lower frequencies, and energy dissipation concentrated at the spectral peak and higher frequencies). The measurements were used to evaluate and develop formulations of wave dissipation on a current for application to a spectral wave model. Whitecapping dissipation formulations underpredicted breaking on a current in shallow water, whereas the bore-based wave dissipation relationship of Banjes and Janssen and a relationship developed in this study provided good estimates of wave-height decay on an ebb current Tables of the wave and current parameters are provided as an appendix
Effects of proposed harbor modifications on wave conditions, harbor resonance, and tidal circulation at Fish Harbor, Los Angeles, California : Physical and numerical model investigations by Robert R Bottin( Book )

3 editions published in 1985 in English and held by 19 WorldCat member libraries worldwide

The Port of Los Angles has embarked upon a program to improve wave and current conditions at Fish Harbor, Los Angeles, California. To achieve this, field measurements (both wave heights and currents) for the existing harbor were obtained and analyzed and a physical hydraulic model for short-period wave tests and numerical models for harbor oscillation and tidal circulation were used to investigate the effects of proposed harbor improvements. The proposed improvements consisted of dredging deeper channels and berthing areas to accommodate the larger, deeper draft vessels using the harbor and the creation of landfills to provide for expansion of local industry. An optimum improvement plan was developed during the physical model wave tests which met the established wave-height criteria and provided increased area for mooring small craft in the lee of the harbor breakwater. The results of the long-period prototype data analysis and numerical harbor oscillation study indicated a decrease in a long-period wave energy for this optimum plan. The tidal circulation study indicated that changes in tidal circulation characteristics were limited to the vicinity of Fish Harbor and included a slight shift in flood and ebb flow patterns due to breakwater location for the optimum plan. Tidal flushing in Fish Harbor was influenced by the optimum plan but was similar to existing conditions for successive low waters
Los Angeles Harbor Pier 400 harbor resonance model study by William C Seabergh( Book )

4 editions published in 1995 in English and held by 18 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
Comparison of numerical and physical hydraulic models, Masonboro Inlet, N.C. ; Appendix 1 : Fixed-bed hydraulic model results by Richard Allan Sager( Book )

2 editions published between 1977 and 1978 in English and held by 17 WorldCat member libraries worldwide

Los Angeles and Long Beach Harbors model study : numerical analysis of tidal circulation for the 2020 Master Plan by William C Seabergh( Book )

3 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
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 15 WorldCat member libraries worldwide

Tidal inlet equilibrium area experiments, inlet laboratory investigations by William C Seabergh( Book )

3 editions published in 2001 in English and held by 11 WorldCat member libraries worldwide

This study was designed to examine the relationship among channel area, tidal period, tidal prism, and maximum channel velocity. Movable-bed model experiments were run to define an equilibrium area for different tidal periods and sediments. The magnitude of the areas measured provided additional data for the relationship of the tidal prism versus minimum channel area in a size range slightly larger than previous laboratory data in the continuum to very large field inlets. These data may help define the tidal prism-minimum channel cross-sectional area relationship in the midrange channel size
Wave Breaking on a Current at an Idealized Inlet with an Ebb Shoal by Jane McKee Smith( )

2 editions published in 2001 in English and held by 0 WorldCat member libraries worldwide

In this report, wave breaking on a current is examined through physical-model measurements in an idealized inlet with a steady ebb current. Wave and current measurements will be used to evaluate wave dissipation models. The goal of the study is to provide the data to develop a dissipation function for wave breaking on a current that is based on integrated wave parameters, is applicable for arbitrary water depths, and is robust. The motivation for these laboratory experiments was to measure wave breaking in typical coastal inlet conditions. The measurements are being used to parameterize wave breaking for application in numerical wave transformation models, e.g., in the steady-state spectral wave model STWAVE. The data collected and analyzed for this study are an extension of the data set collected by Smith et al. (1998) in the same physical model facility. Smith et al. (1998) evaluated and developed dissipation algorithms using these data. It was found that whitecapping formulations, strongly dependent on wave steepness, generally under-predict dissipation. A relationship for dissipation as a function of wave height squared was developed which gave improved agreement between calculated and predicted dissipation compared to other work. The relationship also worked as well as others in modeling the wave height. The data presented in this report include a larger range of incident waves and ebb currents than the previous data set (Smith et al. 1998). These experiments also include an elliptical ebb shoal seaward of the inlet. The shoal induces depth-limited breaking (in addition to the current-induced breaking in the inlet), which is a typical feature of many coastal inlets. Also, an examination of effects of laboratory scaling was performed
 
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Alternative Names
Seabergh, W. C. (William C.)

Languages
English (91)