| Flow Table Study of Cook Inlet, Alaska |
JUL 2003 |
173 pages |
| Authors:
Steven A. Hughes; Gian-Marco Pizzo; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICSLAB
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 | Complex flow patterns in upper Cook Inlet in the vicinity of the Port of Anchorage re simulated using a flow table. Initially, two idealized models of the inlet were constructed with terraced layers representing the bathymetry. Encouraging test results prompted construction of a model with three-dimensional bathymetry. Both ebb and flood maximum tide flows could be examined by reversing the models on the flow table. The intriguing flow patterns of ... |
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| Monitoring of the Yaquina Bay Entrance, North Jetty at Newport, Oregon; Summary and Results |
JUL 95 |
459 pages |
| Authors:
Steven A. Hughes; Terri L. Prickett; Michael W. Tubman; William D. Corson; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| The rubble-mound north jetty protecting the entrance to Yaquina Bay has experienced appreciable damage throughout its long service history. Since 1966 the north jetty has been rehabilitated twice after severe winter storm waves eroded the seawardmost 140 m (460 ft) of the jetty head. After the most recent rehabilitation in 1988 a 6-year jetty monitoring effort was initiated under the Corps of Engineers' Monitoring of Completed Coastal Projects Program. Principal ... |
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| Scour Hole Problems Experienced by the Corps of Engineers; Data Presentation and Summary |
MAR 93 |
80 pages |
| Authors:
W. J. Lillycrop; Steven A. Hughes; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| The hydromechanics involved in scour hole development encompass many interrelated process. Singularly, some of these processes are well understood and often quantifiable (tides, tidal currents, and waves). Other processes such as sediment transport and wave/current/structure interactions are less understood but perhaps just as important in scour hole development. Why does a scour hole form a tip of one jetty (of a two-jetty system) and not at the other, such as ... |
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| Large Centrifuge: A Critical Army Capability for the Future |
MAY 91 |
117 pages |
| Authors:
Richard H. Ledbetter; Steven A. Hughes; Marian P. Rollings; Charles R. Lee; Paul A. Gilbert; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
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| The purpose of this report is to present an overview of potential applications of a centrifuge for the purposes of research and development. The technical areas discussed are (a) coastal regions, (b) environmental protection, (c) geotechnical, (d) hydraulic, (e) structural, and (f) cold regions. This report discusses those areas where centrifuge testing would greatly benefit research objectives, particularly in cases where prototype data are very expensive if not impossible to ... |
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| Midscale Physical Model Validation for Scour at Coastal Structures |
JUN 90 |
196 pages |
| Authors:
Steven A. Hughes; Jimmy E. Fowler; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| A 1-to-7.5 scale (midscale) movable-bed physical model was used to validate model scaling criteria selected as most appropriate for turbulence- dominated erosion of sediment by waves. Two-dimensional flume tests successfully reproduced profile evolution observed in prototype-scale wave flume tests conducted under both regular and irregular wave conditions. For the case of regular waves, a sloping concrete revetment was exposed, thus validating the scaling guidance for use in studying scour at ... |
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| Laboratory Measurement of Spatial and Temporal Suspended Sediment Concentration Under Waves |
JAN 88 |
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| Authors:
Steven A. Hughes; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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 | This study examines the feasibility of obtaining spatial and temporal suspended sediment concentrations in the laboratory through the use of high- speed filming and image analysis. A series of filming experiments was conducted in a laboratory wave flume to investigate filming parameters and to determine optimum conditions for filming high quality footage of sediment transport. A relatively simple procedure is used to map the contours of light intensity returned from ... |
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| DUCK85 Photopole Field Experiment |
NOV 87 |
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| Authors:
Bruce A. Ebersole; Steven A. Hughes; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| A field study was conducted at the Coastal Engineering Research Center's Field Research Facility in Duck, North Carolina, during the fall of 1985. The photopole experiment was one component of the overall study. Synchronized 16 mm movie cameras were used to film the propagation of waves past a shore-perpendicular transect of brightly painted poles. The film was developed and the photographic images were digitized to obtain the time variation of ... |
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| A User's Guide to SHALWV: Numerical Model for Simulation of Shallow- Water Wave Growth, Propagation, and Decay |
JUN 86 |
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| Authors:
Steven A. Hughes; Robert E. Jensen; COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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| SHALWV is a numerical model that simulates shallow-water wave growth, propagation, and decay in a directional spectrum over an arbitrary bathymetry. It is a time-dependent model requiring a primary input of the wind speed and wind direction at each grid point. Part I of this report contains an overview of SHALWV consisting of the model description, the theoretical background, and the model applications and limitations. Part II provides the information ... |
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| The Effect of Submerged Norfolk Bar on Wave Conditions |
31 MAY 83 |
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| Authors:
Steven A. Hughes; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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| The purpose of this study was to examine, through use of a mathematical model, the alterations in the wave climate caused by a submerged offshore bar (offshore Virginia Beach/Norfolk). Conclusion was that in all cases a phase lag developed as the wave passed over the bar, resulting in wave refraction around the ends of the bar. The refraction appeared to be relatively minor with little noticeable effect on the adjacent ... |
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