WorldCat Identities

Coastal and Hydraulics Laboratory (U.S. Army Engineer Waterways Experiment Station)

Overview
Works: 261 works in 433 publications in 1 language and 2,731 library holdings
Genres: Technical reports  Academic theses 
Classifications: TA7, 627
Publication Timeline
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Most widely held works by Coastal and Hydraulics Laboratory (U.S. Army Engineer Waterways Experiment Station)
Periodic inspections of Kahului and Laupahoehoe breakwaters, Hawaii : armor unit monitoring for period 1992/93-2001 by Robert R Bottin( Book )

2 editions published in 2002 in English and held by 121 WorldCat member libraries worldwide

Selected coastal navigation structures are periodically monitored under the "Periodic Inspections" Work Unit of the monitoring Completed Navigation Projects Program. Such monitoring is done to gain an understanding of the long-term structural response of unique structures to their environment. Periodic data sets are used to improve knowledge in design, construction, and maintenance of both existing and propose coastal navigation projects. The Kahului Harbor breakwaters and the Laupahoehoe boat-launching facility breakwater, HI, were nominated for periodic monitoring by the U.S. Army Engineer District, Honolulu. The positions of the above-water, concrete armor units (tetrapods, tribars, and/or dolosse photogrammetric analysis. The structures were revisited in 2001 to determine changes that had occurred. Results indicated that some armor units had moved along the seaward quadrant of the head of the Kahului east breakwater. These units were intact, however, and are still functional. Armor unit movements on the Kahului west breakwater and the Laupahoehoe breakwater were minimal. A detailed inventory of broken armor units on these structures was obtained. The sites will be revisited in the future and the long-term structural response of the structures to their environment will continued to be tracked. These data sets will facilitate engineering decisions concerning whether or not closed surveillance and/or repair of the breakwaters might be required to reduce their chances of failing catastrophically. The periodic inspection methods developed and validated for the Hawaii breakwaters may also be used to gain insight into other Corps structures
Model study of Marmet Lock filling and emptying system, Kanawha River, West Virginia : hydraulic model investigation by John E Hite( Book )

4 editions published in 1999 in English and held by 121 WorldCat member libraries worldwide

Navigation conditions in lower lock approach of Ice Harbor Lock and Dam, Snake River, Washington by Howard Park( Book )

2 editions published in 2002 in English and held by 115 WorldCat member libraries worldwide

Possible construction of facilities to improve passage of juvenile and adult migratory fish at Ice Harbor Lock and Dam on the Snake River, Washington, caused concern over the impacts to navigation especially in the lower lock approach. A 1:55-scale physical model of the project was used to help identify these impacts. Navigation conditions in the lower lock approach were determined for various discharges and barge configurations of rock dikes placed in the lower lock approach. The study revealed that the installation flow deflectors at Ice Harbor Dam caused adverse impacts to navigation in the lower lock approach. An intense eddy formed near the downstream guard wall, and the angle magnitude of the crosscurrent in the lower lock approach were larger than those with the no-deflector conditions. Several alternatives included the placement of four, 40-ft-diam circular cells, 120-ft on center, located downstream, parallel, and riverward of the lower guard wall
Salinity changes in Pontchartrain Basin Estuary, Louisiana, resulting from Mississippi River-Gulf outlet partial closure plans with width reduction( Book )

1 edition published in 2002 in English and held by 111 WorldCat member libraries worldwide

The Mississippi River-Gulf Outlet (MRGO) consists of a ship channel 36 ft deep and 500 ft wide, extending approximately 76 miles from the juncture of the Inner Harbor Navigation Channel and the Gulf Intracoastal Waterway in New Orleans, LA, to the -38 mlw (mean low water) -ft contour in the Gulf of Mexico, The purpose of the MRGO is to provide a deep-draft channel to the Port of New Orleans Inner Harbor Facilities. Since the MRGO's completion in January 1968, saltwater flux from the MRGO through direct connections to Lake Borgne and the Gulf Intracoastal Waterway has contributed to an increase in the salinity concentration of the lakes and Biloxi Marshes. This report presents the results of a numerical mode investigation used to predict average salinity changes that will occur in the Lake Pontchartrain Basin as a result of varying levels of depth and width closure of the MRGO below Lake Borgne. This report follows a previous study, ERDC/CHL TR-01-14, that modeled depth closure alone, which produced very low changes in salinity
Joint wind wave height-frequency-direction statistics at two disparate sites : final report by Charles E Long( Book )

6 editions published in 1998 in English and held by 78 WorldCat member libraries worldwide

Joint probability functions associating wind wave characteristics height, spectral peak frequency, and mean wave direction at the peak frequency are estimated based on observations at two sites with distinctively different wave climates. One of the data sources is a directional wave gauge in approximately 8-m water depth 900 m offshore of the U.S. Army Engineer Waterways Experiment Station Coastal and Hydraulics Laboratory Field Research Facility on the northern Outer Banks of North Carolin & The other data source is a directional wave gauge mounted on the Texaco Oil Company production facility known as Harvest Platform located in about 200 m of water approximately 20 km west of Point Conception, California The objective is to provide a simple three-parameter statistical characterization of these two sites so that meaningful combinations of these parameters can be used with conventional coastal engineering analysis tools. In addition to three-parameter joint statistics, marginal distributions with wave height-frequency, and joint height-direction are also presented
CORE-LOC concrete armor units : final report by Jeffrey A Melby( Book )

6 editions published in 1997 in English and held by 74 WorldCat member libraries worldwide

A new series of coastal rubble structure concrete armor units called CORE-LOC has been developed at the Coastal Engineering Research Center, U.S. Army Engineer Waterways Experiment Station. CORE-LOC units have been designed for random placement in a single layer on steep or shallow slopes. CORE-LOC shapes have been optimized to maximize hydraulic stability, unreinforced strength, and reserve stability, but minimize on slope volume and casting yard space. CORE-LOC is designed to interlock well with dolosse so that it can be used as a repair unit. While several different CORE-LOC shapes have been developed, this report discusses preliminary hydraulic stability tests of the middle aspect ratio. Finite element studies of CORE-LOC showed maximum flexural tensile stresses to be 47 percent, 74 percent, and 33 percent those of dolosse, accropode, and tribar, respectively. Torsional stresses were 54 percent, 74 percent, and 38 percent those of dolosse, accropode, and tribar, respectively. Initial two-dimensional hydraulic stability tests of the CORE-LOC shape indicate that the unit is one of the most stable randomly placed armor units ever tested, withstanding breaking wave heights 5 to 7 times the maximum dimension of the unit on slopes of 3V:4H and 1V:1.5H
Results of monitoring study of Agat Harbor, Guam by David D Mcgehee( Book )

3 editions published in 1997 in English and held by 67 WorldCat member libraries worldwide

Agat Harbor, Guam, was selected for monitoring under the Monitoring of Coastal Projects Program, which is sponsored by Headquarters, U.S. Army Corps of Engineers. During a 3-year observation period, the following data were collected: a. Directional energy spectra and surface winds from an offshore site. b. Energy spectra at several locations on a shore-normal transect across the reef flat. c. Wave conditions and water elevations at the structure and harbor response during large wave events. d. Directional energy spectra at the outer boundary of the model and at several sites within the harbor. e. Energy spectra at the outer and inner ends of the channel. f Periodic site inspections and aerial photographs of the harbor and surroundings. Most of the quantitative objectives of the study were not met because of the lack of measured data during high-energy events. However, observations have resulted in valuable qualitative information that should be considered when planning or designing projects in a similar environment
Burns Harbor, Indiana, monitoring study : final report by David D Mcgehee( Book )

7 editions published in 1997 in English and held by 65 WorldCat member libraries worldwide

Reliability assessment of breakwaters by Jeffrey A Melby( Book )

3 editions published in 1997 in English and held by 65 WorldCat member libraries worldwide

In this report, several level II reliability techniques are discussed and applied to breakwater design. Using these methods, the reliability and reliability index are determined for the dominant performance functions of a breakwater including stone and concrete armor stability, concrete armor structural response, runup, and overflopping. The methods include Taylor series finite difference (TSFD) methods, which are shown to be easily computed using a handheld calculator or spreadsheet. The TSFD method is shown to yield reasonable accuracy for preliminary comparison of various alternatives. An invariant iterative TSFD method and associated FORTRAN program are shown, which provide an improved approximation to the reliability for design and evaluation purposes
Los Angeles and Long Beach harbors model enhancement program : prototype wave data summary : final report by James Rosati( Book )

5 editions published in 1998 in English and held by 63 WorldCat member libraries worldwide

This report presents data products from the analysis of seven different wave gauges in Los Angeles and Long Beach Harbors and a directional wave gauge at a nearby offshore site (Platform Edith). These data products were chosen in an effort to summarize all wave data collected during the Harbors Model Enhancements (HME) Program. Data acquisition methods and equipment are documented in this report, along with analysis methods. The emphasis of this report is on summarizing and documenting the available prototype wave data in fulfillment of the wave data collection and analysis tasks of the HME. Between February 1984 and February 1988 wave data were sampled every 2 hr at 1 Hz for 2,048 sec in the harbors. From February 1988 to August 1991, data were collected continuously in the harbors at an average sample rate of 0.25 Hz. Directional wave data were measured offshore at Platform Edith via a PUV gauge between February 1985 and August 1991. Data for this period were collected at 1 Hz for 2,048 sec every hour but reported every 4 hrs. Waves were measured in seven locations in the harbors with highly accurate single-point pressure sensors. Directional wave measurements show that during the winter months most of the waves come from the west, but during the summer, the majority of the waves come from the south (although a significant number still come from the west) and average peak in wind wave energy during the months of September and October. However, low-frequency waves that affect ship motion are present throughout the year
SBEACH : numerical model for simulating storm-induced beach change by Magnus Larson( Book )

1 edition published in 1998 in English and held by 49 WorldCat member libraries worldwide

Damage prog[r]ession on rubble-mound breakwaters by Jeffrey A Melby( Book )

3 editions published in 1999 in English and held by 47 WorldCat member libraries worldwide

This report addresses depth-limited breaking-wave damage on rubble-mound breakwaters. Few generalized studies have been conducted on this topic; so no engineering methods exist for determining deterioration rates of breakwaters exposed to sequences of storms. A new experiment is discussed measuring incipient motion on both stone and sphere armor layers. An incipient motion criterion is derived for the dominant mode of motion: vertical lift under the steep breaking-wave face. Previous breakwater damage experiments and measurement techniques are thoroughly reviewed. A new experiment is described consisting of seven relatively long-duration breakwater damage test series. The test series were conducted in a flume using irregular waves. Wave height, wave period, water depth, storm duration, storm sequencing, and stone gradation were varied systematically. The experiment yielded relationships for both temporal and spatial damage development Maximum eroded depth, maximum eroded length, and minimum remaining cover depth are introduced to describe the damaged profile. The mean and standard deviation of these profile parameters are shown to be a function of mean eroded area. An equation is also provided to predict the standard deviation of eroded area as a function of mean damage. Relations for predicting temporal variations of mean eroded area with wave height and period varying with time in steps are shown to describe damage reasonably well
Study of navigation channel feasibility, Willapa Bay, Washington by Nicholas C Kraus( Book )

5 editions published between 2000 and 2002 in English and held by 43 WorldCat member libraries worldwide

This report represents results of Phase II of a study performed for the U.S. Army Engineer District, Seattle, to determine the technical feasibility of maintaining a reliable bar or entrance navigation channel into Willapa Bay, Washington. The study was authorized by the Seattle District in cooperation with the Port of Willapa Harbor under a Partnering Agreement. The Phase I study was an intensive effort to understand the physical processes at the study site, collect data, and establish numerical simulation models of the waves and currents at the entrance. Numerous alternatives for creating and maintaining the most reliable entrance channel were also identified and screened. The Phase II study describes the results of ongoing monitoring of the existing natural navigation channel, changes in bathymetry, and refinements to the numerical models. Also included is an application of the monitoring and modeling technology to the entrance channel leading from Willapa Bay to Bay Center, a small fishing harbor. The entrance area of this shallow-draft navigation channel served as a convenient surrogate for improving the predictive technology, as well as advancing understanding of sediment transport processes in the bay and the deep Willapa Bay entrance channel
Directional irregular wave kinematics by Christopher H Barker( Book )

3 editions published in 1998 in English and held by 42 WorldCat member libraries worldwide

Coastal and ocean processes are heavily influenced by the kinematics of waves. In order to understand these processes, researchers place a variety of instruments in the sea in an attempt to measure the waves. These instruments all measure a small set of physical quantities at a small number of locations. The balance of the kinematics must be predicted through analysis of the measured records. Most of the currently used methods of analysis rely on the superposition of linear waves to recreate complex seas. These methods are compromised by linearizing approximations to the free surface boundary conditions. Fidelity in the interpretation of wave measurements is enhanced by insisting that the analysis satisfies the full nonlinear free surface boundary conditions
Inspections of previously monitored coastal structures by Robert R Bottin( Book )

3 editions published in 1999 in English and held by 40 WorldCat member libraries worldwide

This report presents results of inspections of coastal structures monitored previously under the Monitoring Completed Navigation Projects (MCNP) Program. Expedient, low-cost inspections consisting of walking inspections and/or boat surveys were performed at 14 sites. Positions of breakwater and jetty armor units were compared with their positions in previous aerial photography and photogrammetric surveys. Settlement of portions of the structures as well as voids in their armor also were noted, and photographs of the structures were obtained. Summaries of the inspection results as well as recommendations are presented in this report. The work was conducted under the "Periodic Inspections" work unit of the MCNP program
Periodic inspection of jetties at Manasquan Inlet, New Jersey : armor unit monitoring for period 1994-1998 by Robert R Bottin( Book )

3 editions published in 1999 in English and held by 39 WorldCat member libraries worldwide

Under the Periodic Inspections work unit of the monitoring Completed Navigation Projects Program, precise locations of dolos armor units on the Manasquan Inlet, New Jersey, jetty heads were reestablished and compared with data obtained previously. The vertical and horizontal positions of the dolosse were defined through limited ground surveys, low-altitude aerial photography, and photogrammetric analysis. Areas at the seaward heads of the structures were recently rehabilitated with CORE-LOC armor units. Base data were obtained relative to the precise vertical and horizontal positions of the CORE-LOCs. A broken armor unit survey also was completed. The site will be revisited periodically in the future, and the long-term response of the breakwater to its environment will be tracked. These periodic data sets will be used to improve knowledge in the design, construction, and maintenance of the existing structure as well as future coastal projects
Infragravity waves in the nearshore zone by Kent K Hathaway( )

2 editions published in 1998 in English and held by 39 WorldCat member libraries worldwide

This report summarizes the present state of knowledge on infragravity wave motions (nominally 0.003 to 0.05 Hz). Theoretical and observational studies are presented. Most of the studies discussed herein have been published elsewhere, however a few studies discussed in chapter 4 are presented for the first time in this report Measurements of nearshore waves and currents have shown that a significant amount of the total energy can be contained in the infragravity band, and on highly dissipative beaches the infragravity wave variance often dominates over energy in the incident wave band(0.05 to 0.3 Hz). An 8-month data set of infragravity variance measured at 8-m-depth at the shoreline (runup) was compared with incident wave variance. Analysis of the 8-m-depth data showed that high mode edge waves account for about 50 percent of the total infragravity variance, and as high as 80 percent at times. Significant edge wave heights greater than 20 cm were observed at the 8-m depth. Infragravity wave variance was shown to have a higher correlation with swell variance (C = 0.95) than with sea variance (C = 0.61). This report was motivated, in part, by the need to determine the significance of infragravity waves on coastal erosion and structure damage and by the desire to improve coastal engineering solutions to problems associated with nearshore processes
Monmouth Beach, New Jersey : beach-fill "hot spot" erosion evaluation by S. Jarrell Smith( Book )

3 editions published in 1999 in English and held by 38 WorldCat member libraries worldwide

Salinity changes in Pontchartrain Basin Estuary resulting from Bonnet Carré freshwater diversion : numerical model investigation by William H McAnally( Book )

3 editions published in 1997 in English and held by 35 WorldCat member libraries worldwide

One purpose of the diversion is to reduce salinities in the Biloxi Marshes by 2 to 8 parts per thousand (ppt) in order to improve oyster productivity. A range of monthly salinities has been identified as the desired product of the project. Those salinities, called the Chatry salinities in this report, consist of a narrow band of 'optimum' salinities and a somewhat wider band of 'range limits.' A time varying, three dimensional numerical model of the estuary was constructed using the U.S. Army Corps of Engineers TABS-MD modeling system. The modeled area included Lakes Maurepas, Pontchartrain, and Borgne, Biloxi Marshes, and a portion of Chandeleur Sound plus connecting waterways of Mississippi River Gulf Outlet (MRGO), Inner Harbor Navigation Canal, Gulf Intracoastal Waterway, Chef Menteur, and The Rigolets. All major tributary freshwater flows were simulated, as were tides at the Gulf of Mexico boundary and winds. The model computed instantaneous water levels and current velocities and salinities in three spatial dimensions throughout the area modeled. The model was verified to satisfactory reproduce hydrodynamic behavior observed in the natural system in 1982 and 1994. Four conditions were modeled for April through August of a typical year: a Base condition with no diversion, Plan RT with freshwater diversions up to 20,000 cfs, Plan MBP5 with freshwater diversions up to 8,500 cfs, and Plan LBCl, with no freshwater diversions but with the connections between the MRGO and Lake Borgue closed. The numerical model results were used to construct a simple regression equation that relates Biloxi Marsh salinities at a point to freshwater flows from the natural tributaries plus the diversions. The equation was then used to develop other diversion schedules that offered various salinity reduction scenarios
Model study of St. Stephen Powerhouse Fish Passage Facilities, Cooper River Rediversion Project, South Carolina by John E Hite( Book )

5 editions published in 1998 in English and held by 34 WorldCat member libraries worldwide

This report documents a model study of the St. Stephen Power Plant, located in Berkely County, South Carolina. A previous model study revealed that the fish lift at the powerhouse could be improved by providing auxiliary attraction flows to the fish entrances. An auxiliary attraction flow (AAF) system was proposed that uses a siphon to obtain the auxiliary attraction water from the reservoir. The model investigations reported herein address the flow conditions at the discharge end of the siphon; the hydraulic aspects of the siphon are not addressed. Three different models were used to evaluate flow conditions at the discharge end of the AAF system. A 1:25-scale model of the St. Stephen powerhouse was used to improve the fish entrance conditions and to evaluate the outlet conditions for the initial AAF system. As the investigations progressed, the design of the siphon discharge system was modified to include downstream fish migration and debris passage
 
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Alternative Names

controlled identityCoastal and Hydraulics Laboratory (Engineer Research and Development Center (U.S.))

controlled identityCoastal Engineering Research Center (U.S.)

controlled identityHydraulics Laboratory (U.S.)

CHL

CHL (Coastal and Hydraulics Laboratory (U.S. Army Engineer Waterways Experiment Station))

U.S. Army Engineer Waterways Experiment Station. Coastal and Hydraulics Laboratory

Waterways Experiment Station Coastal and Hydraulics Laboratory

WES Coastal and Hydraulics Laboratory

Languages
English (70)