The Sedimentary Organisation and Behaviour of Drift-Aligned Gravel Barriers
Drift-aligned barriers formed of coarse clastic materials and described in terms of their organisational evolution at two levels, a) sorting and selection of clasts; b) development of...
Sorting Characteristics of Tidal Inlets
An hypothesis is presented as follows: Littoral processes at a tidal inlet remove a disproportionately higher quantity of fine grain sediment than coarse grain sediment from the littoral...
Numerical Modelling of Lower Lias Rock Failures in the Coastal Cliffs of South Wales
A model has been developed to evaluate slope failure in the interbedded limestone and mudstone Lower Lias series which outcrop for some 30 km in coastal South Wales. Computer simulation...
Mound Migration in Deeper Water and Methods of Categorizing Active and Stable Depths
Sustained shoreward migration of several dredged material disposal mounds, including one in 6-m depths off the Alabama coast, should encourage greater use of nearshore placement to conserve...
Complex Principal Component Analysis of Wave-Like Sand Motions
Complex Principal Component Analysis is applied to bathymetric data from the SUPERDUCK experiment at Duck, NC. This approach is shown to describe more of the variation with fewer functions...
Permeability of Cement Grout Plugs in Basaltic Rocks
Flow tests have been conducted on expansive cement grout plugs with diameters of 160 mm and 200 mm, and length-to-diameter ratios of one, in boreholes in basalt blocks, and in steel pipes....
Information Entropy and Environmental Engineering
Environmental engineering decisions are often made with limited information. In such cases it is useful to express uncertain quantities with a probability distribution. The use of information...
Pressure-Time Flow Measurements Under Adverse Conditions
Theoretical analyses suggest that the pressure-time method is capable of accurately determining flow rate in the short, varying cross section, 'semi-scroll' penstocks...
Measurements of Time Lag in Concrete Gravity Dam Foundations
Uplift measurements from eight large concrete gravity dams show that the time lag between an increase in headwater level and a corresponding increase in uplift pressure is insignificant....
Concrete Gravity Dam Cracking Analysis Methodology
This paper describes a methodology for the prediction and evaluation of cracking behavior in concrete gravity dam's for use in periodic safety investigations as outlined in...
Three Dimensional Modeling of Concrete Dams with Cracks Using Boundary Element Methods
Determining uplift pressure distributions in cracks in a concrete dam requires coupling between crack hydraulics and the stresses and displacements occurring in the rock and the concrete...
Avoiding Vibration in Penstocks
One objective of this paper is to indicate the potential sources of pressure pulsations within a hydraulic conduit system and the range of forcing frequencies associated with these sources....
Physical Hydraulic Modeling for Construction of New York State Dam Hydroelectric Project
The New York State Dam is located on the Mohawk River near its confluence with the Hudson River. Downstream from the dam, the river flow is divided into four main channels as the water...
Pressure Control Studies for PG&E's 20 MW Grizzly Hydroelectric Project
The Pacific Gas and Electric Company's Grizzly Hydroelectric Project consists of a single 20 MW Francis turbine under 700 feet head located near the existing Bucks Creek Project....
Pressure-Time Method Using Modern Practices
Over the past twenty years, Hydro-Quebec has modernized the pressure-time method of flow measurement, a method which is generally economical but sometimes difficult to apply. Starting...
Some Unusual Vibrations in Hydro Machinery
Most hydro machinery engineers have read the textbook cases of self-exited and flow induced vibrations. Usually such textbook vibrations are only found in the text book! In the real world,...
Application of Personal Computers to Field Flow Measurement
Flow measurements are often necessary to verify the performance of hydro turbines for regulatory, contractual, or engineering purposes. Historically, several methods utilizing various...
Hydrologic Impact of Reservoir Filling on a Fractured Crystalline-Rock Aquifer
A study of flow in and recharge to fractured rock has been initiated in conjunction with the construction and filling of a pumped-storage reservoir for a hydropower plant in the Blue Ridge...
Three-Dimensional Velocity Distribution at Open-Channel Diversions
A study is underway to develop an improved understanding of the 3-D flow pattern at 90? diversions. The main goal is to explain, via the velocity distribution, the behavior of sediment...
Temperature Rise, Bank Erosion, and Jet Velocity Effects of Submerged Multiport Diffusers in an Estuary
Temperature distributions, potential bank erosion, and jet velocity and trajectory of submerged multiport diffusers were predicted as part of the permitting process for an fossil fuel...
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