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Articles 1 - 7 of 7
Full-Text Articles in Hydraulic Engineering
Wave Attenuation Through Submerged Oyster Aquaculture Cages, Liam T. Hanley
Wave Attenuation Through Submerged Oyster Aquaculture Cages, Liam T. Hanley
Electronic Theses and Dissertations
Coastal erosion presents a growing issue to shorelines around the world and is especially harmful to Maine, a region where sea-level rise is higher than the global average. Green and hybrid coastal defense strategies are being implemented around the country to provide sustainable, habitat-friendly solutions to erosion control. Maine is a hotspot for commercial aquaculture, with an estimated $13.6 million economic impact. This study looks to bridge the gap between Maine aquaculture and the living shorelines initiative, by determining the wave attenuating properties of submerged oyster cages. The project will be able to inform local oyster farmers, resource planners, and …
Anthropogenic Effects On Tidal Distortion In A Tidal River, Matthew D. Fischer
Anthropogenic Effects On Tidal Distortion In A Tidal River, Matthew D. Fischer
Electronic Theses and Dissertations
Tidal rivers are landward portions of estuarine systems constituting the union between coastal, tidally controlled settings and rivers, where fluvial processes dominate. In these reaches, river discharge (mean flow) and tides are the two most important mechanisms in controlling geophysical flows. The processes governing water levels and current amplitudes in tidal rivers are highly nonlinear and modulated by external forcings- thus requiring sophisticated techniques for accurate prediction and forecasting. Physical oceanographers and estuarine physicists tend to limit their study area to the maximum extent of the horizontal tide (salinity intrusion), not the most landward point influenced by tidal water levels. …
Three-Dimensional Bedrock Channel Evolution With Smoothed Particle Hydrodynamics, Nick Richmond
Three-Dimensional Bedrock Channel Evolution With Smoothed Particle Hydrodynamics, Nick Richmond
Electronic Theses and Dissertations
Bedrock channels are responsible for balancing and communicating tectonic and climatic signals across landscapes, but it is difficult and dangerous to observe and measure the flows responsible for removing weakly-attached blocks of bedrock from the channel boundary. Consequently, quantitative descriptions of the dynamics of bedrock removal are scarce. Detailed numerical simulation of violent flows in three dimensions has been historically challenging due to technological limitations, but advances in computational fluid dynamics aided by high-performance computing have made it practical to generate approximate solutions to the governing equations of fluid dynamics. From these numerical solutions we gain detailed knowledge of the …
The Dynamics Of Mixing And Subtidal Flow In A Maine Estuary, Kristopher Bears
The Dynamics Of Mixing And Subtidal Flow In A Maine Estuary, Kristopher Bears
Electronic Theses and Dissertations
Long-term material transport in estuaries is largely controlled by subtidal flow. Subtidal flows are driven by conditions specific to their geographic location, namely river discharge, tidal forcing, and wind. These conditions are further modified by mixing, curvature of the estuary, Coriolis, and friction. While many practices of measuring these various forcing mechanisms exist, the current literature fails to provide a standard for measuring turbulent mixing in well- mixed estuaries. As a changing climate affects these various forcing and modifying mechanisms via sea level rise and increased precipitation, the corresponding material transport scheme is expected to change accordingly. Subtidal flow and …
Transformation Of Nonlinear Waves In The Presence Of Wind, Current, And Vegetation, Haifei Chen
Transformation Of Nonlinear Waves In The Presence Of Wind, Current, And Vegetation, Haifei Chen
Electronic Theses and Dissertations
Accurate prediction of extreme wave events is crucial for the safe maritime activities and offshore operations. Improved knowledge of wave dissipation mechanisms due to breaking and vegetation leads to accurate wave forecast, protecting life and property along the coast. The scope of the thesis is to examine the wave transformations in the presence of wind, current, and vegetation, using a two-phase flow solver based on the open-source platform OpenFOAM. The Reynolds-Averaged Navier-Stokes (RANS) equations are coupled with a Volume of Fluid (VOF) surface capturing scheme and a turbulence closure model. This RANS-VOF model is adapted to develop a numerical wind-wave-current …
Criteria And Tradeoffs For Evaluating Pumped Storage Generation, Dwight L. Glasscock, Jack C. Howe
Criteria And Tradeoffs For Evaluating Pumped Storage Generation, Dwight L. Glasscock, Jack C. Howe
Dickey-Lincoln School Lakes Project
Tonight's paper was originally presented last fall to the International Energy Engineering Congress in Chicago by Dwight Glasscock, Vice President of Hydro & Water Resources Division, Chas . T. Main, Inc. It has been amplified since then and will become a Company publication on Pumped Storage. Its central theme is that pumped storage generation in its economic aspect resembles that of a thermal generating plant; it has a capital cost and it consumes "fuel", namely off peak energy, which it converts at limited efficiency to produce electrical energy on demand. Paradoxically a pumped storage plant which is physically very similar …
Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 2: Hydrology And Hydraulic Analysis: Section 3 - Dickey Dam-Spillway Design Flood, Army. Corps Of Engineers. New England Division
Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 2: Hydrology And Hydraulic Analysis: Section 3 - Dickey Dam-Spillway Design Flood, Army. Corps Of Engineers. New England Division
Dickey-Lincoln School Lakes Project
This report, Section III, is the third of five sections comprising Design Memorandum No. 2. This section, on the development of the spillway design flood (SDF) for the Dickey project, describes the hydrologic criteria used and analysis performed in determining the SDF and the results of routing the flood through the reservoir in order to establish surcharge-length relations for the spillway at Dickey Dam. Also included is a discussion of freeboard requirements, frequency of filling data, an update of climatologic data and daily discharge records of the Saint John and Allagash Rivers.