Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 5 of 5
Full-Text Articles in Engineering
Adaptation Of Classical Tidal Harmonic Analysis To Nonstationary Tides, With Application To River Tides, Pascal Matte, David A. Jay, Edward D. Zaron
Adaptation Of Classical Tidal Harmonic Analysis To Nonstationary Tides, With Application To River Tides, Pascal Matte, David A. Jay, Edward D. Zaron
Civil and Environmental Engineering Faculty Publications and Presentations
One of the most challenging areas in tidal analysis is the study of nonstationary signals with a tidal component, as they confront both current analysis methods and dynamical understanding. A new analysis tool has been developed, NS_TIDE, adapted to the study of nonstationary signals, in this case, river tides. It builds the nonstationary forcing directly into the tidal basis functions. It is implemented by modification of T_TIDE; however, certain concepts, particularly the meaning of a constituent and the Rayleigh criterion, are redefined to account for the smearing effects on the tidal spectral lines by nontidal energy. An error estimation procedure …
Tsunami Hydrodynamics In The Columbia River, Harry Yeh, Elena Tolkova, David A. Jay, Stefan A. Talke, Hermann Fritz
Tsunami Hydrodynamics In The Columbia River, Harry Yeh, Elena Tolkova, David A. Jay, Stefan A. Talke, Hermann Fritz
Civil and Environmental Engineering Faculty Publications and Presentations
On 11 March 2011, the Tohoku Tsunami overtopped a weir and penetrated 49 km up the Kitakami River, the fourth largest river in Japan. Similarly, the 2010 Chile tsunami propagated at least 15 km up the Maule River. In the Pacific Northwest of the United States, large tsunamis have occurred along the Cascadia subduction zone, most recently the 'orphan tsunami' of 1700 (Atwater et al.). The expected future occurrence of a Cascadia tsunami and its penetration into the Lower Columbia River became the subject of “the Workshop on Tsunami Hydrodynamics in a Large River” held in Corvallis, Oregon, 2011. We …
Interfacial Mixing In A Highly Stratified Estuary: 2. A "Method Of Constrained Differences" Approach For The Determination Of The Momentum And Mass Balances And The Energy Of Mixing, David J. Kay, David A. Jay
Interfacial Mixing In A Highly Stratified Estuary: 2. A "Method Of Constrained Differences" Approach For The Determination Of The Momentum And Mass Balances And The Energy Of Mixing, David J. Kay, David A. Jay
Civil and Environmental Engineering Faculty Publications and Presentations
This article is Part 2 of a set of papers addressing mixing in a highly stratified estuary. In Part 2, turbulence and mean flow measurements are together used to understand the role of mixing in the overall dynamics of the system. Estimates of the partition of energy dissipation between bed-generated and internal mixing suggest that internal mixing accounts for about two thirds of the total turbulent kinetic energy (TKE) produced in the salt-wedge reach of the Columbia River estuary during the neap-tide, moderate river-flow observation period. This suggests that internal mixing plays a larger role in the energetics of such …
Particle Trapping In Stratified Estuaries - Definition Of A Parameter Space, David A. Jay, Philip M. Orton, Thomas A. Chisholm, Douglas J. Wilson, Annika M. Fain, John Mcginity
Particle Trapping In Stratified Estuaries - Definition Of A Parameter Space, David A. Jay, Philip M. Orton, Thomas A. Chisholm, Douglas J. Wilson, Annika M. Fain, John Mcginity
Civil and Environmental Engineering Faculty Publications and Presentations
Estuarine turbidity maxima (ETM) retain suspended particulate matter (SPM) through advection, settling, aggregation and non-linearities in bed processes. This contribution defines for the first time a parameter space descriptive of ETM water-column particle trapping processes through a scaling analysis of the local and integral SPM balances. In the absence of long-term deposition, there are five primary parameters for the large particles or aggregates that are typically trapped. Rouse number P, the ratio of settling velocity WS of the SPM relative to the shear velocity U*, describes the material trapped in the ETM in terms of the local vertical balance between …
The Columbia River Plume Study: Subtidal Variability In The Velocity And Salinity Fields, B. M. Hickey, Leonard J. Pietrafesa, David A. Jay, William C. Boicourt
The Columbia River Plume Study: Subtidal Variability In The Velocity And Salinity Fields, B. M. Hickey, Leonard J. Pietrafesa, David A. Jay, William C. Boicourt
Civil and Environmental Engineering Faculty Publications and Presentations
A comprehensive study of the strongly wind driven midlatitude buoyant plume from the Columbia River, located on the U.S. west coast, demonstrates that the plume has two basic structures during the fall/winter season, namely, a thin (~5~15 m), strongly stratified plume tending west to northwestward during periods of southward or light northward wind stress and a thicker (~10~40 m), weakly stratified plume tending northward and hugging the coast during periods of stronger northward stress. The plume and its velocity field respond nearly instantaneously to changes in wind speed or direction, and the wind fluctuations have timescales of 2-10 days. Frictional …