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Full-Text Articles in Engineering
Data Assimilation In Models With Convective Adjustment, Robert N. Miller, Edward D. Zaron, Andrew F. Bennett
Data Assimilation In Models With Convective Adjustment, Robert N. Miller, Edward D. Zaron, Andrew F. Bennett
Civil and Environmental Engineering Faculty Publications and Presentations
Practical hydrostatic ocean models are often restricted to statically stable configurations by the use of a convective adjustment. A common way to do this is to assign an infinite boat conductivity to the water at a given level if the water column should become statically unstable. This is implemented in the form of a switch. When a statically unstable configuration is detected, it is immediately replaced with a statically stable one in which heat is conserved. In this approach, the model is no longer governed by a smooth set of equations, and usual techniques of variational data assimilation must be …
Particle Trapping In Estuarine Tidal Flows, David A. Jay, Jeffery D. Musiak
Particle Trapping In Estuarine Tidal Flows, David A. Jay, Jeffery D. Musiak
Civil and Environmental Engineering Faculty Publications and Presentations
Particle trapping in estuarine turbidity maxima (ETM) is caused primarily by convergent mean and/or tidal fluxes of sediment. The result is an approximately bell-shaped along-channel distribution of vertically integrated, tidal cycle mean suspended sediment concentration. Observations from the Columbia River estuary suggest that (1) strong two-layer or internal along-channel residual and overtide flows are generated by time-varying stratification and (2) correlations between the near-bed velocity and the suspended sediment fields at these frequencies are important in landward transport of sediment. A new spatially and temporally integrated form of the sediment conservation equation has been derived to analyze this trapping process. …