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RISA Comparison of Spatially Averaged Eulerian and Semi-Lagrangian Treatments of Mountains
Publisher: American Meteorological Society
Abstract: It has been demonstrated previously by both analysis and numerical integration that there is a serious problem incorporating orographic forcing into semi-implicit semi-Lagrangian models, since spurious resonance can develop ...
Evaluation of Combination Rules for Orthogonal Seismic Demands in Nonlinear Time History Analysis of Bridges
Publisher: American Society of Civil Engineers
Abstract: One of the parameters that directly affects the seismic demand on a bridge is the excitation angle of the ground motion. Since analyzing a bridge with all possible excitation angles is impractical, combination rules have ...
Elimination of the Helmholtz Equation Associated with the Semi-Implicit Scheme in a Grid Point Model of the Shallow Water Equations
Publisher: American Meteorological Society
Abstract: A modification is introduced in a semi-implicit version of a grid point model of the shallow water equations. The new model is simpler, runs one-third, and after 5 days of integration, the forecasts differ by less than 1 m.
Global Modes of Sea Surface Temperature Variability in Relation to Regional Climate Indices
Publisher: American Meteorological Society
Abstract: century-long EOF analysis of global sea surface temperature (SST) was carried out and the first six modes, independent by construction, were found to be associated with well-known regional climate phenomena: the El ...
Choking Phenomena in a Vortex Flow Passing a Laval Tube: An Analytical Treatment
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The behavior of a vortex flow through a Laval nozzle was studied in connection with the purification of natural gas. By creating a vortex and passing it through a Laval nozzle, the gas will ...
Solar Thermal Splitting of Zinc Oxide: A Review of Some of the Rate Controlling Factors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: It is possible to use concentrated solar energy for producing zinc by direct high temperature dissociation of ZnO. The purpose of the present paper is to show that the overall efficiency of ...
Probabilistic Demand Models and Fragility Estimates for Bridges Elevated with Steel Pedestals
Publisher: American Society of Civil Engineers
Abstract: Probabilistic seismic demand models are developed for bridges elevated with steel pedestals by adding correction and error terms to commonly used models. Separate probabilistic demand models are developed for the force ...
The Impact of Diurnal Cycle on a Low-Froude Number Flow Observed during the PYREX Experiment
Publisher: American Meteorological Society
Abstract: The intensive observing period (IOP) 4 of the Pyrenees Experiment (PYREX) has been simulated with a hydrostatic three-dimensional model. The PYREX IOP 4 was devoted to the observation of the orographically generated flow ...
Four-Dimensional Variational Data Assimilation with Digital Filter Initialization
Publisher: American Meteorological Society
Abstract: A four-dimensional variational (4DVAR) data assimilation problem may be constrained so that the solution closely fits the observations but is balanced. In this way, the processes of data analysis and initialization are ...
Linearization of a Simplified Planetary Boundary Layer Parameterization
Publisher: American Meteorological Society
Abstract: This study examines the linearization properties of a simplified planetary boundary layer parameterization based on the vertical diffusion equations, in which the exchange coefficients are a function of the local Richardson ...