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RISEnsemble Kalman Filter Assimilation of Doppler Radar Data with a Compressible Nonhydrostatic Model: OSS Experiments
Publisher: American Meteorological Society
Abstract: A Doppler radar data assimilation system is developed based on an ensemble Kalman filter (EnKF) method and tested with simulated radar data from a supercell storm. As a first implementation, it is assumed that the forward ...
Simultaneous Estimation of Microphysical Parameters and Atmospheric State with Simulated Radar Data and Ensemble Square Root Kalman Filter. Part I: Sensitivity Analysis and Parameter Identifiability
Publisher: American Meteorological Society
Abstract: The possibility of estimating fundamental parameters common in single-moment ice microphysics schemes using radar observations is investigated for a model-simulated supercell storm by examining parameter sensitivity and ...
Simultaneous Estimation of Microphysical Parameters and Atmospheric State with Simulated Radar Data and Ensemble Square Root Kalman Filter. Part II: Parameter Estimation Experiments
Publisher: American Meteorological Society
Abstract: The ensemble Kalman filter method is applied to correct errors in five fundamental microphysical parameters that are closely involved in the definition of drop/particle size distributions of microphysical species in a ...
Development of a Suspended Backpack for Harvesting Biomechanical Energy
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this study, a harvesting device embedded into a suspended backpack was developed to harness part of a human's biomechanical energy and reduce dynamic force of the backpack on the carrier. The harvester utilized a spring ...
DEM Analysis of Mechanical Behavior of Unsaturated Silt under Strain-Controlled Constant Stress Ratio Compression Tests
Publisher: ASCE
Abstract: The three-dimensional discrete element method (DEM) is employed to investigate the macro- and microscopic mechanical behaviors of unsaturated silt subjected to one-dimensional (K0) and constant stress ratio loadings. A DEM ...
Efficient Iterative Analytical Model for Underground Seepage around Multiple Tunnels in Semi-Infinite Saturated Media
Publisher: ASCE
Abstract: The construction and long-term use of underwater tunnels suffer from hazards associated with the pore pressure and water inflow. Analytical approaches quickly can predict the seepage field, through which the water inflow ...
DEM-Aided Discovery of the Relationship between Energy Dissipation and Shear Band Formation Considering the Effects of Particle Rolling Resistance
Publisher: American Society of Civil Engineers
Abstract: The importance of particle rolling resistance to the mechanical behavior of granular materials is well recognized and has been a topic subject to intensive discrete element method (DEM) investigation over the last two ...
DEM Modeling Mechanical Behavior of Unsaturated Structural Loess under Constant Stress Increment Ratio Compression Tests
Publisher: American Society of Civil Engineers
Abstract: This paper presents a numerical investigation into the macromechanical and micromechanical behavior of unsaturated structural loess under constant stress increment ratio compression using the distinct-element method (DEM). ...
Ensemble Kalman Filter Analyses of the 29–30 May 2004 Oklahoma Tornadic Thunderstorm Using One- and Two-Moment Bulk Microphysics Schemes, with Verification against Polarimetric Radar Data
Publisher: American Meteorological Society
Abstract: he performance of ensemble Kalman filter (EnKF) analysis is investigated for the tornadic supercell on 29?30 May 2004 in Oklahoma using a dual-moment (DM) bulk microphysics scheme in the Advanced Regional Prediction System ...
Properties of TJ-1 Lunar Soil Simulant
Publisher: American Society of Civil Engineers
Abstract: Tongji-1 lunar soil simulant (TJ-1 for short) was recently invented by Tongji University, China. It could be used to construct testing ground in the preparatory impact tests of lunar landers under the extremely adverse ...