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Numerical Experiments for Anisotropic Behavior of Granular Materials
A three dimensional discrete element computer code 'TRUBAL' is used to investigate the effect of initial anisotropy on stress-strain and volume change characteristics...

Microstructure and Stress Differences in Shearing Flows
Steady shearing flows of highly inelastic particles are simulated using rigid and slightly deformable sphere models. Large first normal stress differences in small systems are observed,...

Computer Simulations of Rapid Granular Flows Interacting with a Flat, Frictional Boundary
This paper compares the results of numerical simulations for the rapid, steady flow of identical spheres colliding with a flat frictional boundary with the recent predictions of Jenkins...

Numerical Simulation of Localization in Granular Materials
The structure of persistent shear bands in granular materials is investigated by numerically simulating an idealized assembly of two-dimensional particles. Flexible stress-controlled boundaries...

Interparticle Sliding and Rolling
Numerical experiments are done with a continuum plasticity program in order to study the initiation and evolution of shear bands. Many elements are used in order to resolve families of...

An Expert System for Estimating Soil Strength Parameters
An expert system to aid in selecting shear-strength parameters for use in stability analysis was developed for use on a PC. It provides guidance in interpreting strength measurements and...

Monte Carlo Simulations of the Dynamic Response of Pile Groups
A study is presented on the effect of variations of relevant parameters within a pile group on the vertical dynamic response of the group. These parameters include the shear wave velocity...

Data Base of Seismic Body Wave Velocities and Geotechnical Properties
A data base of seismic velocities measured in soils and standard geotechnical engineering material properties has been established at the U.S. Army Engineer Waterways Experiment Station...

Hugo 1989 - The Performance of Structures in the Wind
The performance of buildings in the Carolinas during Hurricane Hugo, 21-22 September 1989, is reviewed. Wind speeds in most locations were below the design levels specified in the local...

Alaska Coastal Management Program: Development of the Coastal Zone Boundary
The Coastal Zone Management Act of 1972 required participating states to identify areas subject to a state management program, or delineate a coastal zone boundary. Alaska's...

Hydrodynamic Behavior of Cohesive Sediments in Turbulent Flow
To meet both engineering and basic research requirements, a series of experiments on the deposition of cohesive soil were conducted in an annular rotating fiberglass channel-ring system...

Dynamic Flushing of Pocket Marinas
The expanding demand for marina space combined with just concerns for the coastal environment has developed an urgent need for methods for evaluation of the flushing characteristics of...

Reassessing the 3-Mile State/Federal Boundary
The allocation of state versus federal authority offshore is critical in determining the complexion and pace of OCS oil and gas development. Yet, recurring drilling moratoria indicate...

Fishery Management Implications of the U.S. Territorial Sea Extension
The Magnuson Fishery Conservation and Management Act of 1976 (MFCMA) declares a national standard that '[t]o the extent practicable, an individual stock of fish shall be managed...

Regional Ocean Resources Management
The fluid nature of the ocean environment and the mobility of living ocean resources place obvious limits on the ability of state and federal resource managers to effectively manage based...

Sea Level Rise and Maritime Boundaries: The Effect of Rising Sea Level on International Boundaries
This paper, jointly written by a lawyer and a coastal geomorphologist, will examine the possible responses at a legal level to the implications of global warming induced sea level rise...

Evidence for Eustatic Influence on Cenozoic Sedimentation of Coastal Washington and Oregon
Comparison of the absolute age boundaries of the West Coast biozonation with the Cenozoic global cycle chart indicates that 12 of the 15 zonal boundaries coincide with regressive sequence...

Basic Physical Models in Sediment Transport
Basic particle dynamics and cellular automata micromodels of clastic sediments are described and applications are illustrated in the areas of aeolian saltation, bedload transport, size...

Mechanics of Cohesionless Sediment Transport in Coastal Waters
Conceptual mechanics-based models for sediment transport processes in steady and unsteady turbulent boundary layer flows are derived and discussed. To the extent possible the predictions...

Turbulence Measurements and Parameterizations
Bottom boundary layer and exchange models account for high frequency turbulence via Reynold's averaging and the most advanced closure formulations required by this averaging...

 

 

 

 

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