Shape Effect on Bed-Load Transport in Pipes
The nature of part-full flows in pipe sewers produces different channel shapes resulting in non-uniform shear stress distribution on the wetted perimeter. New experimental data were utilized...
Indian River Inlet: Is There a Solution?
Man-made changes at Indian River inlet, Delaware, have occurred over the past 6 decades. During this period the tidal prism of the Indian River-Rehoboth Bays system has increased along...
A Mathematical Model of Flow in Mildly Sinuous, Deep Channels
A mathematical study of flow in deep, weakly-meandering channels has been carried out and formulations for the tangential and radial velocities, valid in conditions have been developed....
Two-Dimensional Hydrodynamic Modeling with a Computer Graphics System
For more than a decade various divisions and district offices of the U.S. Army Corps of Engineers have been active in the development of graphic information system databases and computer...
Numerical Modeling of Unsteady Compound Channel Flow
The unsteady open channel flow equations describing conservation of mass and momentum (St. Venant equations) are integrated numerically to determine the depth of flow and the rate of discharge...
Use of Floodplain PCB Concentrations to Calibrate a River Hydraulics Model
A river floodplain was found to contain measurable quantities of polychlorinated biphenyls (PCBs), presumably deposited during historic flood events. A hydraulic model (HEC-2) was used...
Assessment and Prediction of Debris-flow Hazards
Study of debris-flow geomorphology and initiation mechanism has led to better understanding of debris-flow processes. This paper reviews how this understanding is used in current techniques...
Research Needs for Debris Flow Disaster Prevention
A 'soft' disaster reduction strategy is proposed based on identification of hazard location, extent and maximum intensity; monitoring of antecedent catchment moisture, sediment and vegetation...
Debris Flows in Grand Canyon National Park, Arizona: Magnitude, Frequency and Effects on the Colorado River
Debris flows are recurrent sediment-transport processes in 525 tributaries of the Colorado River in Grand Canyon. Arizona. Initiated by slope failures in bedrock and (or) colluvium during...
Debris Flows and Mass Wasting in Volcanic Torrents
Observation of debris flow and topographic survey for mass wasting in the volcanic torrents clarified that (1) mass wasting processes such as rock fall from the side-wall and toppling...
Interpreting Debris-Flow Hazard from Study of Fan Morphology
The deposits, stratigraphy, and surface morphology of debris-flow fans are a record of past debris-flow activity, and as such can provide useful information about debris-flow hazards....
Fish Screen Developments, Columbia River Dams
This paper describes developments to date for a fish diversion and bypass system being tested for two Columbia River dams. Because of the concern for the negative impacts of screen systems...
Hydraulic Aspects of a Low-Velocity, Inclined Fish Screen
The Potter Valley Hydroelectric Project diverts up to 310 cfs from Van Arsdale Reservoir on the Eel River in north-central California and delivers it to Potter Valley for power production...
Flow Resistance Properties of Flexible Linings
Flow resistance for flexible channel linings is a function of the relative roughness of the lining in accordance with boundary-layer principles. As with vegetation, flexible linings have...
Determination of Hydraulic Roughness for Concrete-Lined, Supercritical Channels
A channel verification program has been initiated by the US Army Engineer District, Los Angeles to determine the hydraulic roughness of flow in a concrete channel. Specifically, this study...
A Method of Managing Floating Debris
The device described offers a promising approach to a new method of managing floating debris. It modifies the surface flow of water from a submerged location. The modified flow reduces...
Variations Encountered in Design Analysis of Local Scour at Drop Structures
Proper design of drop structures can prevent failure due to scour at upstream structures, like bridges. An important aspect of drop-structure design is the prediction of the local scour...
Mechanics of Debris Flows
The paper deals with the mechanics aspects of the modelling of debris flows and will focus on steady, fully developed flows. After a brief review of the types of constitutive equations...
Kenetic-theory Approach to the Nevado Del Ruiz 1985 Debris Flow
The Nevado del Ruiz 1985 debris flow was the worst disaster of its kind in this century, killing 22,000 people. By making an idealization of the debris flow material and the flow regime,...
Continuum-Mechanics-Based Rheological Formulation for Debris Flow
This paper aims to assess the validity of the generalized viscoplastic fluid (GVF) model in the light of both the classical relative-viscosity versus concentration relation and the dimensionless...
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