Optimization Modeling for Sedimentation in Alluvial Rivers Considering Uncertainties
A nonlinear optimization model is formulated for determining optimal reservoir releases to minimize channel bed aggradation and degradation in downstream rivers. The model is based upon...
New Austrian Dam Side-Channel Spillway
The Loma Prieta earthquake of 17 October 1989 damaged the chute spillway at the Austrian Dam near San Jose, California. The replacement spillway, with a higher design discharge of 11,500...
Engineering Geomorphology
Engineering geomorphology is the application of geologic and geomorphic principles to the solution of river engineering problems. Development of a process-based understanding of a problem...
Application of Four Point Model to the Sacramento-San Joaquin Delta
Four Point (Delong et al. 1993) is a finite-difference, one-dimensional, unsteady, open channel, hydrodynamic model. The Modeling Support Branch of the Division of Planning, California...
A Hydrodynamic Model for a Tidal Wetland
A hydrodynamic model is developed for San Elijo Lagoon, a wetland with tidally influenced area of 1.5 km2 (380 acres). A quasi two-dimensional (2-D)...
Tidal Propagation in a Distorted Model
A largely analytical study of tidal flow in the Sacramento/San Joaquin delta system provides the basis of an investigation of physical model distortion on tidal circulation in a complicated...
Weaver Bottoms Backwater Rehabilitation
Navigation channel dredge material was used to construct closure structures and islands in lower pool 5 on the Upper Mississippi River in 1986. Primary objectives included aquatic habitat...
Bridge Abutment Scour in Compound Channels
Experiments are reported which quantify the effect of channel geometry on local scour at abutments for bridges crossing compound river channels. The channel geometry effects are represented...
Computer Aided Design and Cost Estimation of Gabion Lined Channels
Rivers are a dynamic part of the hydrologic cycle. Changes in discharge, flow depth, water velocity, and meander patterns contribute to this dynamic nature. As a result, portions of a...
Particle Tracking Model for the Sacramento-San Joaquin Delta
A mathematical model has been developed to simulate the movement and fate of individual particles in a water column in an estuarine environment. The developed model not only keeps track...
Effect of Grain Size on Sediment Transport Calculations
The U.S. Army Corps of Engineers is currently developing a `Hydraulic Design Package for Flood Control Channels' (SAM). SAM is capable of computing sediment rating curves and stable channel...
Nonuniform Transient Sediment Transport Modeling
A numerical model based on Lai's (1991) multimode scheme for fully coupled simulation of water and sediment movement in mobile-bed alluvial channels with nonuniform bed materials has been...
n Values for Shallow Flow in Rough Channels
Manning's friction factor n has been developed from flume data for very shallow open channel flow in a high-gradient channel with large bed material. n values are presented as a function...
Local Scour at Skewed Bridge Piers
Presented herein are experimental data showing the influence of pier skewness, also referred to as angle of attack, on depth of local scour at rectangular and oblong bridge piers. The...
Supply of Large Woody Debris in a Stream Channel
The amount of large woody debris that potentially could be transported to bridge sites was assessed in the basin of the West Harpeth River in Tennessee in the fall of 1992. The assessment...
A 2-D Numerical Model for High Velocity Channels
The hydraulic performance of a high velocity channel depends on maintaining a supercritical flow regime over specified portions of its length. Predicting the potential location of shocks...
Low-Flow Habitat in Flood Control Channels
A critical phase in the life cycle of many riverine species in flood control channels is during low-flow periods when the quantity and quality of available habitat diminishes. However,...
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....
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...
Storm Drainage Channel Rehabilitation
30 km (19 miles) of existing concrete lines storm drainage channels were studied due to repeated failures. Alternate failures causes were hypothesized and evaluated. Physical testing was...
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