Prediction of Time Development of Local Scour
The prediction of the time development of local scour is commonly solved by means of model tests. A brief description of the time-scale and the relation between the time and the scour...
Estimating Velocity and Scour in River Bends
A one-dimensional, steady-state, stream tube model was used to simulate hydraulic characteristics at a cross section. This enabled computation of higher velocities on the outside and lower...
The Area of Scour Hole Around Bridge Piers
The study is focused on what parameters determine the area of scour hole around bridge piers. An analytical study based on momentum principle has been used to reveal the variables involved...
Low-Waterway and Bank Erosion in a River With Alternating Bars Bed
In a river with alternating bars bed, the banks are often subjected to erosion due to the convergent flow resulted from the bed geometry, even in a straight channel. It is known empirically...
Scour Assessment at Bridges
Due to the key role that bridges play in the national transportation system, the Federal Highway Administration has developed a scour evaluation program. This program, issued in the form...
Scour Protection at the Straight Drop Spillway
Tests were conducted to determine the scour and the effect of tailwater on scour downstream of the straight drop spillway stilling basin. Preliminary results are presented on performance...
Local Scour at Bridge Abutments
Comparison of local scour depths at bridge abutments computed using different equations yields a large variation in predicted values. To consolidate the fragmented results of previous...
Analysis of Local Scouring
An understanding of local scouring is very important for the safety and integrity of hydraulic structures. The location, shape, and magnitude of the scour hole is a function of dynamic...
Groins and Vanes Developed Basing Upon a New Concept of Bank Protection
At curved bends, scour at the outer bank always accompanies deposition at the inner bank. A highly efficient river course for flood flow is considered to have a small lateral gradient...
Hydraulic Analysis of the Schoharie Creek Bridge
Ten people died on April 5, 1987 as a result of the collapse of two spans of a New York State Thruway bridge into the floodwaters of Schoharie Creek. The cause of the bridge failure was...
Long Lake Dam Model Studies
The Long Lake spillway was designed at the turn of the century as a standard ogee section with an upstream batter for a maximum head of 179 feet (55 m). It did not include any energy dissipator....
Model Studies for Potential Modification of Pardee Spillway
East Bay Municipal Utility District, a public water supply agency in the San Francisco Bay Area, is examining the spillway adequacy of its primary water supply reservoir. Flood routing...
Lessons from Schoharie Creek
The failure of the Schoharie Creek Bridge in New York State occurred in April 1987. Several investigative panels were commissioned. The failure has been generally attributed to scour,...
Toe Scour Protection in Open Channels
Scour at the toe of bank protection works is one of the major causes of failure of these structures. Weighted riprap toes are frequently used to prevent bank protection failure due to...
Analytical Studies of the Schoharie Bridge Failure
Analytical studies consisted of geomorphic, hydrologic, hydraulic, and erosion analyses including mathematical modeling with HEC-1 and WSPRO, the new FHWA water-surface profile model....
Schoharie Creek Bridge Model Study
On April 5, 1987, a major storm occurred in the Schoharie Creek watershed and the resulting flood caused the bridge to fail. The hydraulic model of the bridge was performed to simulate...
Analysis of Onsite Measurements of Scour at Piers
Existing onsite measurements of local scour at bridge piers were assembled and analyzed to obtain an equation that predicts the expected maximum depth of local scour at a bridge pier....
Scour Downstream of the Straight Drop Spillway
Tests made to determine the effect of high tailwater and long duration flows on scour downstream of the straight drop spillway stilling basin are presented in this paper. Results are presented...
Local Scour Downstream of a Tunnel Outlet Structure
The local scour downstream of two different types of outlet structures is studied in laboratory experiments with an alluvial sediment. The outlet structure terminates a hydraulic model...
Flood Event Prediction with Movable Bed Model
This study shows the applicability of using a numerical sedimentation model to analyze various problems related to flood-control design in an alluvial river. Problems concerned with maintaining...
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