Removal of Tidal Fluctuations from Pumping Test Data
A simple technique for removing tidal fluctuations from drawdown data was examined. This technique relied simply upon transforming measured surface water level data to fit the pretest...
Quality Control and Quality Assurance Plan for Bridge Channel-Stability Assessments in Massachusetts
A quality control and quality assurance plan has been implemented as part of the Massachusetts bridge scour and channel-stability assessment program. This program is being conducted by...
Screening of Bridges in New Jersey for Scour
New Jersey Department of Transportation has embarked on a program to evaluate all existing bridges over waterways to assess their vulnerability to failure by scour. The Stage I (Screening...
Quality Control in Evaluating Scour at Bridges
Quality control procedures currently in use for conducting statewide bridge scour screening and evaluation studies are described. The procedures address bridge scour screening and calculation...
New Jersey Bridge Scour Evaluation Program
The New Jersey Department of Transportation has undertaken an ambitious scour evaluation program for the existing waterway bridges in the state. The methodology developed and utilized...
In-Depth Scour Evaluations for Bridges in Pennsylvania
The scour evaluations described herein have been prepared for the Pennsylvania Turnpike bridge crossing the Unami Creek, the first bridge studied in a series of nineteen major Turnpike...
Comparison of Two Methods of Screening Bridges for Scour
Scour evaluations were performed for large numbers of bridges in two separate studies in New York and New Jersey. The two studies used different screening methods for identifying high-priority...
Risk Analysis of River Bridge Failure
The proposed procedure to determine the risk of river bridge failure is based on observations and analysis of river bridge failure data of more than 300 U.S. bridges, 180 South African...
Implementation of the NBIS Scour Evaluation Program?District 2, Florida
The Federal Highway Administration is now requiring a comprehensive evaluation of bridge scour as part of the National Bridge Inspection Standards (NBIS). District 2, Florida Department...
The Fallacy of Local Abutment Scour Equations
Existing laboratory model studies for quantifying local abutment scour deviate significantly from conditions typically found in the field. This has resulted in predictive local abutment...
Bed Sediments Size Changes, Atchafalaya River
During low flows of 1989 and 1991, we collected bed sediment samples from the thalwegs of the Mississippi River from Cairo, Illinois, to Head of Passes and along the Atchafalaya River...
Bank Stability Analyses Versus Field Observations
The concept and process of stream bank stabilization design through the development and use of limiting stability curves for the comparison of existing bank height/angle combinations to...
Preliminary Studies of Pressure Flow Scour
Bridges that become inundated during floods have slightly pressurized flow that impacts bridge piers and creates an aggravated scour condition. Results of two preliminary laboratory studies...
Economics of Floods, Scour, and Bridge Failures
Hydraulic events occur more often and account for more losses than any other natural disaster. The damage inflicted on our nation's highway facilities during these events not only results...
Scour Around Bridge Piers in Oklahoma Streams in 1986
Historically, Oklahoma has received many severe rainfall and flooding events due to hurricanes hitting the coast of Florida and moving to the Gulf Coast area. One such event occurred during...
Video Analysis of Gravel Saltation
Experimental results concerning saltation characteristics of gravel particles in a movable bed channel are analyzed by using video imaging techniques. Ensemble averaged values of saltation...
An Experimental Study of Bivalve Siphonal Jets in a Turbulent Boundary Layer Crossflow
We conducted experiments in a laboratory flume to study the interaction of bivalve siphonal jets with the turbulent boundary layer which forms in the benthic region of shallow estuaries....
Drag Characteristics of Coarse Sediment in Clay Suspensions
Drag characteristics of spherical particles in clay suspensions, such as coarse sediment in hyperconcentrated flows, has been analyzed by using a limited data available in the literature....
McCormick Bridge Scour Evaluation?A Case Study of a Tidal Bridge
Although the Federal Highway Authority has implemented procedures for bridge scour analysis in their HEC-18 publication, they do not indicate a procedure for scour depth determination...
A Tidal Inlet Bridge Scour Assessment Model
Undermining of bridge structures constructed in tidal inlets is a common problem. Scour mechanisms in tidal inlets are often complex combinations of local contraction and regional tidal...
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