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Scour Evaluation Studies: Scour in Cohesive Soils and Ex Situ Scour Testing Device

Project Information

Project ID: 
FHWA-PROJ-07-0027
Project Status: 
Completed
Start Date: 
Monday, October 1, 2007
End Date: 
Wednesday, July 30, 2014
FHWA Program: 
Infrastructure
FHWA Subprogram: 
Hydraulics
FHWA Topics: 
Roads and Bridges--Hydraulics
TRT Terms: 
Scour; Infrastructure; Soils; Research; Bridges; Erosion; Hydraulics
FHWA Discipline: 
Hydraulics
TRB Subject Area: 
Hydraulics and Hydrology

Contact Information

First Name: 
Kornel
Last Name: 
Kerenyi
Telephone: 
(202) 493-3142
Email Address: 
Team: 
Bridge Engineering Team
Office:
Office of Infrastructure Research and Development
Office Code: 
HRDI-40

Project Details

Project Description: 

Scour in cohesive soils is a complicated phenomenon that is far from understood. Conventional approaches to cohesive soil scour prediction are applying laboratory experimental results of cohesionless soils to cohesive soils and are usually overly conservative. Previous research focused on the critical shear stress while the effects of vertical pressure fluctuations on scour initiation were not considered. The fact is that although shear stress moves sediments into motion in sliding or rolling modes, the saltation mode of bedload results from the vertical pressure fluctuations or lift. The objective of this study is to understand the soil and fluid characteristics in the bed boundary flow structure, and establish an incipient motion criterion for cohesive soil scour.

Goals

The primary objective of this study is to develop design tools for scour in cohesive soils that will be implemented in Hydraulic Engineering Circular No. 18, "Evaluating Scour at Bridges."

Deliverables

Deliverable Name: 
Design guidelines for scour in cohesive soils
Deliverable Type: 
Research report or guidelines
Deliverable Description: 
The primary objective of this study is to develop design tools for scour in cohesive soils that will be implemented in Hydraulic Engineering Circular No. 18, "Evaluating Scour at Bridges."