A Critical Evaluation of Bridge Scour for Michigan Specific

Conditions

A presentation to MDOT TAG by

Lawrence Tech University

&

Wayne State University

July 30, 2008

Agenda

Project Overview Site Selection Process Equipment Data Acquisition Modeling Questions

Project Goals The objective of this research is to improve the MDOT

bridge scour prediction capability. This will be accomplished by calibrating and/or modifying level 2 (HEC-18) scour prediction equations for Michigan specific conditions.

The research plan consists of: Literature Review Evaluate MDOT’s Current Scour Evaluation Procedures Review Scour Evaluation Methods Utilized by Other States Calibrate Level 2 (HEC-18) Scour Prediction Equations for

Michigan Specific Conditions

Project Goals

Task Topics

Literature Review Review and summarize existing USGS, FHWA, and ASCE reports (LTU &

WSU) Perform detailed literature review of electronic databases (LTU & WSU) Contact state DOTs to identify non peer reviewed publications (LTU)

Evaluate MDOT’s Current Scour Evaluation Procedures

Review, summarize, and critique existing MDOT methodologies for scour evaluation (LTU & WSU)

Review and evaluate pre-existing engineering data for bridge scour evaluation (LTU & WSU)

Review and evaluate existing databases and database management techniques (LTU & WSU)

Project meetings with MDOT engineers and managers (LTU & WSU)

Review Scour Evaluation Methods Utilized by Other States

Review, summarize, and critique other state DOT methodologies for scour evaluation (LTU)

Contact appropriate departments within each DOT for bridge scour information (LTU)

Determine bridge scour information available through public accessible websites (LTU)

Project GoalsTask Topics

Calibrate Level 2 (HEC-18) Scour Prediction Equations for Michigan Specific Conditions

Establish a field data collection personnel safety plan to insure safety of project participants when collecting field data. MDOT safety protocols will be used as a guide (LTU & WSU)

Visit scour critical bridges throughout the lower peninsula of Michigan as identified through meetings with MDOT (LTU & WSU)

Select 12 scour critical bridges across the lower peninsula for episodic monitoring (LTU & WSU)

Select 2 scour critical bridges for continuous monitoring of scour (LTU & WSU) Collect field data and soil samples for all 14 selected scour critical bridges (LTU

& WSU) Perform Level 2 Analysis for 14 selected bridges if necessary. Level 2 Analysis

will not be preformed as part of this project if it was recently completed by MDOT (WSU)

Perform jet device testing at all 14 selected scour critical bridges to determine in-situ soil erodibility (LTU)

Conduct geotechnical laboratory investigation of soil sample to evaluate geotechnical properties of all 14 selected sites (LTU)

Conduct HEC-RAS computer simulations for 14 selected sites as necessary (WSU)

Conduct a parametric evaluation of HEC-18 Scour Prediction Equations for Michigan specific conditions based on existing and project collected scour data (LTU)

Calibrate the Level 2 (HEC-18) Scour Prediction Equations for Michigan specific conditions based on field monitoring of scour, jet device correlations, and parametric evaluation (LTU & WSU)

Generate final report (LTU & WSU) Copy, bind, and submit final report (LTU)

Timeline

Criteria for Selection

Bridges on the Scour Critical List - State and County Trunk lines

Location spread through multiple watersheds access and ease of monitoring proximity to flow data

Soil Conditions - cohesive Presence of scour counter measures

ScourCritical List

Bridges Visited

Selected Sites

Selected Sites Bay Region = 3 Locations

Bad River @ M-52 Flint River @ M-15 Pine River @ Lumberjack Road

Grand Region = 2 Locations Rogue River @ US-131 Rogue River @ Edgerton Road

Selected Sites Southwest Region = 4 Locations

Thornapple River @ M-43 Thornapple River @ Hastings Kalamazoo River @ I-194 Kalamazoo River @ M-89

University Region = 4 Locations Battle Creek River @ M-78 Grand River @ M-99 Black Creek @ Treat Highway River Raisin near Adrian

Bay Region

Flint River M-15

Bay Region

Bad River M-52

Bay Region

Pine River LumberJack Road

Grand Region

Rogue River US-131

Grand Region

Rogue River Edgerton road

Southwest Region

Kalamazoo River M-89

Southwest Region

Kalamazoo River I-194

Southwest Region

Thornapple River M-43

Southwest Region

Thornapple River McKeown Road

University Region

Grand River M-99

University Region

Battle Creek River M-78

University Region

Black Creek Treat Highway

University Region

River Raisin Adrian USGS Site

Instrumentation

Continuous Monitoring Episodic Monitoring Scour Chains Jet Scour

Continuous Monitoring

Episodic Monitoring

Scour Chains

Jet Scour

Analysis

Databases National Bridge Scour Database Regional Bridge Scour Information

Froelich Paper Re-parameterization using the NBSDB

HEC-RAS Exploring data requirements

Holtschlag & Miller

Questions?

Questions For MDOT

Feedback on Bridges Selected Database Information

Level2 Data HEC-RAS runs for sites selected

Michigan Specific Conditions (Cohesive vs. Non-Cohesive)