Assessment of the Automation Algorithm for TDR Bridge - Ohio ...

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$Page 1 of 8 Traffic Survey Report 12/29/2006 file://X:\TC\Traffic ...$

2.1 Motivation for Scour Instrumentation • Hunt (2005) safety for the traveling public a reduced number of underwater and/or regular inspections early identification of problems prior to a diving inspection insight into site-specific scour processes Hawaii DOT, validation of HEC-18 equations by sonar devices Good instrumentation is essential for making proper decision, Georgia 1994 flood, 1000 bridge closed 16
2.1 Motivation for Scour Instrumentation (cont.) • Challenges for scour monitoring instrumentations • Criteria for the instrumentation Mandatory Criteria •Capability for installation on or near a bridge pier or abutment •Ability to measure maximum scour depth within an accuracy of 0.3 m (1 ft) •Ability to obtain scour depth readings from above the water or from a remote site •Operable during storm and flood conditions Site conditions that cause interference or damage to the fixed scour monitoring systems (Hunt 2005) Desirable Criteria •Capability to be installed on most existing bridges or during construction of new bridges •Capability to operate in a range of flow conditions •Capability to withstand ice and debris •Vandal resistant •Operable and maintainable by highway maintenance personnel 17
Page 1 and 2: ODOT Project Review Session Present
Page 3 and 4: Introduction 1.1 Motivation for Bri
Page 5 and 6: Classification • General Scour
Page 7 and 8: Local Scour • Pier scour and abut
Page 9 and 10: Physical Modeling Parameters relate
Page 11 and 12: Numerical Simulation • 1D simulat
Page 13 and 14: Field observation • A co-operativ
Page 15: Literature review: scour monitoring
Page 19 and 20: • Lagasse and Price 1997 NCHRP Pr
Page 21 and 22: • Mueller and Landers 1999 PVC-po
Page 23 and 24: National practice of scour monitori
Page 25 and 26: Sonar (cont.) A sonar system for br
Page 27 and 28: Sonar (cont.) • Data Acquisition
Page 29 and 30: Time Domain Reflectometry Dowding a
Page 31 and 32: Reflection at Interface Reflection
Page 33 and 34: Outline • Introduction • Litera
Page 35 and 36: Experiment Setup and Procedure •
Page 37 and 38: Voltage(V) Test results 0.4 0.0 -0.
Page 39 and 40: 3.2 Algorithms for TDR Signal Inter
Page 41 and 42: Mixing Formula for Electrical Condu
Page 43 and 44: sqrt(Ka)/sqrt(kw) Empirical Equatio
Page 45 and 46: River condition assessment • Elec
Page 47 and 48: Results by Using Design Equation
Page 49 and 50: Scour Estimation Based on Detecting
Page 51 and 52: Sample results 0.01 0 -0.01 -0.02 F
Page 53 and 54: Monitoring of Simulated Scour in Va
Page 55 and 56: Normalized dielectric constant 1.0
Page 57 and 58: Normalized dielectric constant 1.0
Page 59 and 60: TDR measurements of scour for diffe
Page 61 and 62: Scour Monitoring in Water of High E
Page 63 and 64: Dielectric constant by insulated pr
Page 65 and 66: Effect of air bubbles on dielectric
Page 67 and 68:
Scour monitoring in water with vary
Page 69 and 70:
A Comparison of TDR and Ultrasound
Page 71 and 72:
Voltage(V) Results 0.5 0.0 -0.5 -1.
Page 73 and 74:
ECb,w(ms/m) Electric conductivity o
Page 75 and 76:
Outline • Introduction • Litera
Page 77 and 78:
5.2 Use of FEMLAB for TDR Probe Des
Page 79 and 80:
Electric field, Case I 79
Page 81 and 82:
• Effective measured dielectric c
Page 83 and 84:
Sampling area ∫∫ Ω ∑ 100 ×
Page 85 and 86:
5.3 Coated TDR CS605 Moisture Probe
Page 87 and 88:
Lab Evaluation of Strip Scour Senso
Page 89 and 90:
FEMLAB Analysis of the Performance
Page 91 and 92:
Electric potential Sensor in water
Page 93 and 94:
Sampling area, saturate sand Field
Page 95 and 96:
Scour measurement TDR measured scou
Page 97 and 98:
Laboratory Observations and Algorit
Page 99 and 100:
Evaluation of TDR under Various Con
Page 101 and 102:
Future work •Continue to develop
Page 103 and 104:
Acknowledgement • Ohio Department
Page 106:
Connection to another scour monitor
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Assessment of the Automation Algorithm for TDR Bridge - Ohio ...

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