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

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

Mixing Formula for Dielectric Constant and its Application Measured and predicted √K a,m /√K a,w versus sediment thickness Estimated thickness of sand layer (cm) 30 25 20 15 10 5 0 Fine sand in tap water Fine sand in 250ppm solution Linear Fit of Estimated thickness of sand layer Equation Weight Residual Sum of Squares Adj. R-Square Estimated thickness of sand layer y = a + b*x No Weighting 2.3419 0.99859 0 5 10 15 20 25 30 35 Measured thickness of sand layer (cm) Value Standard Error Intercept 0 -- Slope 0.98828 0.01315 Thickness of sand layer estimated by the dielectric constant mixing formula 40
Mixing Formula for Electrical Conductivity and its Application EC b, bs L1 + EC L , m w w L2 L EC Akie's Law : Formation ECb ⇒ EC = 1− = f L1 ( 1− n ) L b, m Factor 1 F ECb = EC = n – Approximate linear relationship between ECb,m and sediment thickness at a given electrical conductivity of water – Predict sediment thickness from measured electrical conductivity ECb,m , bs w f b φ=2a L1 L2 L R1 R2 R
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 and 16: Literature review: scour monitoring
Page 17 and 18: 2.1 Motivation for Scour Instrument
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: 3.2 Algorithms for TDR Signal Inter
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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