EVALUATION OF EROSION FOR COASTAL HIGHWAYS LEVEES LANE

EVALUATION OF EROSION FOR COASTAL HIGHWAYS & LEVEES LANE EVERETT BLOCKER DR. NING ZHANG & DR. ZHUANG LI, FACULTY MENTORS Mc. Neese State University Department of Engineering

OUTLINE • Purpose • Numerical Simulation • Experimental Study • Comparison of Numerical Simulation Against Experimental Study • Analysis Conclusion • Future Research

PURPOSE • Coastal Highways Protect Coastal Shorelines • Highways Serve as Barrier to Flood Damage • Loss of Emergency Routes from Coastal Areas • Significant Costs Related to the Rebuilding of Failed Highways • A Better Understanding of Erosion Forces • A Need for Better Highway Construction and Materials

PURPOSE • Highway 82 was damaged by hurricane when storm surge toped the highway • The damage Occurred in the north shoulder of the highway • The need arose to understand the physics behind this erosion.

ANSYS COMPUTER SIMULATION Twenty-Five Second Simulation Using Fluent Software to Simulate the Flow of Water Over a Road

ANSYS COMPUTATIONAL FLUID DYNAMICS (CFD) STUDY Velocity Magnitude Shear Force

EXPERIMENTAL STUDY • Validation for the Simulation Model • Experimental Study to Conduct On-Site Data • Data Loggers Record Water Pressure Variations

EXPERIMENTAL DESIGN • Test Structure by LA Ash , Inc. • Dimensional Design Structural Design • Strain Gage Placement • Test Structure Materials

TEST BED PLACEMENT AREA

DATA COLLECTION • Low Tide Levee Placement • High Tide Data Collection • Duration and Timing of Data Collection

TEST LEVEE Test Levee Structure Wave Crash on Test Levee

EXPERIMENTAL & SIMULATION DATA

EXPERIMENTAL VS. SIMULATION Low Frequency FFT High Frequency FFT

CONCLUSIONS • Study Provided Experimental Data to Support CFD Study • Study Revealed Hidden Velocities, Shear Forces, and Surface Pressures • Study Revealed Causes of Erosion

FUTURE RESEARCH • Correction of Erosion Causes • Road Construction Materials • Hard Barriers • Soft Barriers

ACKNOWLEDGEMENTS Louisiana Transportation Research Center LA Ash, Inc.

REFERENCES • Zhang, N. , Li, Z. , Klemetson, S. , Yadagiri, S. , 2010, CFD and Acoustical Analysis for Coastal Highway Erosion, 2010 ASME International Mechanical Engineering Congress & Exposition, November 12 -18, Vancouver, Canada, paper-No. IMECE 2010 -37142 • ANSYS FLUENT 12. 0/12. 1 Documentation • Brentner K. S. , Farassat, F. , An Analytical Comparison of the Acoustic Analogy and Kirchhoff Formulations for Moving Surface. AIAA Journal, 36(8), 1998 • Ffowcs-Williams J. E. , Hawkings, D. L. , Sound Generation by Turbulence and Surfaces in Arbitrary Motion. Proc. Roy. Soc. London, A 264: 321 -342, 1969 • Howe, M. S. , Theory of Vortex Sound, Cambridge University Press, Cambridge • Geokon Embedment Strain Gage Model 3900 Instruction Manual

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