Turbulence Effect on Slope Stability of an Earthen Levee Strengthened by HPTRM Under Overtopping Conditions
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It is important to evaluate the slope stability of levees during the hurricane overtopping involving storm surge and wind generated wave conditions. The effect of turbulence on the slope stability of an earthen levee strengthened by high performance turf reinforcement mat is investigated in this study for the cases including storm surge, wave overtopping, and combined storm surge and wave overtopping conditions. The turbulence is treated as a random shear force starting from the front of the crest and moving to the toe of the landside of the earthen levee. In addition, the shear stress produced by the wave is also considered. The results show that turbulence has strong influence on the slope stability in the storm surge and combined storm surge and wave overtopping conditions. It is found that the peak turbulent force has much stronger effect on the factor of safety than the peak wave force in the case of a small peak wave force.
KeywordsSlope stability Hurricane Overtopping flow Strength reduction method Turf reinforcement mat
This research was funded by the Department of Homeland Security-sponsored Southeast Region Research Initiative (SERRI) at the Department of Energy’s Oak Ridge National Laboratory. The conclusions in this paper are solely those of the authors and do not necessarily reflect the opinions or policies of DHS. Endorsement by DHS is not implied and should not be assumed.
- Amini F, Li L (2012) Full-scale overtopping tests on three innovative levee strengthening systems. U.S. Department of Homeland Security, Washington, DCGoogle Scholar
- ASCE Hurricane Katrina External Review Panel (2007) The New Orleans hurricane protection system: what went wrong and why. American Society of Civil Engineers, RestonGoogle Scholar
- Goodrum R (2011) A comparison of sustainability for three levee armoring alternatives. Optimizing sustainability using geosynthetics. In: Koerner GR, Koerner RM, Ashley MV, Hsuan GY, Koerner JR (eds)The 24th annual GRI conference proceedings. Dallas, Texas, March 16, 2011, pp 40–47Google Scholar
- Kelley D, Thompson R (2008) Comprehensive hurricane levee design: development of the controlled overtopping levee design logic. SAME Technology Transfer Conference and Lower Mississippi Regional Conference, March 17–19, Vicksburg, MSGoogle Scholar
- Nadal NC, Hughes SA (2009) Shear stress estimates for combined wave and surge overtopping at earthen levees. Coastal and hydraulics engineering technical note ERDC/CHL CHETN-III-79, U.S. Army Engineer Research and Development Center, Vicksburg, MSGoogle Scholar
- Sturm TW (2001) Open channel hydraulics. McGraw-Hill, New YorkGoogle Scholar
- Yuan S, Li L, Amini F, Tang H (2014) Turbulence measurement of combined wave and surge overtopping over a full scale HPTRM strengthened levee. J Waterw Coast Ocean Eng ASCE 140(4):14-1-14. doi: 10.1061/(ASCE)WW.1943-5460.0000230