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Erosion Resistance of HPTRM Strengthened Levee from Combined Wave and Surge Overtopping
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Erosion Resistance of HPTRM Strengthened Levee from Combined Wave and Surge Overtopping
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Journal Article
Erosion Resistance of HPTRM Strengthened Levee from Combined Wave and Surge Overtopping
2014
Overview
Post-Katrina investigations revealed that most earthen levee damage occurred on the levee crest and land-side slope as a result of either wave overtopping, storm surge overflow, or a combination of both. This study addresses erosion resistance performance of a levee strengthening technique—high performance turf reinforcement mat under combined wave and surge overtopping conditions using full-scale flume tests as well as erosion function apparatus (EFA) tests. Based on the results of full-scale flume tests, an “upper limit” of soil loss is observed for certain flow conditions. Erosion rate was presented as a function of velocity and freeboard. The effect of duration of overtopping on the erosion depth is also determined. The results of EFA tests indicate that the presence of grass roots substantially improve the critical velocity and soil erodibility.
