Combined wave and surge overtopping erosion failure model of HPTRM levees: Accounting for grass-mat strength

OCEAN ENGINEERING

卷:109

Article

Yuan, Saiyu¹  Tang, Hongwu¹  Li, Lin²  Pan, Yi³  Amini, Farshad² 

[1] Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China

[2] Jackson State Univ, Dept Civil & Environm Engn, Jackson, MS 39217 USA

[3] Hohai Univ, Coll Harbour Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China

关键词: Combined storm surge overflow and wave overtopping;    High performance turf reinforcement mat;    EFA;    Failure model;    Levee;   

DOI  :  10.1016/j.oceaneng.2015.09.005

来源: Elsevier

【 摘 要 】

High performance turf reinforcement mat (HPTRM) has emerged as an effective and flexible strengthening system to protect earthen levees against the erosion caused by overtopping flows. The purpose of this study is to characterize the erosion and failure processes of HPTRM-strengthened levees under combined wave and surge overtopping. The Erosion Function Apparatus (EFA) is used to analyze the erodibility of HPTRM-strengthened clay. The erodibility parameters such as critical shear stress and erodibility coefficient are then obtained. A HPTRM-element model is proposed to account for the mechanism of HPTRM in protecting cohesive soil with the help of EFA results in the characterization of the grass mat strength parameter. At last, a failure model is developed based on the excess stress equation, and the durations of HPTRM-strengthened levees against combined overtopping with different wave heights and freeboards are presented. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

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