1 LES Modeling of Tsunami-like Solitary Wave Processes 2 over Fringing Reefs 3 4 Yu Yao1, 4, Tiancheng He1, Zhengzhi Deng2*, Long Chen1, 3, Huiqun Guo1 5 6 1 School of Hydraulic Engineering, Changsha University of Science and Technology, 7 Changsha, Hunan 410114, China. 8 2 Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China. 9 3 Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of 10 Hunan Province, Changsha 410114, China. 11 4Key Laboratory of Coastal Disasters and Defence of Ministry of Education, 12 Nanjing, Jiangsu 210098, China 13 14 15 16 * Corresponding author: Zhengzhi Deng 17 E-mail:
[email protected] 18 Tel: +86 15068188376 19 1 20 ABSTRACT 21 Many low-lying tropical and sub-tropical reef-fringed coasts are vulnerable to 22 inundation during tsunami events. Hence accurate prediction of tsunami wave 23 transformation and runup over such reefs is a primary concern in the coastal management 24 of hazard mitigation. To overcome the deficiencies of using depth-integrated models in 25 modeling tsunami-like solitary waves interacting with fringing reefs, a three-dimensional 26 (3D) numerical wave tank based on the Computational Fluid Dynamics (CFD) tool 27 OpenFOAM® is developed in this study. The Navier-Stokes equations for two-phase 28 incompressible flow are solved, using the Large Eddy Simulation (LES) method for 29 turbulence closure and the Volume of Fluid (VOF) method for tracking the free surface. 30 The adopted model is firstly validated by two existing laboratory experiments with 31 various wave conditions and reef configurations. The model is then applied to examine 32 the impacts of varying reef morphologies (fore-reef slope, back-reef slope, lagoon width, 33 reef-crest width) on the solitary wave runup.