[H-DS06] Tsunami and tsunami forecast

[HDS06-02] PCOMCOT: A High-efficiency Parallel Multi-grid Dispersive Tsunami Model Based on Shallow Water Equations Corrected by Non-hydrostatic Pressure

*Yifan Zhu¹, Chao An¹ (1.MOE Lab of Hydrodynamics, Shanghai Jiao Tong University)

Keywords:tsunami simulation, dispersion, wave breaking, nested grids, parallel computation

PCOCMOT is a parallel program for simulating the whole life span of dispersive tsunamis, including wave propagation, breaking and inundation. The development of PCOMCOT is motivated by the need for increasing both accuracy and efficiency of across-scale tsunami simulation. It is based on the shallow water model COMCOT (Cornell Multi-grid Coupled Tsunami) and the depth-integrated non-hydrostatic model, which accounts for dispersive effects with non-hydrostatic pressure.The main features of PCOMCOT include 1) semi-implicit finite-difference scheme to depth-integrated non-hydrostatic model in both Cartesian and Earth coordinates; 2) one-way and two-way grid nesting; 3) eddy-viscosity scheme for wave breaking; 4) moving boundary technique for inundation; 5) parallel implementation with MPI library. Our theoretical analysis demonstrates that the governing equations can yield dispersive results comparable to the classical Boussinesq equations. Several examples including laboratoty expriments and real tsunami events are used to validate the numerical model, and satisfactory performance in accuracy, stability and time-efficiency is obtained.