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作者： Yifan Zhu Chao An Shanghai Jiao Tong University

We have developed an efficient tsunami numerical model with the multiple-nested grid system, for fast simulation of the whole life span of earthquake tsunamis. This model is based on the widely-used COMCOT(Cornell multigrid coupled tsunami model) which solves the nonlinear shallow water equations. The initial tsunami wave field is calculated using Okada' model(Okada,1985), and the contribution of horizontal seafloor displacement is incorporated(Tanioka&Satake,1996). Then tsunami propagation and inundation are simulated in a series of dynamically-coupled rectangular grid regions. We adopt the moving boundary technique proposed by Cho et al.(2009) to solve tsunami inundation over a discontinuous topography. This set of program is parallelized with OpenMPI for implementation on highperformance computers. Finally, our model is tested in two cases. In the first case, the oscillatory motion of water in a paraboloidal basin is simulated, and the result is compared with the analytical solution. In the other case, the predicted maximum run-up heights along the eastern coast of Japan in 2011 Tohoku earthquake are compared with field survey data. Our model provides reasonably accurate predictions for both the simplified case and the realistic tsunami scenario.

关键词： Tsunami simulation nested grid OpenMPI

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An Efficient Approach for Simulation of Water Levels due to the Nonlinear Interaction of Tide and Surge Along the Coast of Bangladesh

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China Ocean Engineering 2020年第4期34卷 537-546页

作者： Gour Chandra Paul Sukumar Senthilkumar Rana Pria Department of Mathematics University of RajshahiRajshahi-6205Bangladesh School of Mathematical Sciences Universiti Sains MalaysiaPulau Pinang-11800Malaysia Mathematics Discipline ScienceEngineering&Technology SchoolKhulna UniversityKhulna-9208.Bangladesh

The ultimate goal and highlight of this paper are to explore water levels along the coast of Bangladesh efficiently due to the nonlinear interaction of tide and surge by employing the method of lines(MOLs)with the aid of newly proposed RKAHeM(4,4)*** this regard,the spatial derivatives of shallow water equations(SWEs)were discretized by means of a finite difference method to obtain a system of ordinary differential equations(ODEs)of initial valued with time as an independent *** obtained system of ODEs was solved by the RKAHeM(4,4)***-way nested grid technique was exercised to incorporate coastal complexities closely with minimum computational cost.A stable tidal oscillation was produced over the region of interest by applying the most influential tidal constituent M2 along the southern open boundary of the outer *** newly developed model was applied to estimate water levels due to the non-linear interaction of tide and surge associated with the catastrophic cyclone April 1991 along the coast of *** approach employed in the study was found to perform well and ensure conformity with real-time observations.

关键词： method of lines RKAHeM(4 4)technique error estimation storm surge nested grid

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Storm surge simulation along the Meghna estuarine area:an alternative approach

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Acta Oceanologica Sinica 2018年第1期37卷 40-49页

作者： PAUL Gour Chandra SENTHILKUMAR Sukumar PRIA Rana Department of Mathematics University of Rajshahi School of Mathematical Sciences Universiti Sains Malaysia Mathematics Discipline Khulna University

In this study, numerical prediction of surges associated with a storm was made through the method of lines（MOL） in coordination with the newly proposed RKARMS（4, 4） method for the meghna estuarine region, along the coast of Bangladesh. For this purpose, the vertically integrated shallow water equations（SWEs） in Cartesian coordinates were firstly transformed into ordinary differential equations（ODEs） of initial valued, which were then soloved using the new RKARMS（4, 4） method. nested grid technique was employed for resolving the complexities of the region of interest with minimum cost. Fresh water discharge through the lower Meghna River was taken into account along the north east corner of the innermost child scheme. Numerical experiments were performed with the severe cyclone on April 1991 that crossed the coast over the study area. Simulated results by the study were found to be in good agreement with some reported data and were found to compare well with the results obtained by the MOL in addition with the classical 4th order Runge-Kutta（RK（4, 4）） method and the standard finite difference method（FDM）.

关键词： method of lines storm surge nested grid finite difference method RKARMS (4, 4) method truncation errors

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