Cloud-Based Pipelined Nested Tsunami Modeling
- Kensaku Hayashi (University of Aizu) | Alexander P. Vazhenin (University of Aizu) | Andrey Marchuk (Tsunami Laboratory, ICMMG SB RAS)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- Cloud Computing, Nested Grids, Tsunami Modeling, Pipeline Computing
- 1 in the last 30 days
- 12 since 2007
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The paper describes the main features of the pipelined Tsunami Modeling Infrastructure supporting high-speed tsunami modeling on system with rather limited computational resources. The pipelining scheme is realized by distributing bathymetries over computational resources and synchronization of processing of each area using buffering of boundaries between areas. It also describes adopting this scheme to cloud-based computations allowing creating flexible and reconfiguring computational scheme with a variable set of modeling zones. Preliminary results of numerical modeling experiments are also presented.
The tsunami modeling can be considered as a heavy-computational problem requiring versatile approaches based on integration of them. The most known, accurate and widely used packages are TUNAMI described in Shuto et. al., (1995) and MOST presented in Titov, (1988) Titov, (1998), and Titov and Gonzalez, (1997). For obtaining results of the tsunami propagation, be more reliable (distribution of tsunami wave heights in a shelf zone), rather a small step of a computational grid (about tens meters) is necessary. If we simulate the tsunami propagation in the whole area including both a source zone and sites of the coast, we are interested in, using this small spatial grid step, then because of the stability condition we will be compelled to carry out calculation with a small time step. This will bring about a significant increase in the time of numerical calculation that is inadmissible in real-time calculations. Therefore it is necessary to carry out such calculations with the use of the computational grids whose spatial step decreases when approaching the coast.
This research is focused on designing a high-speed scheme for tsunami modeling used nested computing. The basis for this research is the original grid-switching algorithm modeling tsunami propagations described in Hayashi et. al., (2015). We have adopted the MOST package to a computational scheme in which tsunami wave parameters are transferred from a larger domain to the embedded smaller one by means of the boundary conditions. This allows decreasing the total amount of calculations by excluding unimportant coast areas from the calculation process.
|File Size||3 MB||Number of Pages||6|