Tree-based mesh-refinement GPU-accelerated tsunami simulator for real-time operation
<p>This paper presents a fast and accurate tsunami real-time operational model to compute across ocean-wide simulations completely on GPU (graphics processing unit). The spherical shallow water equations are solved using the method of characteristics and upwind cubic interpolation to provid...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-09-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://www.nat-hazards-earth-syst-sci.net/18/2561/2018/nhess-18-2561-2018.pdf |
| Summary: | <p>This paper presents a fast and accurate tsunami real-time
operational model to compute across ocean-wide simulations completely
on GPU (graphics processing unit). The spherical shallow water equations are solved using the method of
characteristics and upwind cubic interpolation to provide high accuracy and
stability. A customized, user interactive, tree-based mesh-refinement method
is implemented based on distance from the coast and focal areas to generate
a memory-efficient domain with resolutions of up to 50 m. Three
specialized and optimized GPU kernels (Wet, Wall and Inundation) are
developed to
compute the domain block mesh. Multi-GPU is used to further speed up the
computation, and a weighted Hilbert space-filling curve is used to produce a
balanced workload. Hindcasting of the 2004 Indonesian tsunami is presented
to validate and compare the agreement of the arrival times and main peaks at
several gauges. Inundation maps are also produced for Kamala and Hambantota
to validate the accuracy of our model. Test runs on three Tesla P100 cards
on Tsubame 3.0 could fully simulate 10 h in just under 10 min wall-clock time.</p> |
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| ISSN: | 1561-8633 1684-9981 |