Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 88, Issue -, Pages 119-137Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2016.11.012
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Funding
- Ministry of Education, Universities and Research [RBSI14R1GP, D92I15000190001]
- CINECA, NVIDIA under the CUDA Research Center Program [P-FLOOD2-HP10CHAL0S]
- INDAM/GNCS
- INdAM - GNCS Project
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A GPU-parallel numerical model for the solution of the 2D Shallow Water Equations, based on a novel type of grid called Block-Uniform Quadtree (BUQ), is presented. BUQ grids are based on a data structure which allows to exploit the computational capability of CPUs with minimum overheads, while discretizing the domain with non-uniform resolution. Different cases have been simulated in order to assess the efficiency of the BUQ grids. Theoretical and laboratory tests demonstrate that speed-ups of up to one order of magnitude can be achieved in comparison with uniform Cartesian grids. In the simulation of a hypothetical flood event induced by a levee breach in a real 83 km long river reach, with maximum resolution of 5 m, a ratio of physical to computational time of about 12 was obtained, opening scenarios of quasi real-time 2D simulations in large domains, still retaining a high resolution where necessary. (C) 2016 Elsevier Ltd. All rights reserved.
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