Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 103, Issue -, Pages 131-145Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2018.02.008
Keywords
Coupled 1D-2D modelling; Hybrid parallelization; Hyper-resolution; LiDAR
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Funding
- Korea Meteorological Institute (KMI) [APCC12-01] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Coupled 1D-2D modelling is a widely used approach to predict water movement in complicated surface and subsurface drainage systems in urban or peri-urban areas. In this study, a hybrid parallel code, H12, is developed for 1D-2D coupled urban flood modelling. Hybrid-1D-2D, or H12, enables street-resolving hyper-resolution simulation over a large area by combining Open Multi-Processing (OpenMP) and Message Passing Interface (MPI) parallelization. Variable grid sizing is adopted for detailed geometric representation of urban surfaces as well as efficient computation. To assess the capability of H12, simulation experiments were carried for the Johnson Creek Catchment (similar to 40 km(2)) in Arlington, Texas. The LiDAR-derived digital elevation model (DEM) and detailed land cover map at 1-m resolution are used to represent the terrain and urban features in flood modelling. Hybrid parallelization achieves up to a 79-fold reduction in simulation time compared to the serial run and is more efficient than either OpenMP or MPI alone especially in hyper-resolution simulations. (c) 2018 Elsevier Ltd. All rights reserved.
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