An integrated GPU-accelerated modeling framework for high-resolution simulations of rural and urban flash floods. (October 2022)

• Record Type: Journal Article
• Authors: Buttinger-Kreuzhuber, Andreas; Konev, Artem; Horváth, Zsolt; Cornel, Daniel; Schwerdorf, Ingo; Blöschl, Günter; Waser, Jürgen
• Is Part Of: Environmental modelling & software. Volume 156(2022)
• Publication Date: 2022-10
• Subjects: Spatially distributed rainfall–runoff model -- GPU acceleration -- Dual drainage -- Surface–sewer coupling -- Flash flood hazard modeling; Environmental monitoring -- Computer programs -- Periodicals; Ecology -- Computer simulation -- Periodicals; Digital computer simulation -- Periodicals; Computer software -- Periodicals; Environmental Monitoring -- Periodicals; Computer Simulation -- Periodicals; Environnement -- Surveillance -- Logiciels -- Périodiques; Écologie -- Simulation, Méthodes de -- Périodiques; Simulation par ordinateur -- Périodiques; Logiciels -- Périodiques; Computer software; Digital computer simulation; Ecology -- Computer simulation; Environmental monitoring -- Computer programs; Periodicals; Electronic journals; 363.70015118
• DOI: 10.1016/j.envsoft.2022.105480
• Languages: English
• ISSNs: 1364-8152

Abstract

Abstract: This paper presents an integrated modeling framework aiming at accurate predictions of flood hazard from heavy rainfalls. The accuracy of such predictions generally depends on the complexity and resolution of the employed model components. We propose an integration of complementary models in one framework that facilitates GPUs to improve accuracy and simulation time. The spatially distributed runoff model integrates surface flow routing based on the full shallow water equations, infiltration based on the Green–Ampt equation, and interception. In urban areas, the runoff model is coupled with the Storm Water Management Model (SWMM). The integrated model is validated and tested on laboratory, rural and urban scenarios with regards to accuracy and computational efficiency. The GPU acceleration yields speedups of 1000 times compared to a CPU implementation and enables the coupled simulation of flash floods at 1 m resolution for an urban area of 200 km 2 in realtime. Highlights: An efficient, bidirectionally coupled model for surface and sewer flow simulation. A spatially distributed GPU-accelerated rainfall–runoff model. Validation and performance tests on rural and urban city-scale scenarios. Workload–accuracy tradeoff analysis regarding resolution versus discretization order.