170478 20260422085545.0 doi 10.5194/gmd-19-2799-2026 sideral 148972 ART-2026-148972 eng Zheng, Na High-performance coupled surface-subsurface flow simulation with SERGHEI-SWE-RE 2026 This work presents SERGHEI-SWE-RE, a performance-portable, parallel model that couples a fully dynamic two-dimensional Shallow Water Equation (SWE) solver with a three-dimensional Richards Equation (RE) solver within the Kokkos framework to simulate surface–subsurface flow exchange. The model features a modular architecture with sequential coupling strategy, supporting both synchronous and asynchronous executions of surface and subsurface modules. The SERGHEI-SWE-RE model is validated against five benchmark problems incorporating stationary and fluctuating free-surface tests, a tilted v-catchment, a lateral-flow slope without ponding, and a heterogeneous superslab. The results demonstrate good agreement with established models. Asynchronous coupling reduces wall-clock time by up to about 75 % in the superslab case while preserving simulation accuracy. Strong and weak scaling tests on multiple Intel Xeon CPUs and NVIDIA GPUs reveal robust portability, with near-ideal RE scaling and less-satisfactory SWE scaling at high GPU counts, suggesting future improvements on differentiated meshes or more advanced domain decomposition strategies. Overall, the results presented establish SERGHEI-SWE-RE as an efficient, flexible and scalable model for integrated surface-subsurface flow simulations. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Li, Zhi Rickert, Gregor Morales-Hernández, Mario Universidad de Zaragoza (orcid)0000-0001-6961-7250 Özgen-Xian, Ilhan Caviedes-Voullième, Daniel 5001 600 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Mecánica de Fluidos 19, 7 (2026), 2799-2819 GEOSCIENTIFIC MODEL DEVELOPMENT GEOSCIENTIFIC MODEL DEVELOPMENT 1991-959X 5176837 http://zaguan.unizar.es/record/170478/files/texto_completo.pdf Versión publicada 2598414 http://zaguan.unizar.es/record/170478/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:170478 articulos driver 2026-04-22-08:33:16 ARTICLE