163858 20251107115329.0 doi 10.5194/gmd-18-7399-2025 sideral 145829 ART-2025-145829 eng Vallés, Pablo Universidad de Zaragoza (orcid)0000-0001-8674-1042 SERGHEI v2.1: a Lagrangian model for passive particle transport using a two-dimensional shallow water model (SERGHEI-LPT) 2025 This paper presents a Lagrangian model for particle transport driven by a two-dimensional (2D) shallow water model, assuming that the particles have negligible mass and volume, are located at the free surface, and without interactions between them. Particle motion is based on advection and turbulent diffusion, which is added using a random-walk model. The equations for particle advective transport are solved using the flow velocity provided by a 2D shallow water solver and an online first-order Euler method, an online fourth-order Runge–Kutta method and an offline fourth-order Runge–Kutta method. The primary objective of this work is to present the capabilities of the new Lagrangian particle transport (LPT) model, while also providing an analysis of the accuracy and computational efficiency of the numerical schemes and their implementation for particle transport. To verify the accuracy and computational cost, several test cases inspired by laboratory set-ups are simulated. In this analysis, the Euler online method provides the best compromise between accuracy and computational efficiency. Finally, a localized precipitation event in the Arnás catchment is simulated to test the model's capability to represent particle transport in overland flow over irregular topography. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/T32-23R info:eu-repo/grantAgreement/ES/MICINN/PID2022-137334NB-I00 info:eu-repo/grantAgreement/ES/UZ/JIUZ2023-IA-04 info:eu-repo/grantAgreement/ES/UZ/PI-PRD/2022-03 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 Morales-Hernández, Mario Universidad de Zaragoza (orcid)0000-0001-6961-7250 Roeber, Volker García-Navarro, Pilar Universidad de Zaragoza (orcid)0000-0003-4444-778X Caviedes-Voullième, Daniel 5001 600 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Mecánica de Fluidos 18, 20 (2025), 7399-7416 GEOSCIENTIFIC MODEL DEVELOPMENT GEOSCIENTIFIC MODEL DEVELOPMENT 1991-959X Vallés, P., Caviedes-Voullième, D., and Morales-Hernández, M.: SERGHEI-LPT-RK, Zenodo [code] https://doi.org/10.5281/zenodo.14870918 Vallés, P., Caviedes-Voullième, D., and Morales-Hernández, M.: SERGHEI v2.1.0, Zenodo [code] https://doi.org/10.5281/zenodo.14871005 7018960 http://zaguan.unizar.es/record/163858/files/texto_completo.pdf Versión publicada 2513800 http://zaguan.unizar.es/record/163858/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:163858 articulos driver 2025-11-07-10:26:07 ARTICLE