Modelling Weirs in Two-Dimensional Shallow Water Models

Abstract

2D models based on the shallow water equations are widely used in river hydraulics. However, these models can present deficiencies in those cases in which their intrinsic hypotheses are not fulfilled. One of these cases is in the presence of weirs. In this work we present an experimental dataset including 194 experiments in nine different weirs. The experimental data are compared to the numerical results obtained with a 2D shallow water model in order to quantify the discrepancies that exist due to the non-fulfillment of the hydrostatic pressure hypotheses. The experimental dataset presented can be used for the validation of other modelling approaches.

Design of Drainage Downspouts Systems over a Road Embankment

“…Iber is a two-dimensional (2D) numerical tool for the simulation of free surface flows [26]. Initially originating from the academic realm, it was originally conceived for assessing hydrodynamics and sediment transport processes in river systems [27][28][29][30][31][32][33][34]. Presently, Iber boasts an integrated suite of calculation modules tailored to simulate a diverse array of environmental fluid phenomena.…”

Implementación de embalses en cálculos hidrológicos con Iber

“…La precisión de los modelos hidrodinámicos puede verse deteriorada por la presencia de estructuras hidráulicas que interrumpan la circulación del flujo. A escala local, la presencia de vertederos o puentes pueden presentar un desafío para los modeladores, especialmente para aquellos modelos basados en las 2D-SWE (García-Alén et al, 2021;Cea, Vila, et al, 2022). A escala de cuenca, uno de los elementos más relevantes son los embalses.…”

Analysis of two sources of variability of basin outflow hydrographs computed with the 2D shallow water model Iber: Digital Terrain Model and unstructured mesh size

“…In order to capture the potential effects that hydraulic structures, such as bridges or weirs, have on the propagation of the flood, it is required a high resolution numerical model (e.g., Macchione and Lombardo, 2021). Although at the local scale the hydrostatic pressure approximation (essential assumption in 2D-SWE models) is not valid in the surroundings of these structures, these models still provide reliable results at the catchment scale (García-Alén et al, 2021;Luis et al, 2022). In the definition of the computational mesh of the model, despite recent advances in High Performance Computing (HPC) (García-Feal et al, 2018;Lacasta et al, 2015;Petaccia et al, 2016;Sanders and Schubert, 2019;Vacondio et al, 2014;Xia et al, 2019), modellers often have to make a balance between a fine mesh that correctly reproduces the topography of the terrain (Costabile and Macchione, 2015) and a feasible computational cost.…”