The numerical modelling of 2D shallow flows in complex geometries involving transient flow and movable boundaries has been a challenge for researchers in recent years. There is a wide range of physical situations of environmental interest, such as flow in open channels and rivers, tsunami and flood modelling, that can be mathematically represented by first-order non-linear systems of partial differential equations, whose derivation involves an assumption of the shallow water type. Shallow water models may include more sophisticated terms when applied to cases of not pure water floods, such as mud/debris floods, produced by landslides. Mud/debris floods are unsteady flow phenomena in which the flow changes rapidly, and the properties of the moving fluid mixture include stop and go mechanisms. The present work reports on a numerical model able to solve the 2D shallow water equations even including bed load transport over erodible bed in realistic situations involving transient flow and movable flow boundaries. The novelty is that it offers accurate and stable results in realistic problems since an appropriate discretization of the governing equations is performed. Furthermore, the present work is focused on the importance of the computational cost. Usually, the main drawback is the high computational effort required for obtaining accurate numerical solutions due to the high number of cells involved in realistic cases. However, the proposed model is able to reduce computer times by orders of magnitude making 2D applications competitive and practical for operational flood prediction. Moreover our results show that high performance code development can take advantage of general purpose and inexpensive Graphical Processing Units, allowing to run almost 100 times faster than old generation codes in some cases.
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Bates PD, De Roo APJ (2000) A simple raster-based model for flood inundation simulation. J Hydrol 236(1–2):54–77
Briggs MJ, Synolakis CE, Harkins GS, Green DR (1995) Laboratory experiments of tsunami runup on a circular island. Pure Appl Geophys 144(3–4):569–593
Brodtkorb AR, Saetra ML, Altikanar M (2012) Efficient shallow water simulations on GPUs: implementation, visualization, verification and validation. Comput Fluids 55:1–12
Bouchut F, Fernández-Nieto ED, Mangeney A, Lagrée PY (2008) On new erosion models of Savage–Hutter type for avalanches. Acta Mech 199(1–4):181–208
Caviedes-Voullième D, García-Navarro P, Murillo J (2012) Influence of mesh structure on 2D full shallow water equations and SCS curve number simulation of rainfall/runoff events. J Hydrol 448, 449:39–59
Caviedes-Voullième D, Morales-Hernández M, López-Marijuán IP, García-Navarro P (2014) Reconstruction of 2D river beds by appropriate interpolation of 1D cross-sectional information for flood simulation. Environ Model Softw 61:206–228
Juez C, Murillo J, García-Navarro P (2013) 2D simulation of granular flow over irregular steep slopes using global and local coordinates. J Comput Phys 255:166–204
Juez C, Murillo J, García-Navarro P (2014) A 2D weakly-coupled and efficient numerical model for transient shallow flow and movable bed. Adv Water Resour 71:93–109
Juez C, Lacasta A, Murillo J, García-Navarro P (2016) An efficient GPU implementation for a faster simulation of unsteady bed-load transport. J Hydraul Res 54(3):275–288
Lacasta A, Morales-Hernández M, Murillo J, García-Navarro P (2014) An optimized gpu implementation of a 2D free surface simulation model on unstructured meshes. Adv Eng Softw 78:1–15
Lacasta A, Juez C, Murillo J, García-Navarro P (2015) An efficient solution for hazardous geophysical flows simulation using GPUs. Comput Geosci 78:63–72
Meyer-Peter E, Müller R (1948) Formulas for Bed-Load Transport. In: Report on 2nd meeting on international association on hydraulic structures research, pp 39–64
Murillo J, García-Navarro P, Burguete J (2009) Time step restrictions for wellbalanced shallow water solutions in non-zero velocity steady states. Int J Numer Methods Fluids 60:1351–1377
Murillo J, García-Navarro P (2010) Weak solutions for partial differential equations with source terms: application to the shallow water equations. J Comput Phys 229:4327–4368
Murillo J, García-Navarro P (2012) Wave Riemann description of friction terms in unsteady shallow flows: application to water and mud/debris floods. J Comput Phys 231:1963–2001
NVIDIA (2011) NVIDIA CUDA C programming guide
Qian H, Cao Z, Liu H, Pender G (2018) New experimental dataset for partial dam-break floods over mobile beds. J Hydraul Res 56(1):124–135
Sanders BF, Schubert JE, Detwiler RL (2010) Parbrezo: a parallel, unstructured grid, Godunov type, shallow water code for high resolution flood inundation modeling at the regional scale. Adv Water Resour 33(12):1456–1467
Schubert JE, Sanders BF, Smith MJ, Wright NG (2008) Unstructured mesh generation and landcover-based resistance for hydrodynamic modeling of urban flooding. Adv Water Resour 31:1603–1621
Toro EF (2001) Shock-capturing methods for free-surface shallow flows. Wiley, New York
UK Environment Agency (2010) Benchmarking of 2D hydraulic modelling packages
Vacondio R, Aureli F, Mignosa P, Dal Pal A (2016) Simulation of the January 2014 flood on the Secchia River using a fast and high-resolution 2D parallel shallow-water numerical scheme. Nat Hazards 80(1):103–125
Vázquez-Cendón ME (1999) Improved treatment of source terms in upwind schemes for the shallow water equations in channels with irregular geometry. J Comput Phys 148:497–498
This work was partially funded by the MINECO/FEDER under research project CGL2015-66114-R and by Diputacion General de Aragon, DGA, through Fondo Europeo de Desarrollo Regional, FEDER. The third author also wants to thank to the MINECO for his Research Grant DI-14-06987.
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García-Navarro, P., Murillo, J., Fernández-Pato, J. et al. The shallow water equations and their application to realistic cases. Environ Fluid Mech 19, 1235–1252 (2019). https://doi.org/10.1007/s10652-018-09657-7
- Unsteady shallow flows
- Wetting/drying fronts
- Finite volumes
- River flows