Journal
JOURNAL OF HYDROLOGY
Volume 562, Issue -, Pages 789-795Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhydrol.2018.05.017
Keywords
Rainfall; Overland flow; Lattice Boltzmann method; Equation Scheme; Equilibrium Scheme; Source term
Funding
- National Key RD Program [2016YFC0500402]
- National Natural Science Foundation of China [51779011]
- Open Fund of State Key Laboratory of Hydraulics and Mountain River Engineering [SKHL1518]
- China Scholarship Council (CSC)
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Complex rainfall situations can generate overland flow with complex hydrodynamic characteristics, affecting the surface configuration (i.e. sheet erosion) and environment to varying degrees. Reliable numerical simulations can provide a scientific method for the optimization of environmental management. A mesoscopic numerical method, the lattice Boltzmann method, was employed to simulate overland flows. To deal with complex rainfall, two schemes were introduced to improve the lattice Boltzmann equation and the local equilibrium function, respectively. Four typical cases with differences in rainfall, bed roughness, and slopes were selected to test the accuracy and applicability of the proposed schemes. It was found that the simulated results were in good agreement with the experimental data, analytical values, and the results produced by other models.
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