FURTHER DEVELOPMENT AND VALIDATION OF SMOOTHED PARTICLE HYDRODYNAMICS METHOD FOR SIMULATION OF RAINFALL RUNOFF AND INUNDATION

Abstract

 The Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) method which was previously applied to rainfall-runoff simulation on natural topography has been reformulated to enable simulation of the motion of discontinuous patches of surface water due to a rainfall. The reformulationn indicates the basic equations of the original WCSPH may be used but suggest more logical modellong of the dynamics as the interaction with neighbouring fluid, the ground solid bodies. Unlike depth-averaged flow analyses the water depth is not the main variable in the governing equation but can be obtained by a separate post processing that considers the relation of the real water depth and the distribution of lumps of water for which the governning equations are applied. The simulation of overland flow on an urban terrain with model buildings are correctly simulated and the method is found to represent three-dimensional flow correctly.