A physically-based model for particle transport over urban road surface with consideration of raindrop erosion and runoff effect

Key Points

• Particle transport dynamics are altered by raindrop erosion on road surfaces, enhancing runoff effects.
• The model predicts significant erosion when raindrop impacts exceed 20 m/s, leading to increased particle dispersion.
• Using a physically-based model, the interaction between raindrop energy and road surface particles is explored in detail.
• Findings suggest that urban runoff management could be improved to mitigate erosion impacts on roads.