Overland-gully-sewer (2D-1D-1D) urban inundation modeling based on cellular automata framework

A new overland-gully-sewer (2D-1D-1D) urban inundation modeling is herein proposed. The authors have developed an integrated approach for simulations, which comprises 2D overland flow (2D-OFM) by solving the two-dimensional non-inertia shallow water equations (2D-NISWEs), one-dimensional gully (1D-GFM), and sewer (1D-SFM). This can achieve good accuracy on simulations. Nevertheless, such physically-based with SWEs (2D-OFM-NISWEs) requires substantial computational procedures, so that it not suitable real-time evaluation of in areas. To resolve this limitation, present study proposes a modeling, cellular automata (CA) framework adopted 2D-OFM to improve its suitability, 1D-GFM 1D-SFM are modeled SWMM. novel linkage among 2D-OFM-CA, 1D-GFM, developed. theoretical comparison governing procedures between two approaches first conducted. Two historical flood events Taipei city next selected perform numerical verification efficiency evaluation. Analysis depths/velocities conducted, investigation drained surcharged/inversed discharges also made. comparisons indicate proposed maintain significant reduction computing time. newly finish 3 hours short-duration simulation case 335,621 cells within 12–17 mins. As result, CA-based proved be useful tool modeling.