NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-15-381-2015 Developing an effective 2-D urban flood inundation model for city emergency management based on cellular automata Liu L. 1 2 Liu Y. 1 Wang X. 1 Yu D. https://orcid.org/0000-0003-1350-0437 3 Liu K. 1 Huang H. 1 Hu G. 4 Center of Integrated Geographic Information Analysis, School of Geography and Planning, Sun Yat-sen University, Guangzhou, PR China Department of Geography, University of Cincinnati, Cincinnati, Ohio, USA Centre for Hydrological and Ecosystem Science, Department of Geography, Loughborough University, Loughborough, UK School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geo-simulation, SunYat-sen University, Guangzhou, PR China 04 03 2015 15 3 381 391 Copyright: © 2015 L. Liu et al. 2015 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://nhess.copernicus.org/articles/15/381/2015/nhess-15-381-2015.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/15/381/2015/nhess-15-381-2015.pdf

Flash floods have occurred frequently in the urban areas of southern China. An effective process-oriented urban flood inundation model is urgently needed for urban storm-water and emergency management. This study develops an efficient and flexible cellular automaton (CA) model to simulate storm-water runoff and the flood inundation process during extreme storm events. The process of infiltration, inlets discharge and flow dynamics can be simulated with little preprocessing on commonly available basic urban geographic data. In this model, a set of gravitational diverging rules are implemented to govern the water flow in a rectangular template of three cells by three cells of a raster layer. The model is calibrated by one storm event and validated by another in a small urban catchment in Guangzhou of southern China. The depth of accumulated water at the catchment outlet is interpreted from street-monitoring closed-circuit television (CCTV) videos and verified by on-site survey. A good level of agreement between the simulated process and the reality is reached for both storm events. The model reproduces the changing extent and depth of flooded areas at the catchment outlet with an accuracy of 4 cm in water depth. Comparisons with a physically based 2-D model (FloodMap) show that the model is capable of effectively simulating flow dynamics. The high computational efficiency of the CA model can meet the needs of city emergency management.

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