Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 15, 381-391, 2015
https://doi.org/10.5194/nhess-15-381-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Mar 2015
Developing an effective 2-D urban flood inundation model for city emergency management based on cellular automata
L. Liu1,2, Y. Liu1, X. Wang1, D. Yu3, K. Liu1, H. Huang1, and G. Hu4 1Center of Integrated Geographic Information Analysis, School of Geography and Planning, Sun Yat-sen University, Guangzhou, PR China
2Department of Geography, University of Cincinnati, Cincinnati, Ohio, USA
3Centre for Hydrological and Ecosystem Science, Department of Geography, Loughborough University, Loughborough, UK
4School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geo-simulation, SunYat-sen University, Guangzhou, PR China
Abstract. 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.

Citation: Liu, L., Liu, Y., Wang, X., Yu, D., Liu, K., Huang, H., and Hu, G.: Developing an effective 2-D urban flood inundation model for city emergency management based on cellular automata, Nat. Hazards Earth Syst. Sci., 15, 381-391, https://doi.org/10.5194/nhess-15-381-2015, 2015.
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Short summary
This CA model can be easily established using commonly available basic urban geographic data with little preprocessing. It considers detailed urban features such as buildings and inlets, reproduces the changing extent and depth of flooded areas at the catchment outlet with an accuracy of 4 cm in water depth, and adequately represents the flow dynamics in the inundation process; furthermore, the model is computationally efficient for city emergency management.
This CA model can be easily established using commonly available basic urban geographic data...
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