Application scenarios and corresponding technical strategies of urban flood modeling

Urban flood modeling is a hot research topic in urban flood control and disaster mitigation around the world. Existing reviews on urban flood modeling are usually based on flooding process or calculation algorithms, but lacking a demand-oriented perspective. With the deepening demands on urban flood modeling, the application scenarios have become more and more complicated. Under various application scenarios, different processes are concerned, so new modeling technical strategies are needed, and different priorities and challenges are encountered. It is difficult to clarify these differences without considering the specific application scenario. According to modeling objectives and concerns, three typical application scenarios of urban flood modeling are deduced: modeling of urban fluvial/coastal floods, modeling of urban stormwater, and modeling of urban pluvial floods. Correspondingly, four technical strategies such as urban flood routing models, urban stormwater models, semi-distributed pluvial flood models and fully distributed pluvial flood models are developed specifically. Furthermore, different integrations of modeling technologies and their priorities, as well as the encountered challenges under different application scenarios and different technical strategies are also discussed. The present paper provides a comprehensive overview on urban flood modeling technologies from the viewpoint of application demands and hence provides a new perspective for urban flood modeling applications and researches.