To evaluate urban flood risk while considering spatial and temporal characteristics, this paper establishes an assessment method based on a coupled hydrodynamic model and a fuzzy comprehensive evaluation method. An assessment system is developed using hydrologic, social and economic factors. In addition, hydrology factors are obtained by the coupled hydrodynamic model. The hydrodynamic model is solved using the three-cascade method of the Saint-Venant equations for a river system, and the surface runoff is solved using a modified Roe-type approximate Riemann solver. The hydrology results are used as hydrologic factors and directly reflect the inundation of the subsequent assessment. Afterward, an analytic hierarchy process is used to calculate the weights of the assessment indices. Then, the urban flood risk is analyzed using the fuzzy comprehensive evaluation method. Five different rainfall events in Quzhou City are simulated and evaluated. The numerically computed results compare well with the statistical data and indicate an extreme inundation depth of more than 3 m. In addition, the assessment risk of Quzhou City is at level IV (high). This study shows that combining the assessment method with the coupled hydrodynamic model efficiently reflects the urban flood risk by considering flood, social and economic data.

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With the gradual refinement of urban space in China, the aesthetic quality of the urban visual environment has been getting more attention. Urban colour, one of the visual aesthetic elements, is a significant carrier of urban characteristics, sociocultural and history in cultural policies. As a type of cultural capital, it provides creative methods to approach problems of economic, environmental, social, and especially cultural sustainability. The interdisciplinary theory of urban planning is innovatively applied to guide, coordinate, and advance the sustainable production of urban colour in China. The objectives of this study are to: (a) explain the way urban colour is produced through the urban planning system in Chinese context; (b) elaborate affecting factors related to urban colour sustainability from the perspective of planning strategies and cultural policies; (c) propose sustainable planning strategies of urban colour production. To answer the above questions, we reviewed over 200 articles, plans, and official documents, and conducted several semi-structured interviews. The results show that the Chinese municipal government has regarded urban planning strategies and policies as a strategic tool for achieving sustainable urban colour development. Our discoveries would expend the research and application on the aesthetics of cities through the contextual analysis of Chinese urban colour planning system. By exploring the points of planning strategies and cultural policies, it also fills gaps in the literature on the sustainability of urban colour.