The Sponge City concept has been promoted as a major programme of work to address increasing flood risk in urban areas, in combination with wider benefits for water resources and urban renewal. However, realization of the concept requires collaborative engagement with a wide range of professionals and with affected communities. Visualization can play an important role in this process. In this research, a sponge city flood simulation and forecasting system has been built which combines hydrological data, topographic data, GIS data and hydrodynamic models in real-time and interactive display in a three-dimensional environment. Actual and design flood events in a pilot sponge city have been simulated. The validation results show that the simulated urban water accumulation process is consistent with the actual monitoring data. Use of advanced virtual reality technology can enable simulations to be placed in the wider design context including enhanced awareness of multiple functions of urban ecosystems. This procedure can therefore reduce the information communication gap and encourage innovation regarding low impact development required for sponge city construction.

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The objective of this paper is to report on the development of prototype models for use in raising public awareness of changes in urban areas, focusing on greenspaces, and testing responses to scenarios of change. Specifically, the focus is on the design of appropriate types of outdoor features for community planning and engagement. This modelling is fulfilled using the Autodesk Maya, Google SketchUp and ArcGIS software packages together in a novel combination of spatial and visualisation tools. The experiment results show evidence that different types of 3D iconic symbols with interactive communication will influence participation and decision making in land use planning.

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