Integration of internet and a GIS-based flood simulation model in an urban context

摘要

Urbanization often is accompanied with increased overland flow, shorter time of concentration, and larger flooding area. The threat of flooding from such change can be serious concern both financially and environmentally to governments that are responsible for flood warning and flood damage reduction. It is critical to get accurate estimates of the place and extent of impacts to have quick and effective emergency response. This paper reports the development a flood warning system by integrating Internet, Geographic Information System, and the Runoff Curve Number (CN) method (TR55). It first delineates flooding areas in response to different rainfall amounts and/or land use scenarios, then overlays the flooding areas with other data layers to identify properties and streets potentially to be affected by the flooding event. Finally, results from the simulation and overlay analysis are published via Internet. This study demonstrates that based on the simulation of changes in land use patterns, the change of runoff and flooding areas can also be visualized on a temporal and spatial context. The system can be used to estimate the impact of land development on flooding events, therefore, to support better planning and development decisions.