Simulation of Flood Inundation of Guiyang City Using Remote Sensing, Gis and Hydrologic Model

This paper illustrates an example of developing a grid-based distributed hydrologic model for storm-inundation simulation using GIS and remote sensing for flood emergency planning, and the feasibility of the model was explored in the mountainous urban area of Guiyang city of the Guizhou Province, China. The research was based on four major steps. The first step was to prepare data for the model, such as the grids of the city, land cover/land use of each grid from Landsat ETM+ image, and DEM from the 1:500 digital maps. The second step involved the calculation of the land overflow caused by rainstorm using SCS TR-55 model and routing the spatially distributed land overflow with a D∞ algorithm and Manning equation. The third and the final steps concern implementing of the simulation and mapping based on the simulation respectively. The model was validated using in situ water level measurements on July 11th 2005 when storm occurred over the city and a correlation coefficient of 0.67 is attained, so the model can be applicable to mountainous cities like Guiyang. The result of the research show that remote sensing, GIS and hydrological models can be integrated to solve hydrological problems.