A study on flood risk assessment approach based on multi-source geographic data integration and GIS methods: A case study of lower Han River region

Floods are one of the most frequent disasters in nature, which may result in serious threats to people´s lives and property. In this paper, the approach of multi-source geographic data integration in flood risk assessment is developed for evaluating the impact on buildings of flood disaster under given flood frequency. First, the inundation model is employed to obtain flood risk maps, including both the inundation area and depth. Then, buildings information is extracted from Landsat-TM remote sensing images. Finally, the inundation area and buildings data have been integrated in GIS, and the damage assessment model has been developed to evaluate damage ratio according to different flood pre-warning time.