Flood area and damage estimation in Zhejiang, China

摘要

A GIS-based method to estimate flood area and damage is presented in this paper, which is oriented to developing countries like China, where labor is readily available for GIS data collecting, and tools such as, HEC-GeoRAS might not be readily available. At present local authorities in developing countries are often not predisposed to pay for commercial GIS platforms. To calculate flood area, two cases, non-source flood and source flood, are distinguished and a seed- Spread algorithm suitable for source-flooding is described. The flood damage estimation is calculated in raster format by Overlaying the flood area range with thematic maps and relating this to other socioeconomic data.