Urban flash-flood risk assessment: A case study inWenshan City, Yunnan
Received date: 2009-08-17
Revised date: 2009-12-22
Online published: 2010-04-20
For the vulnerability reduction of mountainous cities affected by flood hazards, flash-flood risk assessment is very important for flood disaster mitigation measures. This paper explores a quick, simple and accurate GIS and RS based method for flash-flood risk assessment. With the flood for 20 return period occurring on July 26th, 1998 as a case, the study shows that through the inundation analysis carried out by combining DEM and actually observed floodwater level and maximum discharge runoff, the possibly inundated area can be accurately simulated and water depth distribution can be calculated within inundated area. Based on water depth index, flood hazard zonation was finished by using the GIS tool. This paper conducted cost calculation based on information of inundated ground objects acquired from remotely sensed image of high spatial resolution so as to provide the reliable and accurate data source for vulnerability analysis and flood expected damage estimation. According to the sampling survey for the property loss of the typical zones within the inundated area in 1998, this study established the relationship between different flooded object types and floodwater depth, and defined flood damage ratio on this basis. The adopted new methodology, namely the integration with the function of GIS spatial data processing and analysis greatly simplified the complex damage estimation and improved its accuracy. Flash-flood risk assessment can be completed by dividing the expected degree of loss due to potentially damaging phenomena. The study results show that the GIS and RS based method performs well in flash-flood risk assessment, thus it can be widely used for other inundated areas.
Key words： urban flash-flood; GIS; hazard zonation; loss estimation; risk assessment
ZHU Jing . Urban flash-flood risk assessment: A case study inWenshan City, Yunnan[J]. GEOGRAPHICAL RESEARCH, 2010 , 29(4) : 655 -664 . DOI: 10.11821/yj2010040008
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