5TH International Congress on Technology - Engineering & Science - Kuala Lumpur - Malaysia (2018-02-01)

Assessment Of Landslide Vulnerability : Case Of Small And Medium Sized Cities

Globally, the frequency and intensity of heavy rainfall and temperature are rising due to Abnormal climate. Populations and buildings are concentrated in urban areas. So, they are exposed to natural disaster. Damages are also increasing by natural disaster. Landslide extremely affects metropolitan cities in short time. In order to reduce the damege caused by the landslide, it is necessary to predect and manage the landslide. The previous study conducted the landslide vulnerability assessment focused on metropolitan cities for predicting such as landslide. Howerver, small and medium sized cities are not safe from the risk of landslide disaseters. Metropolitan cities have dense building, excessive population density and large numbers of artificial slopes. small and medium sized cities have a few building and low population densities. Because of their different characteristics, it is necessary to construct an evaluation system suitable for the characteristics when we assess the landslide Vulnerability. In this study, we assessed physical vulnerability and socio-economic vulnerability in small and medium sized cities and it is expressed as a single vulnerability. We assessed Physical vulnerabilities by using the Flow-R model. Flow-R model estimates extent of landslide impact and value of impact pressure. This study identified the extent of landslide impact using DEM(Digital Elevation Model) data and landslide hazard map. The building structure was divided into concrete structure and non-concrete structure. We composed of vulnerable functions according to building structures respectively. Using the vulnerable function, the physical vulnerability was evaluated by calculating the impact pressure affecting the building. Socio-economic vulnerability assessments quantify demographic and social indicators, secondary damage indicators, disaster preparedness and response indicators from landslide disaster. There are various detailed indicators for each indicator. This study applied the AHP(Analytic Hierarchy Process) to get weights of indicators. Then, each evaluation data was multiplied with weight and normalized between 0 and 1 to synthesize physical vulnerability and socio-economic vulnerability assessments. The vulnerability can be identified by grading the normalized values. The result of this study is to evaluate the vulnerability of the landslide disaster to small and medium sized cities and to select the landslide hazard areas in small and medium cities. All small and medium sized cities data were collected to reselect hazardous area for landslide disaster. The risk level can be compared and analysed each small and medium sized city. The figure is shown in the result of the vulnerability assessment. It will be useful for establishing a disaster prevention facility or constructing evacuation manual for small and medium sized cities.
Kyungmin Kim, Sangdan Kim