Page - 447 - in Book of Full Papers - Symposium Hydro Engineering

2. ANALYSIS METHOD Dam Hydrological safety vulnerability for climate change ranking is calculated using hydrological safety 3 step assessment results and Climate impact factor for future climate results. Using the results of the existing 4 dams and 3 type method of Multi-Criteria Decision Making (MCDM). Location of 4 target dams was shown in Fig. 1. Three dams belong to the Han river, and one dam belongs to the nakdong river and the 3 target dam type was concrete dams and 1 dam type were fill dam. 2.1. HYDROLOGICAL SAFETY ASSESSMENT Hydrological dam safety has been currently evaluated depending on freeboard allowance, overflow and downstream hazard without any consideration of types, material and structural conditions. Hydrological safety assessment is made in three steps (MOLTL, 2011), The first step for safety evaluation is to check overflow possibility and freeboard allowance under the consideration of structural type and physical condition obtained from dam inspection results. Fill dam and CFRD(Concrete Faced Rock fill Dam) was applied to a more stable basis than concrete dam because of dam body safety difference when overflow. If the first step is not satisfied, structural safety evaluation for overflow condition should be carried out as a second step. The evaluation of downstream hazard including human and economical factors is the final step. The final step is assessed to downstream risk with reference to the EAP on the assumption that PMF occurs. Figure 1 Target dams location 447