| Title |
New Flood Hazard Mapping using Runoff Mechanism on Gamcheon Watershed |
| Authors |
김태형(Kim, Tae Hyung) ; 한건연(Han, Kun Yeun) ; 박준형(Park, Jun Hyung) |
| DOI |
https://doi.org/10.12652/Ksce.2016.36.6.1011 |
| Keywords |
홍수위험지도;유출생성;유출누적;유출인자;TOPSIS 기법 Flood hazard map;Runoff production;Runoff accumulation;Runoff indices;TOPSIS method |
| Abstract |
This study performs the potential flood hazard analysis by applying elevation data, soil data and land use data. The susceptibility maps linked to elevation, soil and land use are combined to develop the new types of flood hazard map such as runoff production map and runoff accumulation map. For the development of the runoff production map, land use, soil thickness, permeability, soil erosion and slope data are used as runoff indices. For the runoff accumulation map, elevation, knick point and lowland analysis data are used. To derive an integrated type of flood potential hazard, a TOPSIS (The Technique for Order of Preference by Similarity to Ideal Solution) technique, which is widely applied in MCDM (Multi-Criteria Decision Making) process, is adopted. The indices applied to the runoff production and accumulation maps are considered as criteria, and the cells of analysis area are considered as alternatives for TOPSIS technique. The model is applied to Gamcheon watershed to evaluate the flood potential hazards. Validation with large scale data shows the good agreements between historical data and runoff accumulation data. The analysis procedure presented in this study will contribute to make preliminary flood hazard map for the public information and for finding flood mitigation measures in the watershed. |