| Title |
A Study to Evaluate Impervious Area Ratio by Geographic Information Data |
| Authors |
채민서 ( Min Suh Chae ) ; 임경재 ( Kyoung Jae Lim ) ; 민중혁 ( Joong-hyuk Min ) ; 박민지 ( Minji Park ) ; 류지철 ( Jichul Ryu ) ; 이미진 ( Mijin Lee ) ; 박소현 ( Sohyeon Park ) ; 박윤식 ( Youn Shik Park ) |
| DOI |
https://doi.org/10.15681/KSWE.2023.39.2.142 |
| Keywords |
GIS data; Impervious area ratio; Land cover; Land use |
| Abstract |
Infiltration is a process by which precipitation infuses into subsurface soils. The process determines the surface flow and baseflow volume, and it is one of most important hydrological processes regarding nonpoint source pollution management. Therefore, the Ministry of Environment has developed a guideline to determine the impervious area ratio to understand the hydrological process in administrative districts and watersheds. The impervious area ratio can be determined using land use or land cover maps. Three approaches were explored to determine the impervious area ratio in 25 districts in Seoul. The impervious area ratio was determined by employing the Land registration map and Land property data in the first approach, Land property map in the second approach, and Land cover map in the third approach. The ratio ranged from 38.96% to 83.01% in the first approach, 38.98% to 83.02% in the second approach, and 37.62% to 76.63% in the third approach. Although the ranges did not provide any significant differences in the approaches, some districts displayed differences up to 9.48% by the approach. These differences resulted from the fact that the data were land use or land cover, especially in the area of airport, residential complex area, and school sites. In other words, division of the pervious and impervious areas in an individual plot was not allowed in the Land registration map, while it was allowed in the Land cover map. Therefore, it was concluded that there is a need to revise the guideline so that a reasonable impervious area ratio can be determined in the districts. |