Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Study to Evaluate Impervious Area Ratio by Geographic Information Data

지리정보자료에 따른 불투수면적률 산정 결과에 대한 연구

  • Min Suh Chae (Department of Regional Construction Engineering, Kongju National University) ;
  • Kyoung Jae Lim (Department of Regional Construction Engineering, Kangwon National University) ;
  • Joong-Hyuk Min (Watershed and Total Load Management Research Division, National Institute Environmental Research) ;
  • Minji Park (Watershed and Total Load Management Research Division, National Institute Environmental Research) ;
  • Jichul Ryu (Research Strategy & Planning Division, National Institute Environmental Research) ;
  • Mijin Lee (Enviroment Business Dept, Sundosoft.Co.) ;
  • Sohyeon Park (Enviroment Business Dept, Sundosoft.Co.) ;
  • Youn Shik Park (Department of Regional Construction Engineering, Kongju National University)
  • 채민서 (공주대학교 지역건설공학과) ;
  • 임경재 (강원대학교 지역건설공학과) ;
  • 민중혁 (국립환경과학원 유역총량연구과) ;
  • 박민지 (국립환경과학원 유역총량연구과) ;
  • 류지철 (국립환경과학원 연구전략기획과) ;
  • 이미진 (선도소프트 환경사업부) ;
  • 박소현 (선도소프트 환경사업부) ;
  • 박윤식 (공주대학교 지역건설공학과)
  • Received : 2023.01.25
  • Accepted : 2023.02.22
  • Published : 2023.03.30
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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.

Keywords

Acknowledgement

This work was supported by a grant from the National Institute of Environment Research, funded by the Ministry of Environment of the Republic of Korea (NIER-2022-04-02-048).

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