Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Distribution characteristics of impervious area according to urban watershed development status and calculation of average impervious area ratio by land use

도시유역 개발상태에 따른 불투수면적 분포특성 및 토지용도별 평균불투수면적률 산정

  • Seonghwan Hwang (Technology Development Headquarter, Seoul Institute of Technology) ;
  • Youngran Kim (Technology Development Headquarter, Seoul Institute of Technology)
  • 황성환 (서울기술연구원 기술개발본부) ;
  • 김영란 (서울기술연구원 기술개발본부)
  • Received : 2022.11.14
  • Accepted : 2022.12.14
  • Published : 2022.12.15
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Abstract

This study was conducted to identify the distribution characteristics of the impervious area in urban watersheds and to reduce the deviation of the impervious area ratio that occurs depending on the degree of construction of land surface condition data. The average impervious area ratio by land use that can be applied to the calculation of the urban impervious area ratio was derived by statistically analyzing the distribution characteristics of the impervious area ratio by land use according to the urban watershed conditions. In urban watersheds, the change in impervious area ratio over the past 20 years has continuously increased in watersheds with an impervious area ratio of less than 60%, and decreased in watersheds with a high impervious area ratio of 60% or more. The average impervious area ratio by land use applicable to the land use technique is "Residential area" 84.0%, "Residential and commercial mix" 93.6%, "Commercial and business facilities" 89.8%, "Industrial land" 84.8%, "Public land" 47.3%, "Transportation facility" 93.3%, "Urban revitalization facility" 61.1%, "Bare land" 17.6%, "Special area" 11.4%, "Forest and open space" 3.5%, "Rivers and lakes" 9.2%. As a result of examining the adequacy of the average impervious area ratio by land use, the difference between the calculated value of the impervious area ratio using land use techniques and the actual impervious area ratio of the biotope map ranged from -3.0%p to 2.6%p at the significance level of 95%. In addition, when the watershed condition is applied, the difference ranged from -2.3%p to 1.7%p. By applying the average impervious area ratio by land use derived in this study, it was found that the impervious area ratio of the target urban watershed could be calculated within a deviation of ±3%p.

Keywords

Acknowledgement

이 논문은 2021년 서울시 불투수면 관리를 위한 생활쾌적성과 불투수면적률의 상관관계 분석 연구(2021-AC-012)의 지원으로 수행되었습니다.

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