Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
권호 표지
DOI QR코드

DOI QR Code

Redetermining the curve number of Korean forest according to hydrologic condition class

수문학적 조건 등급에 따른 우리나라 산림의 유출곡선지수 재산정

  • Park, Dong-Hyeok (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Yu, Ji Soo (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Ahn, Jae-Hyun (Department of Civil Engineering, Seokyeong University) ;
  • Kim, Tae-Woong (Department of Civil and Environmental Engineering, Hanyang University (ERICA))
  • 박동혁 (한양대학교 대학원 건설환경공학과) ;
  • 유지수 (한양대학교 대학원 건설환경공학과) ;
  • 안재현 (서경대학교 공과대학 토목건축공학과) ;
  • 김태웅 (한양대학교 공학대학 건설환경공학과)
  • Received : 2017.06.29
  • Accepted : 2017.07.30
  • Published : 2017.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

The SCS-CN (Soil Conservation Service-Curve Number) method has been practically applied for estimating the effective precipitation. The CN is used to be determined according to the land use condition based on the US standard. However, there are two distinctive differences between U.S. and Korean land use conditions: mountainous (forest) and rice paddy area that cover more than 70% of the Korean territory. The previous work proposed to use 79 for rice paddy area, regardless of the soil type. Because US SCS's goal was originally to increase crops, the SCS classification standard provides only for woods and there are no criteria to distinguish the wood and forest. To determine the CN for forest, alternatively the U.S. Forest Service criteria have been employed in practice considering hydrologic condition class. In this study, we investigated the change of the forest CN using the observed rainfall - runoff data within the target area. The results indicated that the CN for forest was suitable for HC=1, and the corresponding CNs were redetermined between 54 and 55.

설계홍수량 산정을 위한 유효우량은 대부분 미국에서 개발된 SCS-CN 방법으로 계산된다. 이때 사용되는 토지이용상태에 따른 유출곡선지수 또한 미국의 기준을 토대로 결정된 것이다. 그러나 미국과 우리나라의 토지이용상태는 많은 차이가 있다. 특히 미국의 기준에는 우리나라의 면적의 70%를 차지하고 있는 산림(forest)과 담수재배하는 논에 대한 명확한 기준이 없다. 논의 경우, 이전의 연구결과를 바탕으로 논이 홍수기에 담수상태인 것을 고려하여 토양형에 관계없이 CN값을 79로 사용하고 있다. 산림의 경우 미국 SCS의 목적이 농작물 증산에 있었기 때문에 SCS의 분류 기준은 조성림에 해당하는 수림(woods)에 대한 기준만 제시하였다. 따라서 수자원 실무에서 산림에 대한 유출곡선지수를 결정하기 위해서 미국 산림청에서 개발한 방법을 이용하고 있다. 이것은 수문학적 조건 등급을 고려하여 결정하는 대안적인 방법이다. 본 연구에서는 굴운, 방림, 왕성동 지역의 실측된 강우-유출 자료를 이용하여 산림의 유출곡선 변화를 살펴보았다. 연구결과, 산림의 CN값은 HC=1의 등급이 적당하며, 그때의 유출곡선지수는 AMC-II 기준으로 수문학적 토양군 A는 54와 55가 적당한 것으로 나타났다.

Keywords

References

  1. Enderlin, H. C., and Markowitz, E. M. (1962). "The classification of the soil and vegetative cover types of California watersheds according to their influence on synthetic hydrographs." Presentation at Second Western National Meeting of the American Geophysical Union at Stanford University, Dec 27-29, 1962. 5 pp with attachments.
  2. Im, S. J., and Park, S. W. (1997). "Estimating runoff curve numbers for paddy fields." Journal of Korean Water Resources Association, Vol. 30, No. 9, pp. 379-387 (in Korean).
  3. Kim, J. H., Yoo, C. S., Park, M. J., and Joo, J. G. (2014). "Evaluation of problems to apply runoff curve number to mountain area in Korea." Journal of Korean Society of Hazard Mitigation, Vol. 14, No. 5 (Oct. 2014), pp. 293-298 (in Korean). https://doi.org/10.9798/KOSHAM.2014.14.5.293
  4. Kim, J. S., and Ahn, J. H. (2012). "A study on the selection of AMC of curve number." Journal of Wetlands Research, Vol. 14, No. 4 (2012. 11) pp. 519-535 (in Korean). https://doi.org/10.17663/JWR.2012.14.4.519
  5. KWRA (Korea Water Resources Association) (2002). River standards for design.explanation (in Korean).
  6. KWRA (Korea Water Resources Association) (2005). River standards for design.explanation (in Korean).
  7. KWRA (Korea Water Resources Association) (2009). River standards for design.explanation (in Korean).
  8. MLIT (Ministry of Land, Infrastructure, and Transport) (2013a). Nakdong River mater plan (in Korean).
  9. MLIT (Ministry of Land, Infrastructure, and Transport) (2013b). Youngsan River mater plan (in Korean).
  10. MLTM (Ministry of Land, Transport and Maritime Affairs) (2008). Geum River Basin comprehensive flood mitigation plan (in Korean).
  11. MLTM (Ministry of Land, Transport and Maritime Affairs) (2009). Nakdong River Basin comprehensive flood mitigation plan (in Korean).
  12. MLTM (Ministry of Land, Transport and Maritime Affairs) (2012a). Design flood estimation methods (in Korean).
  13. MLTM (Ministry of Land, Transport and Maritime Affairs) (2012b). Han River Basin comprehensive flood mitigation plan (in Korean).
  14. Park, D. H., Kang, D. S., Ahn, J. H., and Kim, T. W. (2016). "Redetermination of curve number using genetic algorithm and CN aligner equation." Journal of Korean Water Resources Association, Vol. 49, No. 5, pp. 373-380 (in Korean). https://doi.org/10.3741/JKWRA.2016.49.5.373
  15. USDA-NRCS (United States Department of Agriculture - Natural Resources Conservation Service) (2004). National Engineering Handbook, Part 630 Hydrology, Chapter 10: Estimation of direct runoff from storm rainfall, Washington DC.
  16. Yoon, Y. N. (2008). Elementary hydrology, Chungmungak.