Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Suggestion of classification rule of hydrological soil groups considering the results of the revision of soil series: A case study on Jeju Island

토양통 개정 결과를 반영한 수문학적 토양군 분류 방법 제시: 제주도를 대상으로

  • Lee, Youngju (Department of Water Resources, Korea Engineering Consultants Corporation) ;
  • Kang, Minseok (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Park, Changyeol (Department of Environmental and Urban Planning, Jeju Research Institute) ;
  • Yoo, Chulsang (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 이영주 ((주)한국종합기술 수자원부) ;
  • 강민석 (고려대학교 공과대학 건축사회환경공학부) ;
  • 박창열 (제주연구원 환경도시연구부) ;
  • 유철상 (고려대학교 공과대학 건축사회환경공학부)
  • Received : 2018.10.10
  • Accepted : 2018.11.15
  • Published : 2019.01.31
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Abstract

This study proposes a new method for categorizing the hydrological soil groups by considering the recent revision results of soil series. Also, the proposed method is evaluated by comparing the categorizing result with those based on existing three different methods. As an example, the proposed method is applied to Jeju Island to estimate the CN value, which is then compared with CN values estimated by applying the existing three different methods. Summaries of the results are as follow. (1) The revision result since 2007 shows that the soil texture has been changed in the 43 soil series, the drainage class in the 1 soil series, the permeability in the 15 soil series, and the impermeable layer in the 26 soil series. (2) The categorizing result of hydrological soil groups by applying the proposed method shows that the group B is the most dominant group covering up to 49.25%. On the other hand, one of the existing method of 1987 provides the group C as the most dominant group (46.43%). Method of 1995 defines the group B as the most dominant group (27.69%). The other method of 2007 distinguishes the group D (35.82%) to be the most dominant group. (3) Also, the CN value estimated by applying the proposed method to Jeju Island is found to be smaller than those based on existing three methods. This result indicates the possible overestimation of the CN value when applying the existing three methods.

본 연구에서는 최근의 토양통 개정 결과를 반영하여 제주도를 대상으로 새로운 수문학적 토양군 분류 방법을 제시하였다. 또한 제시한 수문학적 토양군 분류 방법은 기존의 수문학적 토양군 분류 방법과 비교하여 평가하였다. 이를 위해 본 연구에서 제시한 수문학적 토양군 분류 방법과 기존의 수문학적 토양군 방법들을 적용하여 제주도 전체 유역을 대상으로 CN 값을 산정하고 그 결과를 비교하였다. 그 결과를 정리하면 다음과 같다. (1) 2007년 이후 개정된 토양통을 기존 토양통과 비교한 결과, 토성은 43개의 토양통에서, 배수등급은 1개의 토양통에서, 투수속도는 15개의 토양통에서, 불투수층 깊이는 26개의 토양통에서 변경된 것으로 확인되었다. (2) 개정된 토양통을 반영하여 제주도의 수문학적 토양군을 분류한 결과, 1987년의 분류 방법을 따를 경우에는 수문학적 토양군 C군(46.43%)이 가장 많이 나타나나, 1995년의 분류 결과에서는 B군(27.69%)이, 2007년의 분류 결과에서는 D군(35.82%)이, 본 연구에서 제시한 분류 결과에서는 B군(49.25%)이 가장 많이 나타나는 것으로 나타났다. (3) 본 연구에서 제시한 방법을 제주도 전체에 적용한 경우에 추정된 CN 값은 기존 방법에 의한 값보다 작은 것으로 나타났다. 이 결과는 기존 방법을 적용할 경우 CN 값이 과대 추정되었을 가능성을 제시하는 것이기도 하다.

Keywords

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Fig. 1. Distribution of soil types in Jeju Island

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Fig. 2. Classification results of hydrological soil group in Jeju Island

Table 1. Soil types and characteristics in Jeju Island

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Table 2. Classification of soil series according to soil orders (Moon et al., 2007)

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Table 3. Soil textures and soil characteristics of soil series

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Table 4. Change of hydrological soil group depending on the classification method

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Table 5. Ratios of area of hydrological soil groups in Jeju Island depending on the classification rules

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Table 6. Comparison of CN values estimated by applying three classification methods of hydrological soil group in Jeju Island

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Table 7. Established and revised year of soil series in Jeju Island

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Table 8. Changes in soil texture based on the revision of soil series

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Table 9. Scores according to the soil texture

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Table 10. Changes in drainage class based on the revision of soil series

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Table 11. Scores according to the drainage class

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Table 12. Changes in the permeability based on the revision of soil series

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Table 13. Scores according to the permeability

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Table 14. Changes in the impermeable layer based on the revision of soil series

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Table 15. Scores according to the depth of impermeable layer

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Table 16. Modification methods and results for re-classification of hydrological soil groups

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Table 17. Re-classification results of hydrological soil group by applying the revision of soil series

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Table 18. CN values in Jeju Island estimated by applying the revision of soil series

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