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2026 Vol.27, Issue 1 Preview Page
Analysis of Runoff and Sediment Yield Reduction Effects According to NbS Scenarios: A Case Study of the ‘Cheoncheon Watershed’ in the Yongdam Dam Basin

NbS 시나리오에 따른 유역 유출량 및 유사유출량 저감효과 분석: 용담댐 ‘천천 유역’을 대상으로

Jinhyeong Lee1
,
Giha Lee2
,
Minho Yeon3*
이 진형1
,
이 기하2
,
연 민호3*
1Ph.D. Student, School of Advanced Science and Technology Convergence, Kyungpook National University
2Professor, School of Advanced Science and Technology Convergence, Kyungpook National University
3Post-doctoral Researcher, Climate Crisis Institute, Kyungpook National University
*Corresponding Author
1 January 2026. pp. 33-43
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Abstract

Approximately 70% of South Korea’s land area is composed of steep mountainous terrain, which leads to dominant surface runoff and intensive soil erosion within short durations during rainfall events. As climate change increases the frequency of extreme precipitation, runoff and sediment yield are projected to rise, emphasizing the need for Nature-based Solutions (NbS) that integrate environmental and ecological perspectives into watershed-scale sediment management. This study investigated the reduction effects of land cover conversion, a key NbS technique, on runoff and sediment yield in the Cheoncheon watershed, located upstream of the Yongdam Dam. The analysis revealed that peak runoff was reduced by 3.34% to 13.62%, while total runoff decreased by 3.39% to 9.03%, demonstrating significant effectiveness in flood mitigation. Additionally, land cover conversion markedly influenced sediment control, reducing peak sediment yield by 3.35% to 26.22% and total sediment volume by 6.74% to 19.50%. By providing a quantitative evaluation of land cover conversion as an NbS strategy, this study provides a foundational basis for establishing comprehensive, watershed-scale sediment management strategies in the future.

Keywords
Nature-based solutions
Land cover change
Cheoncheon watershed
Runoff reduction
Sediment yield reduction

우리나라는 국토의 약 70%가 산악지형으로 이루어진 급경사 지역으로 구성되어 있어, 강우 발생 시 지표유출이 우세하게 나타나며, 단시간 내 다량의 토양침식이 발생하는 특성을 가진다. 특히 기후변화로 인해 극한 강우의 발생 빈도가 증가하는 추세에 따라 유출량 및 유사유출량 또한 지속적으로 증가할 것으로 전망된다. 이러한 홍수 및 토사유출 피해 저감을 위해서는 환경적·생태적 측면을 고려한 유역 단위의 자연성 기반 해법(Nature-based Solutions, NbS)에 기초한 토사관리 방안의 도입이 필요하다. 이에 본 연구에서는 용담댐 상류에 위치한 천천 유역을 대상으로, NbS 기법 중 토지피복전환에 따른 유출량 및 유사유출량 저감 효과를 분석하였다. 연구 결과, 첨두 유출량은 최소 3.34%에서 최대 13.62%까지 저감되었으며, 총 유출량 또한 3.39%에서 9.03% 범위로 감소하여 홍수 피해 예방에 효과가 있는 것으로 나타났다. 또한 유사유출량의 경우 첨두치는 3.35%에서 26.22%, 총량은 6.74%에서 19.50%까지 저감되어 토사유출 저감에 있어 토지피복전환이 큰 영향을 미치는 것으로 분석되었다. 본 연구는 NbS 기법 중 토지피복전환 적용에 따른 유출량 및 유사유출량 저감 효과를 정량적으로 제시하였으며, 향후 유역 단위 NbS 기반 토사관리 전략 수립을 위한 기초자료로 활용될 수 있을 것으로 판단된다.

키워드
자연성기반해법(NbS)
토지피복전환
천천 유역
유출량 저감
유사유출량 저감
References
1

Gou, W., Li, H., Du, Y., Yin, H., Liu, F. and Lian, J. (2018), Effect of sediment concentration on hydraulic characteristics of energy dissipation in a falling turbulent jet, Applied Sciences, Vol. 8, No. 9, pp. 1672.

10.3390/app8091672
2

Haftu, M., Gidey, E., Mhangara. P. and Dikinya, O. (2025), Exploring the relationship between annual soil loss and formation rate in different land use scenarios using support vector machine (SVM) learning models in Tigray Highlands, Scientific Reports, Vol. 15, No. 1, pp. 39146.

10.1038/s41598-025-26881-641203898PMC12594876
3

Kim, H. K., Kang, M. S., Park, S. W., Choi, J. Y. and Yang, H. J. (2009), Auto-calibration for the SWAT Model Hydrological Parameters Using Multi-objective Optimization Method, Journal of The Korean Society of Agricultural Engineers, Vol. 51, No. 1, pp. 1~9.

10.5389/KSAE.2009.51.1.001
4

Kim, J. H. and Oh, D. K. (2004), Analysis of Soil Erosion Hazard Zone by R Factor Frequency, Journal of the Korean Association of Geographic Information Studies, Vol. 7, No. 2, pp. 47~56. (in Korean)

5

Kim, J. S., Kim, M. S., Oh, H. J. and Kim, J. K. (2020), Spatial data of Soil erosion in Korea, GEO DATA, Vol. 2, No. 1, pp. 7~12. (in Korean)

10.22761/329/DJ2020.01.01.002
6

Kim, J. S. and Kim, Y. H. (2021, April 27), “기후변화가 바꾼 우리나라 사계절과 24절기![Press Release]”, Korea Meteorological Administration. (in Korean)

7

Kim, M. K., Hur, S. O., Kwon, S. I., Jung, G. B., Sonn, Y. K., Ha, S. K. and Lee, D. B. (2010), Prediction of Soil Erosion from Agricultural Uplands under Precipitation Change Scenarios, Korean Journal of Soil Science and Fertilizer, Vol. 43, No. 6, pp. 789~792. (in Korean)

8

Kim, S. W., Lee, D. E., Jung, S. H. and Lee, G. H. (2020), Assessment of Soil Erosion and Sedimentation in Cheoncheon Basin Considering Hourly Rainfall, Journal of the Korean Geo-Environmental Society, Vol. 21, No. 4, pp. 5~17. (in Korean)

9

Kumarasamy, K. and Belmont, P. (2018), Calibration parameter selection and watershed hydrology model evaluation in time and frequency domains, Water, Vol. 10, No. 6, pp. 710.

10.3390/w10060710
10

Lee, G. H., Yu, W. S., Jang, C. L. and Jung, K. S. (2010), Analysis on Spatiotemporal Variability of Erosion and Deposition Using a Distributed Hydrologic Model, Journal of Korea Water Resources Association. Vol. 43, No. 11, pp. 995~1009. (in Korean)

10.3741/JKWRA.2010.43.11.995
11

Moriasi, D. N., Gitau, M. W., Pai, N. and Daggupati, P. (2015), Hydrologic and water quality models: Performance measures and evaluation criteria, Transactions of the ASABE, Vol. 58, No. 6, pp. 1763~1785.

10.13031/trans.58.10715
12

Pfeiffer, A. M., Collins, B. D., Anderson, S. W., Montgomery, D. R. and Istanbulluoglu, E. (2019), River bed elevation variability reflects sediment supply, rather than peak flows, in the uplands of Washington State, Water Resources Research, Vol. 55, No. 8, pp. 6795~6810.

10.1029/2019WR025394
13

Sun, J., Lu, P., Cao, Y., Zhang, N., Wu, F. and Li, P. (2022), Effects of different crop root systems on soil detachment by concentrated flow on the loess plateau in China, Water, Vol. 14, No. 5, pp. 772.

10.3390/w14050772
14

Toy, T. J., Foster, G. R. and Renard, K. G. (2002), Soil erosion: processes, prediction, measurement, and control, John Wiley & Sons.

15

Wohl, E., Bledsoe, B. P., Jacobson, R. B., Poff, N. L., Rathburn, S. L., Walters, D. M. and Wilcox, A. C. (2015), The natural sediment regime in rivers: Broadening the foundation for ecosystem management, BioScience, Vol. 65, No. 4, pp. 358~371.

10.1093/biosci/biv002
16

Yang, C. T. (1973), Incipient motion and sediment transport, Journal of the Hydraulics Division, ASCE, Vol. 99, No. 10, pp. 1679~1704.

10.1061/JYCEAJ.0003766
17

Yeon, M. H., Lee, G. H. and Woo, D. K. (2025), Development and application of the soil organic carbon model considering physical hydrological processes, Journal of Korea Water Resources Association, Vol. 58, No. 7, pp. 553~567. (in Korean)

Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 27
  • No :1
  • Pages :33-43
  • Received Date : 2025-11-27
  • Revised Date : 2025-12-16
  • Accepted Date : 2025-12-29
  • DOI :https://doi.org/10.14481/jkges.2026.27.1.33
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