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Original Article

One-Dimensional Bed Change Prediction using Sediment Discharge Estimation under Ungauged Boundary Conditions

미계측 경계 조건에서의 유사량 추정 기반 1차원 하상 변동 분석

Eun-kyung Jang1*
,
Woochul Kang2
장 은경1*
,
강 우철2
1Research Specialist, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
2Assistant Professor, Department of Smart Infrastructure Engineering, Kongju National University, Cheonan 31080, Korea
1한국건설기술연구원 수자원하천연구본부 전임연구원
2국립공주대학교 스마트인프라공학과 조교수
*Corresponding Author
31 December 2024. pp. 203-210
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Abstract

In this study, a one-dimensional bed change model was analyzed for the downstream section of the Gamcheon, and the sediment discharge was estimated under unmeasured boundary stations address at the upstream point, Jipum-gyo, the estimation methodology of Jang et al. (2023) was applied to calculate missing observations. In addition, the sediment discharge was compared with that of the Gimcheon-gyo, an observation station in the Gamcheon. Using the two sediment data, one-dimensional bed change modeling was applied. The results of bed change analysis based on the sediment discharge showed a relatively large difference between the estimated and observed values in the upstream section. However, the two results gradually aligned as observations were made downstream. This proves that accurate sediment discharge data should be acquired when analyzing bed changes in boundary conditions. Furthermore, these results showed that the estimated sediment discharge data under unmeasured boundary conditions can be sufficiently utilized in bed change modeling.

Keywords
Bed change
Gamcheon
One-dimensional numerical model
Sediment discharge estimation
Ungauged boundary conditions

본 연구에서는 감천 유역 하류 구간을 대상으로 1차원 하상 변동 모델을 구축하고, 미계측 경계 조건에서의 유사량 추정하여 이를 기반으로 한 하상 변동 분석을 수행하였다. 상류 지점인 지품교에서 관측된 유사량 데이터가 부재한 문제를 해결하기 위해 Jang et al. (2023)의 유사량 추정 방법론을 적용하여 미계측 지점의 유사량을 추정하였으며, 이를 유입 유사량으로 활용하였다. 또한 유역 내 유사량 관측소인 김천교 지점의 유사량과 비교하고, 두 유사량 데이터를 활용하여 1차원 하상 변동 모델링을 수행하였다. 추정된 유사량을 바탕으로 한 하상 변동 분석 결과, 상류 구간에서는 추정값과 관측값 간의 차이가 비교적 컸으나, 하류로 갈수록 점차 두 결과가 유사한 경향을 보였다. 이를 통해 하상 변동 분석시 경계조건에서 정확한 유사량 값이 활용되어야 함을 입증하였다. 또한 이러한 결과는 미계측 경계 조건에서 추정된 유사량 데이터가 하상 변동 모델링에서 충분히 활용될 수 있음을 보여주었다.

키워드
하상 변동
감천
1차원 수치 모델
유사량 추정
미계측 경계 조건
References
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2

Jang, E.K., Ji, U., and Ahn, M., 2018. Sediment discharge assessment and stable channel analysis using Model Tree of data mining for Naesung Stream. Journal of Korea Water Resources Association 51(11): 999-1009. (in Korean)

3

Jang, E.K., Ji, U., and Yeo, W., 2023. Estimation of sediment discharge using a tree-based model. Hydrological Sciences Journal 68(11): 1513-1528.

10.1080/02626667.2023.2221790
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Kebede, M.G., Wang, L., Yang, K., Chen, D., Li, X., Zeng, T., and Hu, Z., 2020. Discharge estimates for ungauged rivers flowing over complex high-mountainous regions based solely on remote sensing-derived datasets. Remote Sensing 12(7): 1064.

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Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 11
  • No :4
  • Pages :203-210
  • Received Date : 2024-11-29
  • Revised Date : 2024-12-23
  • Accepted Date : 2024-12-23
  • DOI :https://doi.org/10.17820/eri.2024.11.4.203
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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