Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Applicability Test of STPS for HEC-RAS-based Turbidity Prediction Model in the Nagdonggang

HEC-RAS에 기반한 탁도예측모형 STPS의 낙동강에 대한 적용성 검토

  • Lee, Namjoo (Dept. of Civil Eng., Kyungsung Univ.) ;
  • Choi, Seohye (R&D Division, Korea Institute of Hydrological Survey) ;
  • Kim, Chang-Sung (R&D Division, Korea Institute of Hydrological Survey)
  • 이남주 (경성대학교 건설환경공학부) ;
  • 최서혜 (한국수자원조사기술원 연구사업실) ;
  • 김창성 (한국수자원조사기술원 연구사업실)
  • Received : 2021.11.24
  • Accepted : 2021.12.16
  • Published : 2021.12.31
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Abstract

A turbidity current in a river and a lake occurs due to diverse nutrient loading including suspended sediment in sediment runoff, which affects water withdrawal and river environments. We developed one dimensional time-variant numerical model based on Python for the Nagdonggang mainstream. We examined the numerical stability and the applicability of the model by performing the simulation of quasi-steady flow in non-flooding for three cases, which are different according to the point and the amount of turbidity inflows in the Nagdonggang upstream and a tributary. The result was reasonable in the respect of the conservation of matter. The model will facilitate to simulate a large river if we can secure the data of turbidity variations in a target river reach or measured points in a field.

하천이나 호소에서 발생하는 탁도 흐름은 유역유사유출 과정에서 부유사와 같이 다양한 영양물질이 혼합된 물질 순환의 결과물로 취수나 하천환경 등에 영향을 미치는 원인이 된다. 본 연구는 낙동강 본류를 대상으로 일차원 비정상(time-variant) 수치모형의 Python 코드를 개발하였다. 개발모형의 수치 안정성을 검토하였으며 모형의 적용성을 시험하기 위해 비홍수기의 준정상류 흐름에 대하여 낙동강 본류의 상류 탁도와 지류의 탁도 변화가 반영된 3가지 모의조건으로 적용하였다. 적용 결과, 각 모의 조건에 대해 물질 보존 관점에서 합리적인 수치해석 결과를 얻을 수 있었으며 향후 현장에서 실측된 지점 또는 하도 구간 내의 탁도 유동 자료을 확보할 수 있다면 대하천에 적용 가능한 탁도 간략 예측모형으로 활용할 수 있을 것이다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원 지원으로 수행되었음 (과제번호 21DPIW-C153746-03).

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