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2019 Vol.6, Issue 4 Preview Page

Original Article

Assessment of Channel Stability with Groynes

수제 설치에 의한 하도 안정성 평가

Gi Jung Kim1
,
Chang-Lae Jang2*
,
Kyung Su Lee3
김 기정1
,
장 창래2*
,
이 경수3
1PhD candidate, Department of Civil Engineering, Korea National University of Transportation, Chungju, 27469, Korea
2Professor, Department of Civil Engineering, Korea National University of Transportation, Chungju, 27469, Korea
3Research Officer, National Disaster Management Institute, Ministry of the Interior and Safety, Ulsan, 44538, Korea
1한국교통대학교 공과대학 토목공학전공 박사과정
2한국교통대학교 공과대학 토목공학전공 교수
3행정안전부 국립재난안전연구원 시설연구사
* Corresponding Author
31 December 2019. pp. 314-327
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Abstract

This study investigates channel stabilities with groynes by developing the assessment of it and applying a 2-dimensional numerical model, which simulates flow and sediment transport with various flows in the channel. Evaluation inventories are composed of five items, which are width to depth ratio, sinuosity, bed slopes, velocities in the flow flied, Shields number with discharges and geomorphic characteristics in the study reach. The channel stability is evaluated by applying the evaluation indicators to the channel with and without groynes in the study reach between Dalseong-weir and Gangjeonggoryeong-weir in the Nakdong river. Width to depth ratio, sinuosity, and bed slopes, which are index of river characteristics, little affect the channel stability. However, velocities in the flow flied, and Shields number, which is dimensionless tractive, near the banks of the channel strongly affect the stability. The evaluation values of the stability in the channel on the left and right banks decrease as the number of groynes increase in both the left and right banks, which means that the bank stability increases with the groynes.

Keywords
Assessment of channel stability
Groyne
Numerical model
Stability estimation
Shields number

본 연구에서는 본 연구에서는 2차원 수치모형을 적용하여 수제설치에 의한 흐름특성을 분석하고, 하도의 안정성을 평가할 수 있는 평가방법을 개발하였다. 2차원 수치모형의 결과는 관측자료와 1차원 모형의 결과와 비교하여, 그 적용성을 검토하였다. 평가 지표는 대상구간의 수리 및 지형학적 특성을 고려하여 하폭 대 수심의 비, 사행도, 하상경사, 하안 부근에서 유속, Shields number 등 5가지 항목으로 구성하였다. 낙동강의 달성보∼강정고령보 구간의 수제 설치 전·후에 대해 평가지표를 적용하여 하도 안정성을 평가하였다. 평가 항목 중에서 하폭 대 수심의 비, 사행도, 하상경사는 하도의 안정성에 영향을 크게 주지 않는 것으로 평가되었다. 양안 부근에서 유속과 유사의 이동 특성을 결정하는 무차원 소류력인 Shields Number는 수제에 의하여 영향을 받으며, 수제의 수가 증가할수록 평가 값은 감소하고, 하안의 안정성은 증가하였다.

키워드
수제
저수로
수치모의
안정성 평가
무차원 소류력
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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 : 6
  • No :4
  • Pages :314-327
  • Received Date : 2019-12-14
  • Revised Date : 2019-12-19
  • Accepted Date : 2019-12-23
  • DOI :https://doi.org/10.17820/eri.2019.6.4.314
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