All Issue

2020 Vol.7, Issue 4 Preview Page

Original Article

Analysis of Bed Changes of the Nakdong River with Opening the Weir Gate

낙동강 보 개방에 따른 하상변동 분석

Seong-Jun Kim1
,
Chang-Sung Kim2*
김 성준1
,
김 창성2*
1Researcher, R&D Division, Korea Institute of Hydrological Survey, Goyang 10390, Korea
2Senior Researcher, R&D Division, Korea Institute of Hydrological Survey, Goyang 10390, Korea
1한국수자원조사기술원 연구개발실 전임연구원
2한국수자원조사기술원 연구개발실 선임연구원
*Corresponding Author
31 December 2020. pp. 353-365
PDF XML Citation
Abstract

In this study, the characteristics of bed elevation changes of the Nakdong River when weir gates are opened were analyzed using the Hydrologic Engineering Center-River Analysis System (HEC-RAS). The study area was 292.37 km downstream of the Gudam Bridge to the Nakdong estuary of the Nakdong River. The HEC-RAS program, which is a 1D numerical analysis model, was used to simulate bed elevation changes. Simulations were conducted under two scenarios from 2017 to 2019. Scenarios 1 and 2 were devised under the conditions of a fully opened gate and during gate installation, respectively. Results confirmed that, under the conditions of Scenario 1, deposition occurred in most sections from the Hapcheon-Changnyeong weir to the Changnyeong-Haman weir (a distance of approximately 40 km). In addition, it was predicted that the flow that included sediments in the main stream of the Nakdong River was not interrupted by the weir structure and regularly produced changes in the river bed.

Keywords
Bed changes
HEC-RAS
Nakdong River
Sedimentation
Weir gate

본 연구에서는 낙동강을 대상으로 HEC-RAS를 이용하여 보 개방에 따른 하상변동 특성을 분석하였다. 연구 대상 지역은 낙동강 구담교 하류부터 하구둑까지 292.37 km 구간이다. 하상변동 모의를 위하여 1차원 수치해석모델인 HEC-RAS 프로그램을 사용하였으며 2017년도부터 2019년도까지 2가지의 시나리오로 모의를 수행하였다. 시나리오 1은 수문 전면 개방의 조건으로 구축하였으며 시나리오 2는 수문이 설치된 조건으로 모의를 수행하였다. 모의결과, 시나리오 1의 조건에서 합천창녕보 - 창녕함안보 대부분의 구간 (약 40 km)에서 퇴적이 발생한 것을 확인하였다. 또한 낙동강 본류 내의 유사를 포함한 흐름이 보 구조물로 인해 단절되지 않고 연속적으로 하상을 변동시키는 것으로 예측되었다.

키워드
하상변동
HEC-RAS
낙동강
퇴적
수문
References
1
Ackers, P. and White, W.R. 1973. Sediment transport: new approach and analysis. Journal of the Hydraulics Division, 99 (hy11).
2
Ahn, J. and Lyu, S. 2013. Analysis of flow and bed change on hydraulic structure using CCHE2D: Focusing on Changnyong-Haman. Journal of Korea Water Resources Association 46(7): 707-717. (in Korean) 10.3741/JKWRA.2013.46.7.707
3
Ahn, J., Kwak, S., and Lyu, S. 2015. Analysis of the effect of dredging and weirs on bed change in the Nakdong River and its tributary using HEC-6. Journal of Korea Water Resources Association 48(9): 743-756. (in Korean) 10.3741/JKWRA.2015.48.9.743
4
BAI. 2018. Report of audit on the status of the four major rivers restoration project and the performance analysis, The Board of Audit and Inspection of Korea, Seoul, Korea.
5
Engelund, F. and Hansen, E. 1967. A monograph on sediment transport in alluvial streams, Teknisk Vorlang, Copenhagen.
6
Jeong, W.J., Ji, U., and Yeo, W.K. 2010. Sensitivity analysis of bed changes for different sediment transport formulas using the HEC-6 Model - The Lower Nakdong River. Journal of the Environmental Sciences 19(10): 1219-1227. (in Korean) 10.5322/JES.2010.19.10.1219
7
Jeong, A. and Jung, K. 2015. Analysis of long-term riverbed-level and flood stage variation due to water gate operation of multifunctional weirs at geum river. Journal of Korea Water Resources Association 48(5): 379-391. (in Korean) 10.3741/JKWRA.2015.48.5.379
8
Ji, U., Julien, P.Y., Park, S., and Kim, B. 2008. Numerical modeling for sedimentation characteristics of the Lower Nakdong River and sediment dredging effects at the Nakdong River Estuary Barrage. Journal of the Korean Society of Civil Engineers 28(4): 405-411. (in Korean)
9
Ji, U., Jang, E.K., and Kim, W. 2015. Long-term bed change analysis and equilibrium bed elevation prediction after weir construction in Nakdong River. Journal of the Korea Academia-Industrial 16(10): 7089-7097. (in Korean) 10.5762/KAIS.2015.16.10.7089
10
Laursen, E.M. 1958. Total sediment load of streams. Journal of Hydraulics Division, American Society of Civil Engineers 84(HY1): 1-36.
11
Meyer-Peter, E. and Müller, R. 1948. Formulas for bed-load transport. In IAHSR 2nd meeting, Stockholm, appendix 2, International Association for Hydro-environment engineering and Research.
12
MOE. 2020. Four Rivers Weir monitoring report with opening the gate, Ministry of Environment.
13
MOLIT. 2009. River master plan report (modified) of Nakdong river basin, Ministry of Land, Infrastructure and Transport.
14
MOLIT. 2013. River master plan report (modified) of Nakdong river basin, Ministry of Land, Infrastructure and Transport.
15
Toffaleti, F.B. 1969. Definitive computations of sand discharge in rivers. Journal of the Hydraulics Division, ASCE 95(1): 1831-1842.
16
USACE. 2016. HEC-RAS river analysis system user's manual, US Army Corps of Engineers.
17
WAMIS, Water Resources Management Information System, http://www.wamis.go.kr
18
Wilcock, P.R. 2001. Toward a practical method for estimating sediment-transport rates in gravel bed rivers. Earth Surface Processes and Landforms 26: 1395-1408. 10.1002/esp.301
19
Woo, H. and Yu, K. 1991. Discussion on test of selected sediment transport formulas. Journal of Hydraulic Engineering 117(9): 1233-1234. 10.1061/(ASCE)0733-9429(1991)117:9(1233.2)
20
Yang, C.T. 1979, Unit stream power equation for total load. Journal of the Hydraulics Division, ASCE 40: 123-138. 10.1016/0022-1694(79)90092-1
21
Yang, C.T. 2003, Sediment transport theory and practice, Krieger, Malabar, Florida.
Information
  • Publisher :Korean Society of Ecology and Infrastructure Engineering
  • Publisher(Ko) :응용생태공학회
  • Journal Title :Ecology and Resilient Infrastructure
  • Journal Title(Ko) :응용생태공학회 논문집
  • Volume : 7
  • No :4
  • Pages :353-365
  • Received Date : 2020-12-09
  • Revised Date : 2020-12-14
  • Accepted Date : 2020-12-14
  • DOI :https://doi.org/10.17820/eri.2020.7.4.353
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
  • NRF
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close