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Prediction and Historical Analysis of Long-term Bed Elevation Change in the Mankyung-gang River

만경강의 장기하상변동 예측 및 이력분석

Seung Ki Kim1
,
Ji Sung Kim2
,
Kyu Ho Kim2
,
Sung-Uk Choi1*
김 승기1
,
김 지성2
,
김 규호2
,
최 성욱1*
1Department of Civil and Environmental Engineering, Yonsei University
2Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology
1연세대학교 토목환경공학과
2한국건설기술연구원 수자원･하천연구소
*교신저자. *Corresponding Author. 
31 March 2018. pp. 25-34
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Abstract

This study presents prediction and historical analysis of the long-term bed elevation change in the Mankyung-gang River. The study area is a 25 km long reach including middle and lower courses of the Mankyung-gang River. HEC-RAS program was used for numerical predictions, and values of roughness coefficients were calibrated. Then, predictions were made in the two periods, seven years from 1986 to 1993 and twelve years from 1993 to 2005. Simulation results were compared with two sets of measured data for bed elevations. Four sediment transport formulas, namely MPM’s, Toffaleti’s, MPM-Toffaleti’s, and Yang’s formula, were tested. Simulation results showed that none of the four sediment transport formulas predicted the bed elevation change in the period of 1986 - 1993. This is related to the fact that dredging work was performed in the upstream reach in the period of 1986 - 1993, and sediment was deposited in this part severely later. However, it was found that MPM-Toffaleti’s formula predicted properly the bed elevation change for the period of 1993 - 2005.

Keywords
Bed elevation change
Dredging
Historical analysis
Sediment transport

본 연구에서는 만경강에서의 장기하상변동 모의를 실시하고 하상변동 이력을 분석하였다. 연구 대상 지역은 만경강의 중･하류 25 km 구간이다. 장기하상변동 모의를 위하여 HEC-RAS 프로그램을 사용하였으며 조도계수를 이용하여 모형을 보정하였다. 1986년부터 1993년까지의 기간과 1993년부터 2005년까지의 기간에 대하여 하상변동 모의를 수행하였으며, 실측된 하상고와의 비교분석을 실시하였다. MPM, Toffaleti, MPM-Toffaleti, Yang 공식의 네가지 유사이송 공식의 적용성을 평가하였다. 1986년부터 1993년까지의 기간에 대한 모의 결과, 네가지 공식 모두 실측치를 적절하게 모의하지 못하였다. 이는 모의구간 상류에서의 준설이 발생한 것으로 인한 결과이며 이후 기간에서 상류에서 퇴적이 활발이 진행되게 되는 결과를 초래하였다. 1993년 부터 2005년까지의 장기하상변동 모의는 MPM-Toffaleti의 공식이 모의를 적절히 수행해 냄을 확인하였다.

키워드
하상변동
유사 이송
준설
이력 분석
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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 : 5
  • No :1
  • Pages :25-34
  • Received Date : 2018-02-07
  • Revised Date : 2018-03-05
  • Accepted Date : 2018-03-13
  • DOI :https://doi.org/10.17820/eri.2018.5.1.025
Journal Informaiton Ecology and Resilient Infrastructure Ecology and Resilient Infrastructure
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