Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Characteristics of sediment transportation and sediment budget in Nakdong River under weir operations

보 운영에 따른 낙동강 유사이송특성 및 유사수지 분석

  • Son, Kwang Ik (Department of Civil Engineering, Yeungnam University) ;
  • Jang, Chang-Lae (Department of Civil Engineering, Korea National University of Transportation)
  • 손광익 (영남대학교 공과대학 건설시스템공학과) ;
  • 장창래 (한국교통대학교 공과대학 토목공학전공)
  • Received : 2017.06.13
  • Accepted : 2017.07.10
  • Published : 2017.09.30
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Abstract

Hydraulic characteristics affecting sediment transport capacity due to the weir operations were investigated and developed sediment rating curves for four gaging stations (Nakdong, Gumi, Waegwan, and Jindong) in Nakdong River. Analysis found that the sediment transportaion capability had been decreased and it could be proved from the field measurement records in 2013. Applicabilities of nine sediment transport prediction techniques, which are imbeded in GUIDE program, were examined and adopted for the four gaging stations. Analysis of sediment balance for Nakdong River, including 9 major tributaries, had been carried out with pseudo 2-D numerical model and found that: 1) sedimentation phenomena will be prevailed along the Nakdong River. 2) Engelund-Hansen technique shows the least error in estimation of sediment balance. 3) Engelund-Hansen technique most appropriately describes the sediment characteristics for four gaging stations. 4) Estimated error from the sediment balance for Nakdong River was smaller than the error caused by the estimation of sediment incomming from 9 tributries. Therefore, it is necessary to improve the accuracy of predicting the sediment incomming from the tributaties for better sediment balance analysis.

본 연구에서는 낙동강에서 보운영에 의한 유사이송능력에 영향을 주는 수리학적 특성변화를 분석하고, 낙동강 주요 4개 지점(낙동, 구미, 왜관, 진동)의 유량-유사량 실측값을 분석하여, 각 지점별 지수형 유량-유사량 관계식을 유도하였다. 모든 지점에서 유사이송능은 감소할 것으로 예측되었으며 실제로 4대강 사업 이후인 2013년도 실측결과 사업 이전에 비해 유사이송 능력이 확연히 감소된 것을 확인하였다. GUIDE 프로그램에서 제공하는 9개 범용 유사이송능 산정기법의 적용성을 검토하여 4개 지점별로 적용 가능한 기법을 선정, 제시하였다. 주요 9개 지류를 포함한 낙동강 전 구간에 대한 유사수지분석 결과 전체적으로 퇴적이 우세한 것으로 나타났다. 유사이송능 산정기법으로는 Engelund-Hansen 공식이 가장 작은 오차를 보였으며 이는 4개 지점별 유사이송능 산정기법 적용성 검토 결과와도 일치한다. 한편 유사수지분석이 내포하는 오차가 낙동강 9개 지류로부터 유입되는 유사량 오차보다 더 작게 나타나 낙동강의 경우 지류의 유입유사량 산정기법에 대한 정밀도 향상이 시급한 과제임을 확인하였다.

Keywords

References

  1. Ackers, P., and White, W. R. (1973). "Sediment transport: new approach and analysis." Journal of the Hydraulics Division, ASCE, Vol. 99, No. HY11, Proceeding Paper 10167, pp. 2041-2060.
  2. Colby, B. R., and Hembree, C. H. (1955). "Computation of total sediment discharge Niobrara river near cody, Nebraska." Water Supply Paper 1357, U.S. Geological Survey, Washington, D.C.
  3. Einstein, H. A. (1950). The bed load function for sediment transportation in open channel flows. U.S. Department of Agriculture Soil Conservation Service Technical Bulletin, No. 1026.
  4. Engelund, F., and Hansen, E. (1972). A monograph on sediment transport in alluvial streams. Teknisk Forlag, Copenhagen.
  5. Fryirs, K. (2013). "Connectivity in catchment sediment cascades: a fresh look at the sediment delivery problem." Earth Surface Processes and Landforms, Vol. 38, pp. 30-46. https://doi.org/10.1002/esp.3242
  6. Fryirs, K. A., Brierley, G. J., Preston, N. J., and Kasai, M. (2007). "Buffers, barriers and blankets: the connectivity of catchmentscale sediment cascades." Catena, Vol. 70, No. 1, pp. 49-67. https://doi.org/10.1016/j.catena.2006.07.007
  7. Heckmann, T., and Schwanghart, W. (2013). "Geomorphic coupling and sediment connectivity in an alpine catchment - exploring sediment cascades using graph theory." Geomorphology, Vol. 182, pp. 89-103. https://doi.org/10.1016/j.geomorph.2012.10.033
  8. Jain, V., and Tandon, S. (2010). "Conceptual assessment of connectivity and its application to the Ganga river dispersal system." Geomorphology, Vol. 118, No. 3, pp. 349-358. https://doi.org/10.1016/j.geomorph.2010.02.002
  9. KSAE (1988). "Regression analysis between specific sediments of reservoirs and physiographic factors of watersheds" Journal of The Korean Society of Agricultural Engineers, Vol. 30, No. 4, pp. 45-61.
  10. MLCTa (2012). River basin surveys, Ministry of Land, Infrastructure and Transportation.
  11. MOLITa (2006-2014). Hydrological annual report in Korea, Ministry of Land, Infrastructure and Transportation.
  12. MOLITb (2013). Basic river plans for Nakdong River, Ministry of Land, Infrastructure and Transportation.
  13. MOLITc (2013). Sediment management planning for river stabilization, Ministry of Land, Infrastructure and Transportation.
  14. Ranga Raju, K. G., Garde, R. J., and Bhardwaj, R. C. (1981). "Total load transport in alluvial channels." Journal of the Hydraulics Division, ASCE, Vol. 107, No. HY2.
  15. Shao, W., Shi, C., Fan, X., Zhou, Y., and Bai, J. (2015). "Sediment budgets for a sediment-laden river: the lower Wei River in the period 1960-1990." Earth Surface Processes and Landforms, Vol. 40, pp. 414-426. https://doi.org/10.1002/esp.3647
  16. Shen, H. W., and Hung, C. S. (1972). "An engineering approach to total bed material load by regression analysis." Proceedings of the Sedimentation Symposium, Chap. 14, pp. 14-1-14-17
  17. Slaymaker, O. (2003). "The sediment budget as conceptual framework and management tool." Hydrobiologia, Vol. 494, pp. 71-82. https://doi.org/10.1023/A:1025437509525
  18. Son, K., and Ji, U. (2015). "Natural and artificial bed change analysis through sediment budget analysis of Nakdong River channel (before the four river restoration project)." Journal of Korea Water Resources Association, Vol. 48, No. 1, pp. 1-8 (in Korean). https://doi.org/10.3741/JKWRA.2015.48.1.1
  19. Van Rijn, L. C. (1984). "Sediment transport, part II, suspended load transport." Journal of the Hydraulics Division, ASCE, Vol. 110, pp. 1613-1641. https://doi.org/10.1061/(ASCE)0733-9429(1984)110:11(1613)
  20. Yang, C. T., and Francisco, J. M. (2002). User's manual for GSTARS3, U.S. Department of Interior, Bureau of Reclamation Technical Service Center.
  21. Yang, C. T. (1973). "Incipient motion and sediment transport." Journal of the Hydraulics Division, ASCE, Vol. 99, No. HY10, Proceeding Paper 10067, pp.1679-1704.
  22. Yang, C. T. (1979). "Unit stream power equation for total load." Journal of the Hydrology, Vol. 40, pp.123-138. https://doi.org/10.1016/0022-1694(79)90092-1