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Analysis of Flow Characteristics in Upstream Channel depending on Water Gate Operation of Nakdan Multi Functional Weir

수문운영에 따른 낙단보 상류하도 흐름특성 해석

  • Moon, Sang-Chul (School of Construction Engineering, Kyungil University) ;
  • Park, Ki Bum (School of Construction Engineering, Kyungil University) ;
  • Ahn, Seung-Seop (School of Construction Engineering, Kyungil University)
  • Received : 2015.09.09
  • Accepted : 2016.04.04
  • Published : 2016.04.30

Abstract

This study, examines the flow characteristics of upstream channel depending on water gate operation of Nakdan Multi-fuctional weir. The specific purpose of this study are to simulate the variation of flow velocity depending on the operation of the weir using 1-dimensional hydraulic model, HEC-RAS, and compare it with observed velocity. For discharge conditions from $50m^3/s$ to $3,500m^3/s$, it is observed that the velocity of upstream channel is almost constant, whereas for probability flood discharge, the velocity and froude number are increased as the discharge values are increased. The velocity values for downstream boundary condition EL, 40.0 m are more decreased than those for EL. 40.5m. From comparison on the variation of water stage depending on water gate operation, it is observed that the stage values are almost constant for discharges below $300m^3/s$, whereas 5 cm to 20 cm for discharges over $700m^3/s$. Flow velocity at streamflow gauging station. Nakdong, is decreased by more than 875% after installing the weir. The results obtained from this study indicate that the velocity of upstream channel is decreased and the discharge and velocity of downstream channel are significantly varied after installing the weir.

Keywords

Nakdan multi-fuctional weir;Hydraulic characteristics;Gate operation

References

  1. Kim, D. W., 2010, Investigation of hydraulic property around Nak-Dan diversion weir through numerical analysis and hydraulic model test, Master Thesis, Dong-A University, Korea.
  2. Kim, S. J., 2010, Analysis of effect of the flood control in the Nakdong Rivers restoration project, Master Thesis, Sungkyunkwan University, Korea.
  3. Kim, M. J., 2012, Operation of weir in Nakdong River during the flood period, Master Thesis, Sungkyunkwan University, Korea.
  4. Zhang, X., 2010, Analysis of river bed change caused by river cross structure, Master Thesis, Yeungnam University, Korea.
  5. Lee, G. Y., 2012, Investigation of hydraulic properties around Han River through numerical analysis & hydraulic model test, Master Thesis, Dong-A University, Korea.
  6. Ahn, J. M., Im, T. H., Lee, I. J., Lee, K. L., Jung, K. Y., Lee, J. W., Cheon, S. U., Park, I. H., 2014, A Study on efficiency of water supply through conjunctive operation of reservoir and multifunction weirs in the Nakdong River, Journal of Korean Society on Water Environment, 30(2), 138-147. https://doi.org/10.15681/KSWE.2014.30.2.138
  7. Na, E. H., Min, J. H., Shin, C. M., Chung, E. Kim, K. H., Song, Y. S., Cho, J. G., 2013, A 3-D hydrodynamic modeling study for the river system controlled by multi-purpose weirs, Conference of Korean Society of Water & Wastewater, 381-382.
  8. Han, E. J., Baek, K. O., Park, J. H., Jo, J. A., Kim, Y. D., 2013, A Study on fishway characteristics of multi-functional weir using numerical model, Conference of Korean Society of Water & waste-water, 9-10.
  9. www.wamis.go.kr, Water Resources Management Information System.