DOI QR코드

DOI QR Code

An Experimental Study on the Sediment Transport Characteristics Through Vertical Lift Gate

연직수문의 퇴적토 배출특성에 관한 실험적 연구

  • 이지행 (상지대학교 일반대학원) ;
  • 최흥식 (상지대학교 건설시스템공학과)
  • Received : 2018.12.10
  • Accepted : 2018.12.24
  • Published : 2018.12.31

Abstract

In order to analyze sediment transport characteristics of knickpoint migration, sediment transport length, and sediment transport weight through the under-flow type vertical lift gate, the hydraulic model experiment and dimensional analysis were performed. The correlations between Froude number and sediment transport characteristics were schematized. The multiple regression formulae for sediment transport characteristics with non-dimensional parameters were suggested. The determination coefficients of multiple regression equations appeared high as 0.618 for knickpoint migration, 0.632 for sediment transport length, and 0.866 for sediment transport weight. In order to evaluate the applicability of the developed hydraulic characteristic equations, 95% prediction interval analysis was conducted on the measured and the calculated by multiple regression equations, and it was determined that NSE (Nash-Sutcliffe Efficiency), RMSE (root mean square), and MAPE (mean absolute percentage error) are appropriate, for the accuracy analysis related to the prediction on sediment transport characteristics of kickpoint migration, sediment transport length and weight.

하단배출 형태의 연직수문을 대상으로 퇴적토 배출특성에 따른 두부침식 거리비, 퇴적토 이동거리와 이동량을 분석하기 위해 수리 모형실험과 차원해석을 수행하였다. Froude 수와 배출특성의 상관관계를 도식화하고, 퇴적토 배출특성을 지배하는 무차원 매개변수에 의한 다중회귀식을 제안하였다. 두부침식거리, 퇴적토 이동거리와 이동량에 대한 각 다중회귀 분석식의 결정계수는 각각 0.618, 0.632, 0.866으로 높게 나타났다. 개발한 퇴적토 배출특성식의 사용성을 평가하기 위해 실제 측정값과 회귀분석식에 의해 계산된 값의 95%의 예측 신뢰구간 분석을 수행하였고, 두부침식거리, 퇴적토 이동거리와 이동량에 대한 예측의 정확도 분석차원의 NSE (Nash-Sutcliffe Efficiency), RMSE (root mean square)와 MAPE (mean absolute percentage error)는 적절한 것으로 판단되었다.

Keywords

OOSTBJ_2018_v5n4_276_f0001.png 이미지

Fig. 1. Photo of sluice gate installed in the channel.

OOSTBJ_2018_v5n4_276_f0002.png 이미지

Fig. 2. Configuration of experimental system.

OOSTBJ_2018_v5n4_276_f0003.png 이미지

Fig. 3. Sluice gate installation and the corresponding scheme of measuring points.

OOSTBJ_2018_v5n4_276_f0004.png 이미지

Fig. 4. Variation of knickpoint migration ratio (Lk/y3) against Froude number.

OOSTBJ_2018_v5n4_276_f0005.png 이미지

Fig. 5. Variation of sediment transport length ratio (Ls/y3) against Froude number.

OOSTBJ_2018_v5n4_276_f0006.png 이미지

Fig. 6. Variation of sediment transport weight ratio (Qs/y33ρ)against Froude number.

OOSTBJ_2018_v5n4_276_f0007.png 이미지

Fig. 7. Relation between sediment transport length ratio (Ls/y3) and hydraulic jump length ratio (Lj/y3).

OOSTBJ_2018_v5n4_276_f0008.png 이미지

Fig. 8. Analyses of 95% prediction interval for the calculated of sediment transport characteristics.

Table 1. Experimental conditions

OOSTBJ_2018_v5n4_276_t0001.png 이미지

Table 2. Multiple regression analysis results

OOSTBJ_2018_v5n4_276_t0002.png 이미지

Table 3. Results in the analysis of variance

OOSTBJ_2018_v5n4_276_t0003.png 이미지

Table 4. VIF values for determining the multi-collinearity of the independent variable

OOSTBJ_2018_v5n4_276_t0004.png 이미지

References

  1. Brush, L. and Wolman, M. 1960. Knickpoint behavior in noncohesive material: a laboratory study. Bulletin of the Geological Society of America, Vol. 71, pp. 59-71. https://doi.org/10.1130/0016-7606(1960)71[59:KBINMA]2.0.CO;2
  2. Cantelli, A., Paola, C. and Parker, G. 2004. Experiments on upstream‐migrating erosional narrowing and widening of an incisional channel caused by dam removal. Water Resources Research, Vol. 40, No. 3.
  3. Chang, H.H., Harrison, H.H., Lee, W., and Tu, S. 1996. Numerical modeling for sediment-pass-through reservoirs. Journal of Hydraulic Engineering, American Society of Civil Engineers, Vol. 122, No. 7, pp. 381-388. https://doi.org/10.1061/(ASCE)0733-9429(1996)122:7(381)
  4. Ham, H. B. 2007. Data Analysis and SAS Programming, Vol. 328. (in Korean)
  5. Jang, C.L. 2012. 2-Dimensional numerical simulation of the behaviors of knickpoint in the channel with noncohesive materials. Journal of Korean Society of Hazard Mitigation, Vol. 12, No. 6, pp. 259-265. (in Korean) https://doi.org/10.9798/KOSHAM.2012.12.6.259
  6. Jang, C.L. and Kim, G.J. 2017. Numerical simulation of sediment pass-through from Gongju weir. KSCE 2017 convention, pp. 105-106. (in Korean)
  7. Jang, C.L., Im, G.S. and Hwang, M.H. 2011. Technology of flushing sediment for sedimentation reduction in reservoir. Magazine of Korea Water Resources Association, Vol. 44. No. 11, pp. 45-49. (in Korean)
  8. Jeong, S.I. and Lee, S.O. 2016. Experimental study for flushing of sediment bypass pipe underneath rubber weir. Journal of the Korean Society of Safety, Vol. 31, No. 5, pp. 133-140. (in Korean) https://doi.org/10.14346/JKOSOS.2016.31.5.133
  9. Kim, D.G. and Park, W.S. 2012. Sediment flushing analysis in a reservoir by using 3 dimensional hydrodynamic simulation. Journal of Construction and Environment Research Institute, Vol. 7, No. 7, pp. 12-22. (in Korean)
  10. Kim, J.G. 2006. The variation of flow characteristics by installing improved movable weir in a river. Master's dissertation, University of Incheon, Incheon, Republic of Korea. (in Korean)
  11. Kim, J.H. 2007. The study on the bed change simulation depend on moveable weir establishment, Kunsan National University, Kunsan, Republic of Korea. (in Korean)
  12. Lee, K.S., Jang, C.L., Son, K.I. and Hwang, M.H. 2013. Numerical analysis of the sediment pass-through from the Sangju weir and the Gumi weir by using CCHE2D. Journal of Korean Society on Water Environment, Vol. 29, No, 6, pp. 813-82.4 (in Korean)
  13. Stein, O.R. and Julien, P.Y. 1993. Criterion delineating the mode of headcut migration. Journal of hydraulic engineering, Vol. 119, No. 1, pp. 37-50. https://doi.org/10.1061/(ASCE)0733-9429(1993)119:1(37)
  14. Vasquez, J.A., Millar, R.G. and Steffler, P.M. 2005. Two-dimensional morphological simulation in transcritical flow. In Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM. pp. 253-258.