Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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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
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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

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

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Fig. 2. Configuration of experimental system.

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

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

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

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

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

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

Table 1. Experimental conditions

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Table 2. Multiple regression analysis results

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Table 3. Results in the analysis of variance

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

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