Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Review on Applicability of Local Scour Depth Calculation Formula in River

하천 세굴심 산정을 위한 교각 세굴심 산정식의 적용성 검토

  • Min, ByungYun (Bong-Hwa Water Supply Office, K-water) ;
  • Chang, HyungJoon (School of Civil Engineering, Chungbuk National University) ;
  • Lee, HoJin (School of Civil Engineering, Chungbuk National University) ;
  • Kim, SungDuk (School of Civil Engineering, Chungbuk National University)
  • Received : 2019.02.27
  • Accepted : 2019.03.20
  • Published : 2019.03.31
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Abstract

The basic analysis of Soil and structural mechanics for the bridge substructure affected by the flow of water is sufficient in the construction of such bridges, but the stability of scour resulting from hydraulic phenomena is insufficient. In addition, it is not enough to estimate the scour depth of the bridge which reflects the watershed characteristics of the domestic river because it uses the formula for calculating the scour depth of the overseas piers in calculating the scour depth of the bridge. In this study, the application of the CSU (1993) formula, which is currently applied to the national river design criteria, was reviewed between the two formulas after calculating the scour after calculating the scour by applying another bridge deck scour calculation formula to take into account the uncertainty in the calculation of scour. In this study, in addition to the CSU (1993) formula, which is currently applied to Korean river design criteria, another scour depth calculation formula is applied to calculate uncertainty in scour depth calculation, was reviewed between the two formulas. The review confirmed that the SSE (%) showed a difference of at least 2.08%, up to 91.23%, and SSEn(%) at least 0.19%, up to 415.91%, when compared to the measured depth of the pier based on the hydraulic model experiment and the depth of the pier calculated with the nine scour depth formulas in use. In other words, it is confirmed that there are many differences between the scouring formulas of piers. The results of this study are expected to be used to estimate scour depth in future river design.

교량을 건설함에 있어 물의 흐름에 영향을 받는 교량 하부 구조물에 대한 토질 및 구조역학적 기초 분석은 충분하지만 수리현상으로 발생하는 세굴의 안정성 검토는 미흡한 실정이다. 또한 교각세굴심 산정에 있어 해외 교각세굴심 산정식을 활용하고 있기에 국내 하천의 유역 특성을 반영한 교각세굴심을 정도 높게 산정하는데 미흡하다. 본 연구에서는 현재 우리나라 하천설계 기준에 적용되고 있는 CSU(1993)공식 뿐만 아니라 세굴심 산정에 있어 불확실성을 고려하기 위하여 다른 교각 세굴심 산정식을 추가로 적용하여 세굴심을 산정한 후 각각의 공식들 간에 적용성을 검토하였다. 검토 결과 기존 사용되고 있는 9개의 교각세굴심 산정식으로 산정된 교각 세굴심 깊이와 수리 모형실험을 바탕으로 측정된 세굴심과 비교하였을 경우 SSE(%)는 최소 2.08%, 최대 91.23%, SSEn(%)은 최소 0.19%, 최대 415.91%의 차이를 보이고 있음을 확인하였다. 그 결과, 교각세굴심 산정식 간에도 많은 차이가 있음을 확인하였다. 본 연구의 결과는 향후 하천설계에 있어 정도 높은 세굴심을 산정함에 활용할 수 있을 것으로 기대된다.

Keywords

HKBJBA_2019_v12n1_1_f0001.png 이미지

Fig. 1. Types of Scour in Bridges

HKBJBA_2019_v12n1_1_f0002.png 이미지

Fig. 2. Results of Calculation of scour depth using 7 experimental data

Table 1. Prediction formulas of scour depth around pier

HKBJBA_2019_v12n1_1_t0001.png 이미지

Table 2. Hydraulic experiment data

HKBJBA_2019_v12n1_1_t0002.png 이미지

Table 3. Results of Equation (1) and Equation (2)

HKBJBA_2019_v12n1_1_t0003.png 이미지

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Cited by

  1. 수리모형실험 자료를 이용한 교각 세굴심 산정공식의 통계적 특성 분석 vol.22, pp.6, 2019, https://doi.org/10.5762/kais.2021.22.6.349