Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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A Laboratory Study on Erosional Properties of the Deposit Bed of Saemankeum Sediments

새만금 점착성 퇴적물의 퇴적저면 침식특성에 관한 실험적 연구

  • Received : 2015.03.06
  • Accepted : 2015.04.08
  • Published : 2015.04.30
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Abstract

In this study, the erosional properties of deposit bed for the natural sediments are quantitatively estimated domestically for the first time using annular flume. Four erosion tests for Saemankeum sediments have been carried out on different consolidation time. Experimental results of erosional tests show that shear strength ${\tau}_s$ increases with the increases of consolidation time and bed depth. The erosion rate increases logarithmically with the increases of exceed shear strength ${\tau}_b-{\tau}_s$. But, the erosion rate decreases rapidly with the decreases of exceed shear strength under the $0.2N/m^2$. Experimental results of this study are found to be remarkably different in quantity as compared with those for results of previous study.

본 연구에서는 환형수조를 이용한 침식실험을 통하여 국내 최초로 자연시료를 이용한 퇴적저면 침식특성이 정량적으로 산정되었다. 새만금 점착성 퇴적물을 이용한 실험이 수행되었으며, 퇴적저면 형성을 위한 압밀시간을 변화시켜가며 총 4회의 침식실험이 수행되었다. 침식실험 결과에 따르면, 저면전단강도 ${\tau}_s$는 압밀시간 및 저면의 깊이가 증가함에 따라 증가하는 것으로 나타났다. 잉여전단응력 ${\tau}_b-{\tau}_s$에 따른 침식률은 로그함수 형태로 증가하는 것으로 나타났으며, $0.2N/m^2$ 이하의 잉여전단응력 구간에서는 잉여전단응력이 작아질수록 침식률이 급격하게 작아지는 경향을 보였다. 본 연구결과는 타 지역의 연구결과와 비교/분석되었으며, 그 정량적 값은 지역적으로 큰 차이를 보이는 것으로 나타났다.

Keywords

References

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