Water for future (물과 미래)

Korea Water Resources Association (한국수자원학회)
권호 표지

Effect of Length of Outfall Structure on Reattachment of Thermal Discharge

온수방류의 귀환에 방류구 길이의 영향

  • 윤태훈 (한양대학교 토목공학과) ;
  • 육운수 (관동대학교 토목공학과) ;
  • 이용균 (한양대학교 토목공학과 대학원)
  • Published : 1994.09.01
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Abstract

The reattachment of buoyant effluent to shore in a crossflow is investigated experimentally. The effluent is produced by discharging warm water through projecting side channel into a confined cross-flow of the same depth. In the projecting effluent, the size of recirculating region, which is formed by defleted thermal plume on the lee of the effluent, tends to increase, but the maximum temperature decreases in the direction of the crossflow and it has more even transverse spreading compared to non-projecting type. The heat flux across the crossflow is found to be independant of the projected length of the side channel under relatively low buoyancy flux on the contrary to high buoyancy flux. The reattachment of the effluent can be specified by both velocity ratio and densimetric Froude number, whereas only the velocity ratio is governing factor to the reattachment of the effluent in the case of non-projecting type.

돌출방류수로에 의하여 동일한 수심의 개수로에 방류되는 부력방류에 의한 연안귀환이 수리실험에 의하여 해석되었다. 부력방류는 온수를 방류하여 발생된다. 돌출방류로 인하여 부력류 하류에 형성되는 재순환영역의 크기는 비돌출방류에서 보다 증가하는 경향을 갖으나 황온도분포는 균일하고 횡단면 최대온도는 감소를 나타낸다. 높은 부력흐름율과는 반대로 낮은 부력흐름율 조건에서 단면평균온도 또는 열흐름율은 돌출길이의 영향이 무시할 정도이다. 비돌출의 경우에는 연안귀환에 유속비가 지배적인 매개변수이었으나 돌출방류의 경우에는 유속비와 후르드수가 다같이 지배적인 인자로 나타났다.

Keywords

References

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