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김경호(Kim, Kyoung Ho),김홍훈(Kim, Hong Hoon),오현식(Oh, Hyoun Sik),연주흠(Yeun, Ju Heum) 한국해안해양공학회 2005 한국해안해양공학회 논문집 Vol.17 No.2
사질성 해저바닥 위에 관로가 설치되는 경우 자가매몰 되는 경향이 있는 것은 잘 알려진 사실이다. 본 연구는 해저에 매설된 관로 주변의 국부세굴의 특성을 실험적으로 고찰한 논문이다. 관로의 매설비에 따라 국부세굴심을 측정하였다. 관이 매설된 경우의 국부세굴에서는 배후류가 세굴에 큰 영향인자로 작용하는 것으로 나타났다. 일반적으로 세굴심은 매설비가 클수록 감소하는 경향을 나타내었다. 실험결과를 이용해서 상대 세굴심과 K-C수 및 수정 Ursell수의 상관성을 알아보고 이들의 관계식도 도출하였다. 실험결과 K-C수 및 수정 Ursell수가 증가할수록 세굴영역이 확장되고 세굴심이 증가하는 것으로 나타났다. It is well-known that when pipelines are positioned on a sandy seabed, they have a tendency to bury themselves. This paper presents the results of an experimental investigation on the characteristics of the local scour around the submarine imbeded pipelines exposed to waves. Scour depths were measured according to the imbedment ratios of the pipelines. The results indicated that the effect of lee-wake of the pipe is the key element in the scour process of the submarine imbeded pipelines. In general, scour depths are smaller as the imbedment ratios are larger. Using the experimental results, the relative scour depths are related to Keulegan -Carpenter number and modified Ursell number, and the empirical equations are established. These equations show that the relative scour depths are proportional to above two parameters and the scour region is extended as Keulegan-Carpenter number and modified Ursell number are larger.
불연속 수심을 갖는 천해역에서의 장파의 변형에 대한 실험적 연구
김경호,이호진,연주흠,안상도 충북대학교 건설기술연구소 1999 建設技術論文集 Vol.18 No.2
The propagation of surface waves in the region with depth discontinuity caused by dredging for navegation channel, and reclamation etc. induces the soil troubles such as moorage's siltation and beach erosion. In this paper, at first experiments are conducted to investigate the wave deformation over rectangular pit. The effects of many parameters such as the depth ratio, shape ratio of pit, wave steepness and period on the wave deformation near the pit are investigated. Secondly, numerical analysis is performed. Wave field is divided into two regions which are the interior and the exterior region of the pit, respectively. The governing equations for the long' waves over the pit are integrated. Application of Green's second identity using the appropriate Green functions in each region leads to a pair of integral equation for the potential and its normal derivative as unknown variables in each region. The numerical experiments are conducted by solving above integral equations using the boundary element method. Finally, The measured values are compared with the computed ones. The results show that the computed values are underestimated a little, however, two values show relatively good agreements.