Browse > Article

The Local Scour around a Slender Pile in Combined Waves and Current  

Park, Jong-Hwan (School of Civil Engineering, Chungbuk National Univ.)
Kim, Kyoung-Ho (School of Civil Engineering, Chungbuk National Univ.)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.22, no.6, 2010 , pp. 405-414 More about this Journal
Abstract
In the study, experiments are performed in the mixing region combined wave and current to investigate the characteristics of local scour around a slender pile. Wave generator and current generator are used for the experiments and currents are co-directions with the waves. The local scour depths around the pipeline are obtained according to the various pipe diameters, wave periods, wave heights, and current velocities. The experiments show that the maximum equilibrium local scour depth increases with pipe diameter, wave period, wave height, and current velocity. Using the experimental results, the correlations of scour depth and parameters such as Shields parameter ($\theta$), Froude number (Fr), Keulegan-Carpenter number (KC), Ursell number ($U_R$), modified Ursell number ($U_{RP}$) and ratio of velocities ($U_c/U_c+U_m$) are analyzed. In the mixing region combined with waves and currents, The Froude number of single parameters is the main parameter to cause the local scour around a slender pile due to waves and current and this means that current governs the scour within any limits of the currents.
Keywords
local scour; Shields parameter ($\theta$); Froude number (Fr); Keulegan-Carpenter number (KC); Ursell number ($U_R$); modified Ursell number ($U_{RP}$);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Kobayashi, T. and Oda, K. (1994). "Experimental Study on Developing Process of Local Scour Around a Vertical Cylinder", Proc. 24th International Conference on Coastal Engineering, Kobe, Japan, 2(93), 1284-1297.
2 Laursen, E.M. and Toch. (1956). "Scour Around Bridge Piers and Abutments", Bulletin 4, Iowa Highway Research Board, State University of Iowa.
3 Melville, B.W. and Raudkivi, A.J. (1977). "Flow characteristics in local scour at bridge piers", J. Hyd. Res., 15, pp. 373-380.   DOI   ScienceOn
4 Signell, R.P., Beardsley, R.C., Graber, H.C. and Gapotondi, A. (1990). "Effect of Wave-current Interaction on Wind-driven Circulation in Narrow, Shalldow Embayment", J. Geophys. Res., 95(C6), pp. 9671-9678.   DOI
5 Smer, B.M., Christiansen, N. and Fredsoe, J. (1992b). "Time Scale of Scour Around a Vertical Pile", Proc. 2nd International Offshore and Polar Engineering Conference, San Francisco, CA, 3, 308-315.
6 Smer, B.M., Fredsoe, J. and Christiansen, N. (1992a). "Scour Around a Vertical Pile in Wave", J. Waterway, Port, Coastal and Ocean Engineering, ASCE, 117(1), 15-31.
7 Smer, B.M., Christiansen, N. and Fredsoe, J. (1993). "Influence of Cross Section on Wave Scour Around Piles", J. Waterway, Port, Coastal and Ocean Engineering, ASCE, 119(5), 477-495.   DOI   ScienceOn
8 Smer, B.M. and Fredsoe, J. (1997). "Hydrodynamics Around Cylindrical Structures", World Scientific, xviii + 530.
9 Smer B.M. and Fredsoe, J. (2001). "Scour Around Pile in Combined Waves and Current", Journal of Hydraulic Engineering, 127(5), 403-411.   DOI   ScienceOn
10 Breusers, H.N.C. and Raudkivi, A.J. (1991). "Scouring", A.A. Balkema, Rotterdam, viii+143p.
11 Cevik, E. and Yksel, Y. (1999). "Scour under Submarine Pipelines in Waves in Shoaling Conditions", Journal of Waterway, Port Coastal and Ocean Engineering, 125(1), 9-19.   DOI   ScienceOn
12 Ettema, R., Melville, B.W. and Barkdoll. B. (1998). "Scale Effects In Pier-scour ex-periments", J. Hydr. Engrg., ASCE, 124(6), 639-642.   DOI   ScienceOn
13 Grant, W.D. and Madsen, O.S. (1979). "Combined Wave and Current Interaction with a Rough Bottom", Journal of Geophysical Research, 84(C4), 1797-1808.   DOI
14 Breusers, H.N.C., Nicollet, G. and Shen, H.W. (1977). "Local Scour Around Cylindrical Piers", Journal of Hydraulic Research, 15, 211-252.   DOI   ScienceOn
15 Hjorth, P. (1975). "Studies on the Nature of Local Scour", Department of Water Resources Engineering, Bulletin, Series A, 46, Lund Institute of Technology, University of Lund. Sweden.
16 Jonsson, I.G. (1966). "Wave Boundary Layer and Friction Factors", In: Proc. 10th Conf. Coastal Eng., Tokyo, 127-148.
17 김경호, 이호진, 김완식 (2008). "파랑과 정상흐름의 공존역에서 해저관로 주변의 국부세굴", 한국해안.해양공공학회논문집, 20(5), 510-521.   과학기술학회마을
18 조해용 (2009). "파랑에 의한 해저 파일 주위에서의 국부세굴", 충북대학교 대학원 석사학위논문.