Water Science and Engineering 2020, 13(2) 154-161 DOI:   https://doi.org/10.1016/j.wse.2020.06.003  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Submarine pipe
Scour hole
Transient wave
Flume experiment
Live-bed condition
Sediment 
Authors
PubMed

Scour around submarine pipes due to high-amplitude transient waves

Hassan Vosoughi, Hooman Hajikandi*

Department of Civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran 1469669191, Iran

Abstract

Estimation of scour dimensions below submarine pipelines is a vital step in designing offshore infrastructure. Extreme events like tsunami waves produce strong erosive forces below the underwater pipes, apt to create scour holes, jeopardizing the safety of the structure. Despite the importance of this issue, previous studies have mainly focused on steady flow cases, and the scour pattern below submarine pipes induced by high-amplitude transient waves has rarely been investigated. This paper reports the results of 40 experimental runs on transient wave-induced scour below a model pipe in a laboratory flume under a variety of initial conditions. The variables included the bed particle size and gradation, initial water depth, wave height, and slope of the bed layer. Waves were generated by a sudden release of water from a sluice gate, installed in the middle of the flume. A pressure transducer data acquisition system was used to record the wave heights at different time steps. The results indicate that, with a shallower initial depth of flow, the scour depth is relatively large. It was also found that there exists a direct correlation between the induced wave height and the size of the scour hole. It was observed that, in clear water conditions, the size of the scour hole in coarse sediments is smaller, while in live-bed conditions, larger scour holes are created in coarser sediments. It was also observed that at high wave amplitudes, the live-bed conditions are dominant, and consequently the bed elevation is altered.

Keywords Submarine pipe   Scour hole   Transient wave   Flume experiment   Live-bed condition   Sediment   
Received 2019-06-06 Revised 2019-12-21 Online: 2020-06-30 
DOI: https://doi.org/10.1016/j.wse.2020.06.003
Fund:
Corresponding Authors: Hooman Hajikandi
Email: h_hajikandi@iauctb.ac.ir
About author:

References:

Alvisi, S., Franchini, M., 2010. Comparative analysis of two probabilistic pipe breakage models applied to a real water distribution system. Journal of Civil Engineering and Environmental Systems, 27(1), 1-22. https://doi.org/10.1080/10286600802224064.

Bearman, P.W., Zdravkovich, M.M., 1978. Flow around a circular cylinder near a plane boundary. Journal of Fluid Mechanics, 89(1), 33-47. https://doi.org/10.1017/S002211207800244X.

Brennodden, H., Lieng, J.T., Sotberg, T., Verley, R.L.P., 1989. An energy-based pipe-soil interaction model. In: Proceedings of the 21st Annual Offshore Technology Conference. Houston, pp. 147-158. https://doi.org/10.4043/6057-MS.

Breusers, H.N.C., Raudkivi, A.J., 1991. Scouring: Hydraulic Structures Design Manual. A.A. Balkema, Rotterdam.

Çevik, E., Yüksel, Y., 1999. Scour under submarine pipelines waves in shoaling conditions. Journal of Waterway Port Coastal Ocean Engineering, 125(1), 9-19. https://doi.org/10.1061/(ASCE)0733-950X(1999)125:1(9).

Chao, J.L., Hennessy, P.V., 1972. Local scour under ocean outfall pipelines. Journal of Water Pollution Control Federation, 44(7), 1443-1447. https://www.jstor.org/stable/25037552.

Chen, J.H., Su, M.C., Chen, C.Y., Lin, S.C., 2014. Developing a damage assessment model for bridge surroundings: A study of the disaster caused by Typhoon Morakot in Taiwan. Journal of Civil Engineering and Environmental Systems, 31(1), 24-35.  https://doi.org/10.1080/10286608.2013.820278.

Chiew, Y.M., 1990. Mechanics of local scour around submarine pipe lines. Journal of Hydraulic Engineering, 116(4), 515-529. https://doi.org/10.1061/(ASCE)0733-9429(1990)116:4(515).

Chiew, Y.M., 1991. Prediction  of  maximum  scour  depth  at  submarine  pipelines. Journal of Hydraulic Engineering, 117(4), 452-466. https://doi.org/10.1061/(ASCE)0733-9429(1991)117:4(452).

Ferrante, M., Capponi, C., Collins, R., Edwards, J., Brunone, B., Meniconi, S., 2016. Numerical transient analysis of random leakage in time and frequency domains. Journal of Civil Engineering and Environmental Systems, 33(1), 70-84. https://doi.org/10.1080/10286608.2016.1138941.  

Foda, M.A., Chang, Y.H., Law, A.W.K., 1990. Wave-induced breakout of half-buried marine pipes. Journal of Waterway Port Coastal and Ocean Engineering, 116(2), 267-286. https://doi.org/10.1061/(ASCE)0733-950X(1990)116:2(267) .

Francis, M.J., 2006. Tsunami Inundation Scour of Roadways, Bridges and Foundations: Observations and Technical Guidance from the Great Sumatra Andaman Tsunami.

Fread, D.L., 1984. A breach erosion model for earthen dams. In: Proceedings of Specialty Conference on Delineation of Landslides, Flash Flood and Debris Flow Hazards. Utah State University, Logan.

Gao, F.P., Gu, X.Y., Jeng, D.S., Teo, H.T., 2002. An experimental study for wave induced instability of pipelines: The breakout of pipelines. Applied Ocean Research Journal, 24(2), 83-90. https://doi.org/10.1016/S0141-1187(02)00012-3.

Hansen, E.A., Fredsoe, J., Ye, M., 1985. Two-dimensional Scour below Pipelines. Danish Center for Applied Mathematics and Mechanics, Technical University of Denmark, Lyngby.

Ibrahim, A., Nalluri, C., 1986. Scour prediction around marine pipelines. In: Proceedings of the 5th International Symposium on Offshore Mechanical and Arctic Engineering. Tokyo, ASME, pp. 679-684.

K?z?löz, B., Çevik, E., Yüksel, Y., 2013. Scour below submarine pipelines under irregular wave attack. Coastal Engineering Journal, 79, 1-8. https://doi.org/10.1016/j.coastaleng.2013.04.001.

K?z?löz, B., Çevik, E., Aydo?an, B., 2015. Estimation of scour around submarine pipelines with arti?cial neural network. Applied Ocean Research Journal, 51, 241-251. https://doi.org/10.1016/j.apor.2015.04.006.

Kjeldsen, S.P., Gjorsvik, O., Bringaker, K.G., Jacobsen, J., 1973. Local scour near offshore pipelines. In: Proceedings of the 2nd International Conference on Port and Ocean Engineering under Arctic Conditions (POAC). University of Iceland, Reykjavik, pp. 308-331.

Lee, J.Y., McInerney, J., Cossu, R., Leonga, Z.Q., Forrestb, A.L., 2017. Predicting scour beneath subsea pipelines from existing small free span depths under steady currents. Journal of Ocean Engineering and Science, 2(2), 61-75. https://doi.org/10.1016/j.joes.2017.03.001.

Liu, J., Tian, J., Yi, P., 2015. Impact forces of submarine landslides on offshore pipelines. Ocean Engineering Journal, 95, 116-127. https://doi.org/10.1016/j.oceaneng.2014.12.003.

Mao, Y., 1987. The Interaction between a Pipeline and Erodible Bed. Institute of Hydrodynamics and Hydraulic Engineering, Technical University of Denmark, Lyngby.

Mao, Y., 1988. Seabed scour under pipelines. In: Proceedings of the 7th International Symposium on Offshore Mechanical and Arctic Engineering. Houston, ASME, pp. 33-38.

Maza, J.A., 1987. Introduction to River Engineering. Universitá Italiana per traieri, Perugia (in Italy).

Moncada, M.A.T., Aguirre, P.J., 1999. Scour below pipeline in river crossings. Journal of Hydraulic Engineering, 125(9), 953-958. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:9(953).

Poaponsakorn, N., Meethom, P., 2012. Impact of the 2011 floods, and flood management in Thailand. In: Sawada, Y., Oum, S., eds., Economic and Welfare Impacts of Disasters in East Asia and Policy Responses (ERIA Research Project Report 2011-8). ERIA, Jakarta, pp.  247-310

Subhasish, D., Navneet, S.P., 2008. Clear water scour below underwater pipelines under steady flow. Journal of Hydraulic Engineering, 134(5), 588-599. https://doi.org/10.1061/(ASCE)0733-9429(2008)134:5(588).

Sumer, B.M., Fredsoe, J., 2002. The Mechanics of Scour in the Marine Environment. World Scienti?c, Singapore.

Synolakis, C., Liu, P., Philip, H.A., Carrier, G., Yeh, H., 1997. Tsunamigenic sea-floor deformations. American Association for the Advancement of Science, 278(5338), 598-600. https://doi.org/10.1126/science.278.5338.598.

Wagner, D.A., Murff, J.D., Brennodden, H., Sveggen, O., 1989. Pipe-soil interaction model. Journal of Waterway Port Coastal Ocean Engineering, 115(2), 205-220. https://doi.org/10.1061/(ASCE)0733-950X(1989)115:2(205).

Zeinoddini, M., Arabzadeh, H., Ezzati, M., Parke, G.A.R., 2013. Response of submarine pipelines to impacts from dropped objects: Bed flexibility effects. International Journal of Impact Engineering, 62, 129-141. https://doi.org/10.1016/j.ijimpeng.2013.06.010.

Zhang, Q., Draperb, S., Cheng, L., An, H.W., 2016. Scour below a subsea pipeline in time varying flow conditions. Applied Ocean Research Journal, 55, 151-162. https://doi.org/10.1016/j.apor.2015.10.003.

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