Hydrodynamic Analysis of Marine Structure in the Niger Delta Region: A Case Study of a Jetty
Abstract
This project aims to calculate the hydrodynamic forces acting on a jetty column structure due to wave and current loads and subjecting the obtained results to the API design specifications to ensure that they are within acceptable range. It will also determine the variation of these forces at different depths. The project will bring about construction of stable, long lasting jetties in the Niger delta region through the effective analysis of hydrodynamic forces that will affect the structure in operation. Jetty column parameters and metocean data from NPA Portharcourt were used as case study. The analysis was done using Morrison's equation to calculate the wave and current forces acting on the column structure. The equation comprises of the drag force and inertia force which sums together to give the total force on pile. MATLAB and Statistical software were used to model the wave equations and two coordinate systems were chosen. Water particle velocity, acceleration and the forces on column were calculated in the horizontal axis. The water particle velocity and acceleration decreased with increase in depth while the drag force and inertia force increased with depth. The result of the analysis shows that the hydrodynamic forces acting on the jetty pile structure increases with increase in depth and are within acceptable stress limits. This provides an insight for engineers and designers on offshore structural installations
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Literaturhinweise
Bea, R. G., Inversen, R., & Xu, T. (2001). Wave-in-deck forces on offshore platforms. Journal of Offshore Mechanics and Arctic Engineering, 123, 10–21. https://doi.org/10.1115/1.1342160
Broughton, P., & Horn, E. (1987). Ekofisk Platform 2/4C: Re-analysis due to subsidence. Proceedings of the Institution of Civil Engineers, 1(82), 949–979. https://doi.org/10.1680/iicep.1987.488
Chakrabarti, S. K. (2005). Handbook of ocean engineering: Ocean environment, loads and responses. Oxford: Elsevier.
Cuomo, G., Tirindelli, M., & Allsop, N. W. H. (2007). Wave-in-deck loads on exposed jetties. Coastal Engineering, 54(9), 657–679. https://doi.org/10.1016/j.coastaleng.2007.07.010
Cuomo, G., Shimosaka, K., & Takahashi, S. (2009). Wave-in-deck loads on coastal bridges and the role of air. Coastal Engineering, 56(8), 793–809. https://doi.org/10.1016/j.coastaleng.2009.01.005
Giovanni, C., Matteo, T., & Willian, A. Q. (2007). Wave-in-deck loads on exposed jetties. Retrieved February 2, 2017, from http://www.elsevier.com/loads/locate/coastaleng
Gudmestad, O. T., & Moe, G. (1996). Hydrodynamic coefficients for calculation of hydrodynamic loads in offshore truss structures. Marine Structures, 9(8), 745–758.
Isaacson, M., & Bhat, S. (1994). Wave forces on a horizontal plate. In Proceedings of the International Symposium: Waves–Physical and Numerical Modelling (pp. 1184–1193). University of British Columbia, Vancouver.
Kaplan, P., Murray, J. J., & Yu, W. C. (1995). Theoretical analysis of wave impact forces on platform deck structures. In Offshore Mechanics and Arctic Engineering (OMAE), Vol. 1A (pp. 189–198). ASME.
Morison, J. R. (1953). Forces exerted by surface waves on piles. Institute of Engineering Research, University of California, Berkeley, California.
Sarpkaya, T., & Isaacson, M. (1981). Mechanics of wave forces on offshore structures. New York: Van Nostrand Reinhold.
SNAME. (2010). Wave loads: Statical, dynamic and non-linear aspects – Computation of wave-induced loads. Retrieved January 21, 2017.
Suchithra, N., & Koola, P. M. (1995). A study of wave impact on horizontal slabs. Ocean Engineering, 22(7), 687–697. https://doi.org/10.1016/0029-
