RESONANT OSCILLATIONS IN SMALL CRAFT HARBOURS: OBSERVATIONS AND MITIGATION MODELING EXAMPLES FROM ATLANTIC CANADA
AbstractAgitation from swells and long waves can pose serious challenges for harbours, in terms of both infrastructure design and operations. Wave gauge observations from Atlantic Canadian harbours of varying sizes were used to assess how combinations of basin dimensions and external wave forcing may lead to swell agitation, resonance, and scour problems. This paper summarizes how basin resonances were investigated with field observations, analytical methods, and then phase-resolving numerical models. The case studies illustrate how resonance mitigation may require substantial (and sometimes impractical) changes in harbour layout. Swell and scour mitigation may be more readily achieved by modifications or additions to existing structures.
Bakker, A. T. M., M. F. S. Tissier, and B. G. Ruessink. 2014. Shoreline dissipation of infragravity waves. Continental Shelf Research 72 : 73-82.
Bellotti, G., 2007. Transient response of harbours to long waves under resonance conditions. Coast. Eng. 54, 680-693.
Dong, Guohai, Junliang Gao, Yuxiang Ma, Xiaozhou Ma, and Gang Wang. 2013. Numerical study of low-frequency waves during harbour resonance. Ocean Engineering 68 : 38-46.
Gierlevsen T., Hebsgaard M., Kirkegaard J. 2001. Wave disturbance modeling in the port of Sines, Portugal - with special emphasis on long period oscillations. Int'l Conf. on Port and Maritime R&D Technology, Singapore, 2001.
Rabinovitch A.B. (2010). Seiches and Harbour Oscillations. In: Handbook of Coastal and Ocean Engineering, World Scientific, pp. 193-236.
Guerrini, Marco, Giorgio Bellotti, Yang Fan, and Leopoldo Franco. 2014. Numerical modelling of long waves amplification at marina di carrara harbour. Applied Ocean Research 48 : 322-30.
Kofoed-Hansen, H., Kerper, D.R., Sorensen, O.R., Kirkegaard, J., 2005. Simulation of long wave agitation in ports and harbours using a time-domain Boussinesq model. Proceeding of the Fifth COPRI International Conference on Ocean Wave Measurement and Analysis, WAVES, paper n. 077.
López, M., G. Iglesias, and N. Kobayashi. 2012. Long period oscillations and tidal level in the port of ferrol. Applied Ocean Research 38 : 126-34.
Sakakibara, Shigeki, and Masayoshi Kubo. 2008. Characteristics of low-frequency motions of ships moored inside ports and harbours on the basis of field observations. Marine Structures 21 (2): 196-223.
Sorensen R., Thompson E.F. (2012). Harbour Hydrodynamics. In: USACE Coastal Engineering Manual, EM 1110-2-1100 Chap. II-7.
Thotagamuwage, Darshani T., and Charitha B. Pattiaratchi. 2014. Observations of infragravity period oscillations in a small marina. Ocean Engineering 88 : 435-45.