“…For bottom-mounted submarine pipelines, values of Morison hydrodynamic coefficients have been evaluated for different wave and current conditions based on field investigations (Grace and Zee, 1981;Lambrakos et al, 1987) and small and large scale laboratory experiments (Sarpkaya and Rajabi, 1980;Norwegian Hydrodynamic Laboratories, 1985;Cheong et al, 1987;Veritas Offshore Technology, 1988;Bryndum et al, 1983Bryndum et al, , 1992Benassai, 1993;Neill and Hinwood, 1998;Chevalier et al, 2000;Tomasicchio et al, 2007). Some authors (Sarpkaya, 1981;Bearman et al, 1984;Sarpkaya and Wilson, 1984;Chaplin and Subbiah, 1997;Sarpkaya, 2001) proposed, for limited KC and Re ranges, additional terms in the basic Morison equations in order to minimize the differences between the experimental and the simulated forces.…”