Erratum for “Simulation of Wave-Plus-Current Scour beneath Submarine Pipelines” by Bjarke Eltard Larsen, David R. Fuhrman, and B. Mutlu Sumer

Although practical methods exist (see Fredsøe et al. 1992; Sumer and Fredsøe 2002, p. 72) for predicting the scour time scale in both pure-current as well as pure-wave conditions, this quantity has not previously been investigated and properly parameterized for generalized wave-plus-current flow environments, to the authors’ knowledge.

As a first attempt at parameterization of the wave-plus-current scour timescale, Fig. 15 shows the computed nondimensional timescales as a function of ${\theta }_{cw}$ for all cases considered in the present work. As a reference, the experimentally based relation for the timescale of Fredsøe et al. (1992)

is also shown as the full line, which was demonstrated to be valid for both pure-current as well as pure-wave scour conditions. Fig. 15 shows that both the pure-current (diamonds, m = 1) and especially the pure-wave (circles, m = 0) results match the reference line [Eq. (18)] reasonably, which is generally consistent with the experimental findings of Fredsøe et al. (1992).

Although there is inevitably some scatter in the results, this appears to be of the same order of magnitude as typically seen in experiments (see Fredsøe et al. 1992).

Importantly, this function tends to $\Gamma (m)=1/50$ for both pure-wave and pure-current flows, hence unifying existing experimentally based expressions for the timescale at these limits (Fredsøe et al. 1992).