page 313, second line above figure 12.1: Amplitude of 1 m would be more correct than 3 m.

page 313, figure 12.1 (b): The ellipses are drawn incorrectly. The (vertical) minor axis should tend to zero for ellipses approaching the bottom. The diminishing of the (horizontal) major axis should be negligible.

On the middle of page 314:

"(5) The amplitude a of the surface is essentially independent of the"

could be replaced by

"(5) The amplitude a of the surface is in practice somewhat dependent of the "

page 316: In order to correct eq. (12.5), replace a (two places) by - a

pages 323-324, comments to figure 12.8 and to items (5) and (6) on p. 324:

It is not clear from the figure how the time interval τ is defined. Six zero crossings, three upcrossings and three downcrossings, are seen on the figure. Further let us assume that ten wave crests (local maxima) are seen.

If there are n +1 zero-upcrossings, then τ (as used for definition of the mean zero crossing period T_z = τ/n ) should be the time from the first to the last zero-upcrossing. On the figure n + 1 = 3, hence n = 2, in contrast to last line of item (5) on p. 324. Note that in practice n ought to be a large integer, say one hundred or more.

If there are m +1 wave crests, then τ (as used for definition of the mean crest period T_c = τ/m ) should be the time from the first to the last wave crest. On the figure m + 1 = 10, hence m = 9, in contrast to second line of item (6) on p. 324. Note that m can be larger, but not smaller, than n.

page 325, second line after eq. (12.46): "period, is" should be replaced by

"period, which is typically 70 to 90 % of the peak period T_p , which is".

page 325: Eq. (12.47) could be replaced by "T_e/T_z is typically 1.1 to 1.3." [Observe that the last line of eq. (12.49) should, correspondingly, be applied with some caution.]

page 325: In eq. (12.48), T_z should be replaced by T_e

pages 333-334, comments to figure 12.18 and to last sentence of subsection 12.5.4:

There is a significant difference between the Norwegian TAPCHAN wave-energy converter (WEC) and the WEC proposed for Mauritius. The TAPCHAN does not apply a fixed inclined ramp as indicated in figure 12.18, but an essentially horizontal tapered channel. It is wide towards the sea where waves enter, and it gradually narrows inwards. As the waves propagate along the narrowing channel, the wave amplitude increases. When wave crests reach above the level of the upper channel edge (e.g 4 m above sea level) water is lifted over the channel wall and into the reservoir.

JF 2002-09-24 (minor revision 2005-10-19)