Pelorus Sound is typical of New Zealand coastal locations, i.e. there is a semi-diurnal tide modulated on a spring-neap cycle, generated by the superposition of M2 (lunar, semi-diurnal) and S2 (solar, semi-diurnal) tidal constituents. Other tidal constituents, notably N2 (semi-diurnal, generated by the ellipticity of the moon’s orbit), introduce further modulation, meaning that the spring-neap cycle is not exactly repeated. The tidal range varies between at neap and at spring. (These values are calculated from a sea level time series, July 1997 – February 1998, at Pelorus Sound entrance.) The propagation of this tidal signal into Pelorus Sound has not been well
What Happened to Goodbye familiar and inspiring to you". Other critics have described the book as "A tale of self-identity" and as a novel that addresses "how important our identities are" Another important theme in the novel is family relationships. In one review, Pamela Kramer from the Examiner noted that "what the reader learns through Mclean is the importance of family". A reviewer from Galley Smith added that the novel has "many common themes relating to children of divorce and family dynamics". Another important theme in What Happened to Goodbye is friendship. One reviewer stated that "working together on an intricate model of the