Figure 7
From: Classification of monthly tidal envelopes in mixed tide regimes

Power spectral density derived from 1 h interval sea level records from (a) Dokdo, Korea (August 1 2009 to May 15 2010), (b) Mokpo, Korea (2017), (c) Brisbane, Australia (2021), and (d) Colombo, Sri Lanka (2021). See Ref.21 for details of the methods used to generate the power spectra density.