Fig. 4

Assumed spectral shape, log scale (left) and linear (right) for \(\sigma = 0.1\) m/s and \(\varepsilon = 0.47\frac{{\sigma^{3} }}{L}\) with L = 25 m (f_K = 1, N = 0.0121 s⁻¹). These values can be changed and spectral shape replotted using the code provided. Note how the energy is concentrated at low wavenumbers, and therefore, the spectral shape in the ISR and beyond is important. Note also the difference relative to Hocking’s spectrum (Eq. 66) in the BSR and beyond