left of the direction of the incident wave. The degree of displacement on the northern hemisphere for the first amphidrome is given by: Where γ is the displacement of the amphidrome from the centre of the channel (γ=0), g is the gravitational acceleration, D is the water depth, f is the Coriolis frequency and α is the ratio between amplitudes of the reflected wave and the incident wave. Because the reflected wave is smaller than the incident wave, α will be smaller than 1 and lnα will be negative. Hence the amphidromic displacement γ is to the left of the incident wave on the northern hemisphere. Furthermore, a study has shown than there is a pattern of amphidrome movement related to spring-neap cycles in the Irish Sea. The maximum displacement of the amphidrome from the centre coincides with spring tides, whereas the minimum occurs at neaps. During spring tides, more energy is absorbed from the tidal wave compared to neap tides. As a result, the reflection coefficient α is smaller and the displacement of the amphidromic point from the centre is larger. Similar amphidromic movement is expected in other seas where energy dissipation due to friction is high. It can occur that the amphidromic point moves inland of the coastal boundary. In this case, the amplitude and the phase of the tidal wave will still rotate around an inland point, which is called a virtual or degenerate amphidrome. Amphidromic points and sea level rise The position of amphidromic points and their movement predominantly depends on the wavelength of the tidal wave and friction. As a result of enhanced greenhouse gas emissions, the oceans in the world are becoming subject to sea-level rise. As the water depth increases, the wavelength of the tidal wave will increase. Consequently the position of the amphidromic points located at λ in semi-enclosed systems will move further away from the cross-shore coastal boundary. Furthermore, amphidromic points will move further away from each other as the interval of λ increases. This effect will be more pronounced in shallow seas and coastal regions, as the relative water depth increase due to sea-level rise will be larger, when compared to the open ocean. Moreover, the amount of sea-level rise differs per region. Some regions will be subject to a higher rate of sea-level rise than other regions and nearby amphidromic points will be more susceptible to change location. Lastly,