Abstract
Infragravity (IG) waves may cause dangerous ranging of moored ships having resonant natural frequencies of oscillation, which can be exacerbated in harbour basins having resonant IG length scales. To aid navigation the Port Kembla Port Corporation established two bottom-mounted Acoustic Doppler Current Meters (ADCPs) with pressure sensors offshore of the port entrance to monitor swell waves and currents. From long time series of high frequency surface displacement data it has been possible to elicit nearshore IG wave events along with their concomitant swell wave characteristics. Having concomitant Waverider buoy data offshore it has been possible to develop relationships between the nearshore IG wave data and the deep water swell wave characteristics based on theoretical analysis calibrated with field data. From those relationships an IG wave climate has been developed from the long term Waverider buoy data. This paper presents a methodology for and the results from developing, theoretically and empirically, an IG wave climate for the NSW coast based on field data. As Fourier transformation does not describe shallow water wave spectra correctly, an alternative method of describing shallow water IG wave spectra is presented.
| Original language | English |
|---|---|
| Pages | 1138-1143 |
| Number of pages | 6 |
| Publication status | Published - 2019 |
| Event | Australasian Coasts and Ports 2019 Conference - Hobart, Australia Duration: 10 Sept 2019 → 13 Sept 2019 |
Conference
| Conference | Australasian Coasts and Ports 2019 Conference |
|---|---|
| Country/Territory | Australia |
| City | Hobart |
| Period | 10/09/19 → 13/09/19 |