Figure 5. Iceberg motion with currents.

(a) Conceptual model of the interaction between the tidal rose and geostrophic currents and how the ratio influences iceberg trajectory. Figure adapted from ref. 50. GC and TC are the geostrophic and tidal currents, respectively. (b) Synthesis model showing the key variables used to calculate tidal and geostrophic current velocities from the iceberg scours. A hypothetical tidal ellipse (TC) is displayed with the major axis orthogonal to the geostrophic current. TD is the Tidal Distance (referred to as amplitude in the text) covered by the iceberg and is used to calculate tidal velocities based on a semi-diurnal tidal period. GD is the Geostrophic Distance (referred to as wavelength in the text) used to calculate geostrophic current velocities. HT and LT represent the locations on the tidal cycle for high and low tide, respectively. STC is the semi-diurnal tidal cycle of 12 h 25 min that is used to estimate iceberg velocities.