Dealing with larger water columns

As described in Velocity types – methods of defining velocity profiles, the Water Velocity Profile makes depth conversion with large water columns easier and more accurate. Depth residuals after depth conversion of seabed reflections can still occur but may be more related to laterally varying seabed reflectivity, datuming issues and seismic phase issues. The global dataset on which this method is based also captures global variations in water temperature and salinity, mainly affecting velocities above 1000 m depth. On the basis of the observed residuals, you may decide to tune the water velocities to be faster or slower than the average but always within the limits of actual observations.