Volume Changes on a Sand Gravel Barrier at a Groyne Construction, Haumoana, Hawke Bay, New Zealand.

At the site of a groyne construction a single profile line on the updrift side was repeatedly surveyed seven times at frequent intervals over 90 days when the groyne acted as an effective sediment trap. Over this time period the net accumulation was 839 m³/m, however variations in the incident wave energy gave sediment accumulation rates of some -0.1 m³/m to 7.4 m³/m per day. This variation of the sediment volume could be related to the incident breaking wave steepness for the periods pre; during and post construction. [ABSTRACT FROM AUTHOR]