348
10.4.2 Lake Macquarie
Since the jetties were constructed at Lake Macquarie, the Swansea Channel has
been scouring and its foreshores have been eroding, necessitating groin and revetment construction, some of which is collapsing. Detailed bathymetric surveys
undertaken in 1996 and 2008 (Fig. 10.29) indicated that the channel was scouring
over that period at an average rate of around 25,000 m
3
/a, with the bay’s flood tide
Fig. 10.29 Bed level changes in Swansea Channel 1996–2008 (Watterson 2010; courtesy Lake
Macquarie Council). Up to 5 m of sand accretion has been measured on the leading edges of the
flood tide deltas entering the bay and the ebb tide delta at the ocean entrance. Sand has come from
channel deepening and erosion of the beach on the south side of the channel near the ocean
entrance
A.F. Nielsen and A.D. Gordon
10.4.2 Lake Macquarie
Since the jetties were constructed at Lake Macquarie, the Swansea Channel has
been scouring and its foreshores have been eroding, necessitating groin and revetment construction, some of which is collapsing. Detailed bathymetric surveys
undertaken in 1996 and 2008 (Fig. 10.29) indicated that the channel was scouring
over that period at an average rate of around 25,000 m
3
/a, with the bay’s flood tide
Fig. 10.29 Bed level changes in Swansea Channel 1996–2008 (Watterson 2010; courtesy Lake
Macquarie Council). Up to 5 m of sand accretion has been measured on the leading edges of the
flood tide deltas entering the bay and the ebb tide delta at the ocean entrance. Sand has come from
channel deepening and erosion of the beach on the south side of the channel near the ocean
entrance
A.F. Nielsen and A.D. Gordon