335
These changes are difficult to contemplate as they assume that the jetty lined
entrance can scour sufficiently to accommodate the additional flow. At present the
field data give no hint of stabilization and the changes in tidal range and channel
scour continue unabated.
10.3.4 Lake Macquarie
Lake Macquarie is on the NSW central coast some 25 km south of Newcastle
(Fig. 10.17). The bay has a plan area of around 110 km
2
and is connected to the
ocean by an irregular 4,700 m long Swansea Channel (Fig. 10.18) of average depth
around 2.0 m, average width around 400 m and with various forms of rock bank
protection along much of its length. It has dual highway bridges crossing the
entrance channel that constrain the tidal flow. The bay spring tidal range is around
Fig. 10.13 Wallis Lake inlet prior to training wall and jetty (breakwater) construction and showing proposed jetties (water depths given in feet to Indian Springs Low Water – ISLW; Survey Plan
courtesy of NSW Government)
10 Long Term Impacts of Jetties and Training Walls on Estuarine Hydraulics…
These changes are difficult to contemplate as they assume that the jetty lined
entrance can scour sufficiently to accommodate the additional flow. At present the
field data give no hint of stabilization and the changes in tidal range and channel
scour continue unabated.
10.3.4 Lake Macquarie
Lake Macquarie is on the NSW central coast some 25 km south of Newcastle
(Fig. 10.17). The bay has a plan area of around 110 km
2
and is connected to the
ocean by an irregular 4,700 m long Swansea Channel (Fig. 10.18) of average depth
around 2.0 m, average width around 400 m and with various forms of rock bank
protection along much of its length. It has dual highway bridges crossing the
entrance channel that constrain the tidal flow. The bay spring tidal range is around
Fig. 10.13 Wallis Lake inlet prior to training wall and jetty (breakwater) construction and showing proposed jetties (water depths given in feet to Indian Springs Low Water – ISLW; Survey Plan
courtesy of NSW Government)
10 Long Term Impacts of Jetties and Training Walls on Estuarine Hydraulics…