Cabbage Tree Point Dredging and Beach Nourishment 2016
Dredging has commenced in the Main Channel North at Cabbage Tree Point. Approximately 15,700m3 of material will be dredged from the channel to a designed depth of -2.7m LAT. The sand will be placed on the foreshore at Cabbage Tree Point, adjacent to the channel.
The Cabbage Tree Point dredge site is located on the Main Channel North, north of Jacobs Well, and south of the Tabby Tabby Channel confluence, adjacent to the Cabbage Tree Point boat ramp. Immediately adjacent to the dredge area, land is developed for residential uses, and many of the lots with water frontage have private jetties extending into deeper waters to allow low tide use.
The dredge area begins approximately 15 m north of the Cabbage Tree public boat ramp, extending southwards for approximately 500m.
The works are required to maintain safe navigable depth within the Main Channel North, which has been impacted by significant sand deposition and shoaling. This channel forms the primary movement channel for vessels travelling between the northern and southern areas of Moreton Bay, and it is therefore important to maintain navigable depths under all tidal conditions. Due to build-up of sand, water depths within the defined navigation channel at low tide are reduced to under one metre in some areas. Beach nourishment for recreational amenity is the selected dredge material management option to improve the amenity of the foreshore and provide additional protection to land which has been subject to steady erosion.
The Cutter Suction Dredge,Nu Discovery will be used for this project. The Nu Discovery is a 200mm cutter suction dredge from the Nu Explorer series of dredges. The Nu Explorer series of dredges have been designed and constructed by Neumann Dredging to specifically suit the typical dredging conditions encountered in projects like the Cabbage Tree Point Dredging Project. There are three dredges in the Nu Explorer series that currently complement our fleet (total of 9 Cutter Suction Dredges):
- Nu Explorer (original dredge in the Nu Explorer Series) has been working in the OTML Mine in PNG for the last two years,
- Nu Discovery has recently completed works in the Iluka Boat Harbour and Entrance Channel Dredging project,
- Nu Investigator, is the latest in the fleet and has just completed initial trials and testing at Neumann Contractors, Corridor Sands plant at Woongoolba.
Dredge 12, Nu Discovery is a 227kW (305hp) 200mm three wire cutter suction dredge. The dredge is capable of dredging up to 120m3 per hour (in optimal conditions), dredge to a maximum depth of 6.5 metres, and pump the material up to 1,200m in distance.
Dredge 12 – Nu Discovery from the Nu Explorer series of Neumann Contractor designed and constructed CSDs