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The agreements between field monitoring and numerical results were promising therefore, the finite element models can be used to predict the behavior of geotube on those muddy coast areas with similar hydrodynamic and geological conditions.Īnfuso, G. The structural stability and structure’s height reduction due to foundation settlement are essential considerations in breakwater design. Two-dimensional finite element analysis was performed to simulate the deformation and the displacement of geotube breakwater subjected to hydrodynamic loads, taking into account of deformable foundation condition. The field measurements were carried out on quarter-yearly basis to assess the behavior of geotube under hydrodynamic forces. Hence, this study evaluates the behavior of geotube breakwaters installed on a deformable muddy foundation based on field measurements and numerical analysis. However, design approach for geotube which functions as breakwater on deformable muddy foundation and subjected to hydrodynamic loads has not been well reported. Previous researchers have presented analytical, empirical and numerical approaches for geotube design. Other issues such as achieving a balanced positioning of the tow 30.6 m long tubes and avoiding tube displacement during the filling process caused by the barge rocking from the wash of Brisbane Cit圜at water-taxi boats passing nearby were addressed by placing water filled road barriers along the outer edge of each tube.The use of geotubes is now common in coastline protection due to notable advantages such as erosion prevention, competitive cost and speedy installation procedures. Polymer dosing, in this instance was complicated by the saline nature of the river water in the pipe. To determine the correct polymer type and dosing concentration a representative sample of dredge slurry was sent to the Geofabrics Center of Excellence Laboratory for analysis, and a specialist polymer supplier with the capability to provide dosing equipment engaged to assist with this element of the work. To ensure rapid and effective dewatering it was necessary to dose sediments with a polymer flocculant. The quality of liquids discharged from the tube had to be controlled and meet environmental requirements in order to be allowed to flow back into the river. Sediment excavated by the remotely controlled dredger would be pumped into the Geotube® dewatering units and dewatered on the barge which would then be towed downriver to a location where the dewatered sediments could be excavated and disposed.
SUBMERGE BREAKWATER GEOTUBE HOW TO
The challenge faced by the specialist contractor was how to contain sludge excavated from a blocked stormwater pipe by a remote-controlled underwater dredger operating in constricted conditions in a location highly visible to the public and required to meet stringent environmental and operating mandates.Ĭhallenges ranging from identifying a method of containing and dewatering dredged sediments and applying a suitable polymer flocculant in a saline water environment to sediments that varied from fine contaminated clay to residual sand deposits as well as avoiding all risk of accidental discharge of contaminated sediments into the river had to be addressed before work could proceed.įollowing discussions of the challenges faced by Desilting Solutions, a contractor specializing in remote underwater dredging it was proposed to place two GT500D Geotube® dewatering units 30.6m in length laid adjacent to each other on a barge moored next to another barge controlling the remote dredging equipment. The submerged location of the outfall of the pipe required the dewatering be conducted from barges moored in the Brisbane river. This technically difficult project required a variety of innovative solutions to meet operational and environmental requirements. Exhumed sediments were pumped into Geotube® dewatering units placed on a barge moored in the river.
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In a first of its kind application in Australia a specially designed remote-controlled underwater dredger was deployed to excavate and clean out a blocked stormwater drain discharging into the Brisbane river.