| Summary: | ABSTRACT
Problem on river mouth and navigation channel is caused by sediment accumulation on the river mouth and navigation channel. Sedimentation pattern and process on river estuary and navigation channel are influenced by bed sediment, current, and marine hydro dynamic. Remedial solution that is generally performed is relatively expensive. Fluidization method can be an economical alternative for overcoming the problem on river mouth and navigation channel. The goal of this research is to evaluate the influence of fluidization variables such as perforation diameter (di), perforation distance (a) and perforation position (a), on the fluidization system.
The research with physical model test was carried out at Hydraulic and Hydrology Laboratory, Research Centre for Engineering Science Gadjah Mada University. It comprises of three studies : fluidization basic study, influence among parameters, and case study on Sambong estuary. Basic research of fluidization was conducted using variation of sediment thickness (db), tube diameter (D). The effect among parameters was investigated by varying perforation diameter (df), perforation distance (a), perforation position (a), and sediment thickness (db). The case study on Sambong estuary was conducted using scale model of 1:12 .
From basic research it could be concluded that pressure height needed for fluidization was approximately equal to the sediment thickness, in fluidization tube. But in real problem, where the pipe is laid horizontally under river bed mouth, the minimum pressure needed is as high as 12 times the sediment thickness. In the research river mouth of Sambong, fluidization may be used depending on capacity and head of pump, and flow available that the main consideration in the design of fluidisation system, because suspended sediment will be still in suspension if there is no current/flow to carry the suspension to a lower level area.
Key words : Fluidization, river mouth, navigation channel.
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