The Regulate Section Channel Model for Maintenance Channel in Estuary

Abstract

River estuaries hold an important role apart from being a channel for channeling floods to the sea, as well as a channel for water transportation. Silting, narrowing, moving and closing of the channel due to sedimentation have become serious problems generally occurring in estuaries. Handling so far has been handled by the construction of jetty,dredging, building underwater sills and fluidization. These methods do not seem to be the right solution in certain conditions, especially regarding costs and environmental impacts. The sistem of the Arrangement Section Channel Model, which, with its velocity, can flush sediment, is an alternative solution to the problem above. Parameters that influence this research are cross-sectional parameters, flow parameters and sediment parameters formulated in the equation Qs = ƒ (b, b*, h*, h, u, t, Q, g, ρw, μ, ρS). Where Qs is the flushed sediment discharge, b is the width of the river, b* is the width of the flushing section, h* is the height of the flushing section, “h” is the water level, u is the flow velocity, t is the tidal period, Q is river discharge, g is gravity, w is water mass density, is fluid viscosity and s is sediment mass density. The research used was experimental at the River Laboratory of Civil Engineering, Faculty of Engineering, Hasanuddin University. The research results show that the greater the composite cross-sectional width ratio value, the greater the Reynolds number, and the critical shear stress causes flushing sediment discharge, which is greater than the composite cross-sectional height ratio, which is larger and causes flushing sediment discharge to decrease. The flushing pattern occurs when sediment deposition occurs in the upper reaches of the river and scours downstream in the estuary mouth area, where the amount of deposited and eroded material increases as the percentage of the composite cross-section is large but setting the cross-section with a percentage that is too large, seems to change the scour deposition to the upstream area. The Meyer Peter Muller (MPM) equation is closer to this research.

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