Performance of sediments dispersed in swales

Lavalie, Patrick James (2015) Performance of sediments dispersed in swales. MSc dissertation, University of Portsmouth.

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    The aim of this research is to investigate the performance sediment in swale and understand the effectiveness of using artificial turf to simulate natural grass. To achieve these objectives, an experiment was conducted and tested at the University of Portsmouth by constructing a channel in the shape of a swale (0.5 x2.1m) and lined with artificial grass 20mm high. Due to the time and equipment available, the variable tested in the experiment was slope as a variable and a grassed.
    Sediments sizes usually found in road runoff ranging from 425μm - 63μm sand were used in the experiment by simulating hydrograph. The sediments composed of natural sand and UV visible sand of sizes 200μm and 120μm. A container (0.3m) was used to simulate the flow through the swale, while a water bath was placed at the end of the channel to collect sediments travelling pass the swale.
    A total of 26 cut samples were collected at 0, 0.25, 0.5, 1.0, 2.0m respectively to determine the particles trapped within these locations by weighing and counting the UV particles present. Significant deposition of sediment was notice between the head works and the midpoint of the swale whereas less transport was noticed towards the end of the swale.
    Sediment models were used to ascertain the results from the experiment namely the Aberdeen equation model and the settling frequency model. As expected under very low hydraulic condition, the sediment transported showed significant reduction along the swale length. The smallest sand particles are the most likely to be transported while the larger sizes the most to be deposited.
    In an attempt to determine the number of various UV sand particles found at the sampling location, the quantity of particles found along these sections showed a random haphazard behaviour and no relationship could be established between the particles found, size and mass present.
    It was concluded that artificial grass can be used in the place of grass as they possess the potential of treating sediments under low flow condition.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Jane Polwin
    Date Deposited: 12 Nov 2015 16:23
    Last Modified: 12 Nov 2015 16:23

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