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    Acoustic monitoring of hydraulic resistance in partially full pipes.

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    A.ROMANOVA.pdf (18.69Mb)
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    Publication date
    2014-05-07
    Author
    Romanova, Anna
    Supervisor
    Horoshenkov, Kirill V.
    Tait, Simon J.
    Keyword
    Hydraulic resistance
    Sewer pipes
    Hydraulic losses
    Propensity to flood
    Hydraulic resistance measurement
    Hydraulic roughness measurement
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    School of Engineering, Design and Technology
    Awarded
    2013
    
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    Abstract
    Hydraulic losses in sewer pipes are caused by wall roughness, blockages and in-pipe sedimentation. Hydraulic resistance is a key parameter that is used to account for the hydraulic energy losses and predict the sewer system propensity to flood. Unfortunately, there are no objective methods to measure the hydraulic resistance in live sewers. A common method to estimate the hydraulic resistance of a sewer is to analyse collected CCTV images and then to compare them against a number of suggested hydraulic roughness values published in the Sewer Rehabilitation Manual. This thesis reports on the development of a novel, non-invasive acoustic method and instrumentation to measure the hydraulic roughness in partially filled pipes under various structural and operational conditions objectively. This research presents systematic laboratory and field studies of the hydraulic and surface water wave characteristics, of shallow water flows in a sewer pipes with the presence of local and distributed roughness, in order to relate them to some fundamental properties of the acoustic field measured in the vicinity of the flow surface. The results of this thesis indicate that for the local roughness the energy content of the reflected acoustic signal is an indicator of the pipe head loss and hydraulic roughness. In the case of the distributed roughness, the variation in the temporal and frequency characteristics of the propagated sound wave can be related empirically to the mean flow depth, mean velocity, wave standard deviation and hydraulic roughness.
    URI
    http://hdl.handle.net/10454/6321
    Type
    Thesis
    Qualification name
    PhD
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