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Feasibility study for the use of a CT scan and ultrasound acoustic measurement techniques to visualise the internal structure of cohesive sediments
Van Parys, P. (2014). Feasibility study for the use of a CT scan and ultrasound acoustic measurement techniques to visualise the internal structure of cohesive sediments. MSc Thesis. KU Leuven. Faculteit Industriële Wetenschappen - Campus Gent: Gent. 96 pp.

Beschikbaar in  Auteurs 
Documenttype: Doctoraat/Thesis/Eindwerk

Trefwoorden
    Acoustic measurement
    Sediments > Cohesive sediments
    Techniques

Auteurs  Top 
  • Van Parys, P.
  • Claeys, S., revisor, meer
  • Staelens, P., revisor

Abstract
    Dredging is a very expensive and extensive industrial sector applied to cope with the problems in harbours and constructions in water bodies due to siltation, whereby maintenance dredging is absolutely necessary for the moment in order to meet with the trading standards of nowadays. Cutting down these costs and efforts could be done by liquefying the seabed instead of removing it with dredging vessels. In order to study these possibilities, one must understand and examine the mud’s resistance against shear in solid state (by looking at the internal structure) and in liquid state (by studying rarefaction phenomena in Non-Newtonian fluids). Internal structure can be visualised with x ray CT scans, providing very satisfying results, but coming with the obligatory permits (severe safety precautions), staff, infrastructure etc. A shortcut could possibly be made using more accessible technology and equipment, being ultrasound. Therefor one first needs to study it’s fundamentals and possible boundary problems. A very important first choice one has to make is to discuss the scale of interests. Is it sufficient to focus on large structure homogeneities and study them further on or does one need to obtain detailed information on to the clay fraction scale. The latter one can only be met with x ray CT, the first provides other possibilities to study on the consolidations columns in FHR. Applying concave profiling ultrasound transducers for cylindrical columns or using multiple fixed transducers systems etc. could provide us the necessarily structural information. A second step is to separate minimum required information (large structures) from less necessary information using ultrasound and thereby cutting down the amount of x ray CT scans sensitively, thus being complementary.

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