In 2012 verloren we Jean Jacques Peters, voormalig ingenieur van het Waterbouwkundig Laboratorium (1964 tot 1979) en internationaal expert in sedimenttransport, rivierhydraulica en -morfologie. Als eerbetoon aan hem hebben we potamology (http://www.potamology.com/) gecreëerd, een virtueel gedenkarchief dat als doel heeft om zijn manier van denken en morfologische aanpak van rivierproblemen in de wereld in stand te houden en te verspreiden.
Het merendeel van z’n werk hebben we toegankelijk gemaakt via onderstaande zoekinterface.
Ultrasound image velocimetry (UIV) is a technique that enables non-intrusive whole-fow feld velocimetry measure?ments in opaque fuids. It gained interest in experimental fuid dynamics to study the fow mechanics of, amongst others, sediment-laden fuids. Further customisation of this technique is required to make it a reliable asset for experimental research involving high density cohesive sediments (fuid mud). Potential applications include rheological or settling experiments or experiments serving nautical research on the interaction between a ship, water and fuid mud forming the bottom of the navigation channel. This study presents experiments to validate the applicability of UIV in such dense cohesive sediments exhibiting non-Newtonian and thixotropic behaviour. During these experiments, an ultrasound transducer was moved through stationary mud at known velocities. Due to the viscosity of the mud, the zone of infu?ence of the moving transducer is limited in depth. This enables the recording of the relative velocity between moving transducer and the undisturbed mud at greater depths. Medical ultrasound imaging equipment was used, as such equip?ment allows ultrasound imaging in the required frequency range and frame rate. A good correlation (accuracy > 95 %) was found between the imposed motion velocity of the transducer and the output of UIV. However, limitations were found in both depth and velocity, caused by the equipment, settings and mud properties
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