Monitoring Settling and Consolidation of Fluid Mud in a Laboratory Using Ultrasonic Measurements

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Abstract

Ultrasound measurements are routinely used to evaluate the safe depth for ships navigation-nautical depth-at waterways and ports using single-beam dual-frequency echo-sounders. The nautical depth is routinely defined by suspension density in the range of 1100-1300 kg/m3 in the mud layer. While ultrasound measurements have a weak sensitivity to density variations, calibration is always needed to convert ultrasound measurements into reliable indicators for nautical depth levels in the mud layers using densely distributed density rheological in-situ measurements. We present a laboratory ultrasonic transmission experiment to monitor the fluid mud's settling and consolidation processes using a sample from the Port of Rotterdam. We use P-and S-wave ultrasonic transducers in the frequency range between 200 to 1000 kHz. Our results show that the P-wave velocities slightly increase during the consolidation and settling process while the P-wave amplitudes decrease. On the other hand, we observe a high S-wave velocity that increases together with amplitudes over time. The P-and S-wave amplitude and S-wave velocity variation over time correlate well with the mud average density variation. The presented results can be very useful for fluid-mud monitoring at a lab scale, besides possible utilization for large-scale monitoring field campaigns.
Original languageEnglish
Title of host publicationNSG2021 27th European Meeting of Environmental and Engineering Geophysics
Subtitle of host publicationAugust 29, 2021 - September 2, 2021
PublisherEAGE
Number of pages5
ISBN (Electronic)9789462823860
DOIs
Publication statusPublished - 2021
EventNSG2021 27th European Meeting of Environmental and Engineering Geophysics -
Duration: 29 Aug 20212 Sep 2021

Publication series

Name27th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2021, NSG 2021

Conference

ConferenceNSG2021 27th European Meeting of Environmental and Engineering Geophysics
Period29/08/212/09/21

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