New methods for ADV measurements of turbulent sediment fluxes: application to a fine sediment plume

Abstract:An Acoustic Doppler Velocimeter (ADV) is used to measure turbulent fluxes of fine sediments in a turbidity plume. In addition, optimal instrument settings are determined in order to maximally extend the calibration range for suspended sediments. Different types of noise are found in both the velocity signal and the backscatter amplitude, which is used for the determination of sediment concentration. Therefore, spectral noise correction methods have been developed which allow the determination of turbulent velocity and sediment concentration fluctuations. The technique is applied to two benchmark cases of a vertical sediment-laden jet. Reynolds stresses, turbulent intensity of velocity and sediment concentration as well as turbulent sediment fluxes are shown to agree well with two-fluid plume measurements reported in literature. The methods presented in this paper can be applied in the processing of measurements in cohesive sediment plumes, turbidity currents or mixing layers in absence of or in stable flocculation.

Publication year:2015

Keywords:General & traditional engineering, Environmental science & technology

BOF-keylabel:yes

IOF-keylabel:yes

BOF-publication weight:0.1

CSS-citation score:1

Authors:National

Authors from:Private

Accessibility:Closed