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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Research Methods
Despiking Ultrasonic Doppler
Velocity
-Profiling Data
Abstract
A practical method for detecting and removing anomalous velocity
spikes in ultrasonic Doppler
velocity
-profiling (UDVP) data is presented. UDVP applies the pulsed ultrasonic Doppler effect to measure instantaneous flow velocities,
using
the rate of movement of suspended particles within the flow as a proxy. This technique has become popular in laboratory studies of sediment erosion, transport, and deposition, because of its ability to acquire high-resolution velocimetric data at a wide range of suspended-sediment concentrations in, for example, hyperconcentrated river flows, transient turbulent mudflows, and turbidity currents.
Velocity
data recorded by UDVP transducers that are not part of the genuine
velocity
signal are collectively known as
velocity
spikes. The new technique to detect
velocity
spikes proposed here is based on a simple, combined acceleration and magnitude threshold method, with a piecewise Hermite cubic interpolation of four adjacent
velocity
measurements used to remove the detected
velocity
spikes. 110 datasets covering different combinations of
velocity
and suspended-sediment concentration were used to test the MatLab-coded despiking algorithm, and to make recommendations for best practice in future UDVP-based studies.
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