United States Department of Transportation
i
Investigation of sediment suspension technology.
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2016-10-01
[PDF-734.64 KB]
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Abstract:The goal of the project was to critically review existing literature to access currently available devices, the
identification of areas of improvement for future designs, and the outline of a new-generation cohesive sediment
erosion measuring device. The results of this investigation shows that several devices exist for the measurement of
cohesive sediment erosion upon which there are great opportunities for improvement. Most significantly, the
availability of technologies such as laser Doppler velocimeters and bed mapping systems would allow for the
noninvasive measurement of key parameters directly in the field. The introduction of such instruments to the
framework of existing flume devices would allow for greater accuracy in determining a relationship between bed
shear stress and suspended sediment concentration. Direct measurement of the flow profile by the LDV would erase
the potential for error where flows were previously estimated. Acoustic bed mapping technology has already been
successfully utilized in the NIWA-II flume to noninvasively measure the erosion process (Aberle et al. 2004,
Debnath et al. 2007). However, the integration of more advanced technologies, whether laser-based or acoustic, has
the potential to improve accuracy and resolution in measurements. The development of the proposed device is
realistic and achievable, and would enhance the understanding of cohesive sediment erosion.
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