Assessing issues associated with a time-integrated fluvial fine sediment sampler
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Date
2019-03-27
Authors
Goharrokhi, Masoud
Pahlavan, Hoda
Lobb, David A.
Owens, Philip N.
Clark, Shawn P.
Journal Title
Journal ISSN
Volume Title
Publisher
John Wiley and Sons, Ltd
Abstract
Collecting a representative time‐integrated sample of fluvial fine‐grained suspended
sediment (<63 μm) is an important requirement for the understanding of environmental,
geomorphological, and hydrological processes operating within watersheds. This
study (a) characterized the hydrodynamic behaviour of a commonly used timeintegrated
fine sediment sampler (TIFSS) using an acoustic Doppler velocimeter
(ADV) in controlled laboratory conditions and (b) measured the mass collection
efficiency (MCE) of the sampler by an acoustic Doppler current profiler under field
conditions. The laboratory results indicated that the hydrodynamic evaluations associated
with the original development of the TIFSS involved an underestimation of the
inlet flow velocity of the sampler that results in a significant overestimation of the
theoretical MCE. The ADV data illustrated that the ratio of the inlet flow velocity
of the sampler to the ambient velocity was 87% and consequently, it can be assumed
that a representative sample of the ambient fine suspended particles entered into the
sampler. The field results showed that the particle size distribution of the sediment
collected by the TIFSS was statistically similar to that for the ambient sediment in
the Red River, Manitoba, Canada. The MCE of the TIFSS in the field trials appeared
to be as low as 10%. Collecting a representative sample in the field was consistent
with the previous findings that the TIFSS is a suitable sampler for the collection of
a representative sample of sufficient mass (e.g., >1 g) for the investigation of the
properties of fluvial fine‐grained suspended sediment. Hydrodynamic evaluation of
the TIFSS under a wider range of hydraulic conditions is suggested to assess the
performance of the sampler during high run‐off events.
Description
Keywords
fine sediment sampler, fluvial suspended sediment, mass collection efficiency, particle size
Citation
Goharrokhi M, Pahlavan H, Lobb DA, Owens PN, Clark SP. Assessing issues associated with a timeintegrated fluvial fine sediment sampler. Hydrological Processes. 2019;33:2048–2056. https://doi.org/10.1002/hyp.13451