Evaluation of a simple, inexpensive, in situ sampler for measuring time‐weighted average concentrations of suspended sediment in rivers and streams
| Autor: | David T. Welsh, Nicholas J. C. Doriean, William W. Bennett, Andrew Brooks, Peter R. Teasdale |
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| Přispěvatelé: | Doriean, Nicholas JC, Teasdale, Peter R, Welsh, David T, Brooks, Andrew P, Bennett, William W |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Suspended solids
010504 meteorology & atmospheric sciences fungi 0207 environmental engineering in situ Sampling (statistics) Sediment Soil science 02 engineering and technology STREAMS particle size 01 natural sciences complex mixtures Current (stream) suspended sediment concentration Particle-size distribution Environmental science Spatial variability Particle size 020701 environmental engineering suspended sediment sampler 0105 earth and related environmental sciences Water Science and Technology |
| Popis: | The accurate measurement of suspended sediment (< 200 μm) in aquatic environments is essential to understand and effectively manage changes to sediment, nutrient and contaminant concentrations on both temporal and spatial scales. Commonly used sampling techniques for suspended sediment either lack the ability to accurately measure sediment concentration (e.g. passive sediment samplers) or are too expensive to deploy in sufficient number to provide landscape‐scale information (e.g. automated discrete samplers). Here we evaluate a time‐integrated suspended sediment sampling technique, the pumped active suspended sediment (PASS) sampler, which collects a sample that can be used for the accurate measurement of time‐weighted average (TWA) suspended sediment concentration and sediment particle size distribution. The sampler was evaluated against an established passive time‐integrated suspended sediment sampling technique (i.e. Phillips sampler) and the standard discrete sampling method (i.e. manual discrete sampling). The PASS sampler collected a sample representative of TWA suspended sediment concentration and particle size distribution of a control sediment under laboratory conditions. Field application of the PASS sampler showed that it collected a representative TWA suspended sediment concentration and particle size distribution during high‐flow events in an urban stream. The particle size distribution of sediment collected by the PASS and Phillips samplers were comparable and the TWA suspended sediment concentration of the samples collected using the PASS and discrete sampling techniques agreed well, differing by only 4% and 6% for two different high‐flow events. We should note that the current configuration of the PASS sampler does not provide a flow‐weighted measurement and, therefore, is not suitable for the determination of sediment loads. The PASS sampler is a simple, inexpensive, and robust in situ sampling technique for the accurate measurement of TWA suspended sediment concentration and particle size distribution. Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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