Sauter mean diameter determination for the fine fraction of suspended sediments using a LISST-25X diffractometer

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ABSTRACT

The L1SST-25X ability for measuring the Sauter mean diameter of the fine fraction of sediment samples, SMD/. is evaluated. A simple algorithm to determine the SMDf is proposed. The algorithm is based on the standard output variables from the L1SST-25X diffractome-ter Sauter mean diameter of the complete sample, SMD(; Sauter mean diameter of the coarse fraction,SMDg; total suspended sediment concentration, SSC,, and coarse suspended sediment concentration, SSCS. Validation is performed in the laboratory by contrasting algorithm results from complete sediment samples against LISST SMD( measurements made on the fine fraction of the samples. A second validation is performed by comparison between algorithm results and Malvern measurements on the same samples. The samples are from the Salado River (Argentina) and the Parana River (Argentina). Their SMD( range from 10 (.im to 70 u,m.

Results indicate that the algorithm determines the Sauter mean diameter of the fine fraction in a reliable way, with average differences of 1.4 (im (algorithm-LlSST comparison) and 3.4 u,m (algorithm-Malvern comparison). The observed differences are attributed to operational conditions rather than to algorithm limitations. A correlation between calculated SMDf and dsoof the fine fraction is also established, with a determination coefficient ofR2 = 0.46.

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