Case Studies
Nov 24, 2022

In-Stream Laser Diffraction for Measuring Suspended Sediment Concentration and Particle Size Distribution in Rivers: Insights from Field Campaigns

Publication: Journal of Hydraulic Engineering
Volume 149, Issue 2

Abstract

This study evaluates the laser in situ scattering and transmissometry (LISST) instrument LISST-SL2, a laser diffraction instrument for suspended sediment sampling in rivers, with concurrent physical measurements of suspended sediment concentration (SSC) and particle size distribution (PSD) as well as velocity measurements by an acoustic Doppler current profiler (ADCP). We collected 136 LISST-SL2 samples along with 61 physical samples for SSC measurement, of which 24 physical samples included PSD measurement during 2018–2020 from 11 sites in Washington state and Virginia. An effective density is required to convert the measured volumetric SSC by the LISST-SL2 into a reported mass SSC, and by default the LISST-SL2 assumes a value of 2.65  g/mL. From our data set, we computed effective densities (mass SSC/volumetric SSC) that ranged from 0.5 to 5.4  g/mL, with a best-fit value of 2.05  g/mL. Additionally, the LISST-SL2 was not able to measure the finest sediment sizes in suspension, which affects the resulting PSD. Therefore, we propose some adjustments of the LISST-SL2 data with a supporting physical sample to account for these effective density and PSD issues. When doing so, we were able to reduce the root-mean square relative error (RMSRE) to 18% from 117% for SSC, and to 26% from 78% for PSD. LISST-SL2 velocities were generally higher than ADCP velocities with a 21% RMSRE. Our results and guidance will allow for more accurate sampling by the LISST-SL2, which has potential for studying spatial and temporal variation of suspended sediment characteristics in rivers.

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Data Availability Statement

Some or all data, models, or code generated or used during the study are available in a repository online in accordance with funder data retention policies. Data for this research are available at Curran et al. (2022): https://doi.org/10.5066/P9SPVN51.

Acknowledgments

This work was funded by the Federal Interagency Sedimentation Program (FISP). We thank Yogi Agrawal (retired from Sequoia Scientific) for guidance on identifying erroneous laser diffraction measurements. We thank Scott Anderson (USGS), two anonymous reviewers, Associate Editor (anonymous), and Chief Editor (Fabian A. Bombardelli) for carefully reviewing our manuscript and for providing thoughtful and insightful comments that helped improve our work.

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Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 149Issue 2February 2023

History

Received: Feb 3, 2022
Accepted: Sep 25, 2022
Published online: Nov 24, 2022
Published in print: Feb 1, 2023
Discussion open until: Apr 24, 2023

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Graduate Research Assistant, Dept. of Biological Systems Engineering, Virginia Tech, 155 Ag Quad Ln., Blacksburg, VA 24061. ORCID: https://orcid.org/0000-0002-3995-6507
P.E.
Assistant Professor, Dept. of Biological Systems Engineering, Virginia Tech, 155 Ag Quad Ln., Blacksburg, VA 24061 (corresponding author). ORCID: https://orcid.org/0000-0002-9485-2604. Email: [email protected]
Assistant Center Director for Hydrologic Data at the USGS Pacific, US Geological Survey, Pacific Islands Water Science Center, 1845 Wasp Blvd., B176, Honolulu, HI 96818. ORCID: https://orcid.org/0000-0001-8933-416X

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