The LISST-SL streamlined isokinetic suspended-sediment profiler
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Abstract
The new manually deployed Laser In Situ Scattering Transmissometer-StreamLined profiler (LISST-SL) represents a major technological advance for suspended-sediment measurements in rivers. The LISST-SL is being designed to provide real-time data on sediment concentrations and particle-size distributions. A pressure sensor and current meter provide real-time depth and ambient velocity data, respectively. The velocity data are also used to control pumpage across an internal laser so that the intake velocity is constantly adjusted to match the ambient stream velocity. Such isokinetic withdrawal is necessary for obtaining representative sedimentary measurements in streamflow, and ensures compliance with established practices. The velocity and sediment-concentration data are used to compute fluxes for up to 32 particle-size classes at points, verticals, or in the entire stream cross section. All data are stored internally, as well as transmitted via a 2-wire conductor to the operator using a specially developed communication protocol. The LISST-SL's performance will be measured and compared to published sedimentological accuracy criteria, and a performance summary will be placed on-line.
Suggested Citation
Gray, J.R., Agrawal, Y.C., and Pottsmith, H.C., 2004, The LISST-SL streamlined isokinetic suspended-sediment profiler, in Proceedings of the Ninth International Symposium on River sedimentation: October 18-21, 2004 Yichang, China, v. IV, p. 2549-2555.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | The LISST-SL streamlined isokinetic suspended-sediment profiler |
| Volume | IV |
| Year Published | 2004 |
| Language | English |
| Publisher | Tsinghua University Press |
| Contributing office(s) | Office of Surface Water |
| Description | 7 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the Ninth International Symposium on River sedimentation: October 18-21, 2004 Yichang, China |
| First page | 2549 |
| Last page | 2555 |