IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Field measurements of suspended sediment using several methods
Field measurements of suspended sediment using several methods
Field measurements of suspended sediment mass concentration (SSC) and particle size distribution (PSD) with high temporal resolution and good accuracy are required for a better understanding and management of many fine-sediment related processes. This paper deals with the recent field study on SSC and PSD in the turbine water at the high-head hydropower plant (HPP) Fieschertal in the Swiss Alps. Various types of turbidimeters, a ¡®Laser in-situ Scattering and Transmissiometry¡¯ (LISST) device and a single-frequency acoustic attenuation method were used for continuous sus-pended sediment measurements (SSM). The obtained data were converted to SSC based on reference SSCs gravi-metrically determined from bottle samples. Furthermore, PSDs were obtained by LISST every minute. The results showed a high temporal variability of SSC and PSD as well as a weak correlation between them. During a sediment transport event with a SSC peak of almost 12 g/l, the particles were temporarily coarser than usual and the turbidimeters as well as the acoustic method underestimated SSC by up to 80%. However, the SSCs obtained by LISST agreed reasonably well with the reference SSCs despite occasional PSD variations. Based on these findings, the LISST technique in combination with automatic bottle sampling is recommended among the tested methods for SSM in sediment environments where PSD varies independently of SSC.
File Size : 329,777 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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