Author(s): L. C. Vanrijn; L. E. A. Nienhuis
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Keywords: No Keywords
Abstract: A new instrument for the lnrsitu determination of the fall or settling velocity of silt particles ln the range of 5 to 100 μm has been deslgned. The determination of the fall velocity curve is based on the princlple of the Andreasen- Esenwein Pipet, which is the wI thdrawal of water-sediment samples at the side wall of the sed lmentation tube at preset times. The new instrument is lowered horizontally in the stream with opened valves on both ends of the' tube. Arrived at the actual sampling point in the stream, the valves are closed and the tube is put ln a vertical position (start of sed imentation process). After that the instrument 18 raised. Comparison of the new instrument and the commercially available (Sartorius) bal anceaccumulatlon tube shows good results for concentrations larger than 20 mg/l.
Year: 1985