IIHR's
Sediment Laboratory, 12 ft by 18 ft in size, is located in IIHR's Model
Annex. The laboratory is equipped with basic instruments with which most
sediment analyses, except chemical analyses, can be made. They include
electronic and chemical balances, a constant-temperature oven, sets of
sieves for sieve analyses, a filtering system with a vacuum pump, a
system for the visual-accumulation tube (VA) method to determine
sediment particle's fall diameters, settling tubes, etc.
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| Iowa
Rapid Sediment Analyzer (IRSA) |
|
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| IIHR's
sediment laboratory |
Left: An Iowa
Rapid Sediment Analyzer (IRSA) invented by Dr. Tatsuaki Nakato in 1989
is also located in the laboratory. This simple settling-tube device
determines fall-velocity and particle-size frequency distributions and
specific gravities of sand-range sediment particles. After a sediment
sample is released at the top of the settling tube, the apparatus
measures the hydrostatic pressure at a lower point on the tube
as sediment particles settle past that point. The measured time history of
pressure variations provides a frequency distribution of fall velocities
of different particle sizes.
More Information
For more information
about the IIHR sediment laboratory, please contact
Dr.
Thanos Papanicolaou. |
