Development of a simple current meter using solution
1992
Kawamata, S. (National Research Inst. of Fisheries Engineering, Hasaki, Ibaraki (Japan))
A simple method of measuring average water velocity was invented for the field survey of water motion affecting benthic organisms. The essence of the devices used for this method is composed of a vertical thin pipe, an upper chamber filled up with the neutrally buoyant solution of a substance, and a lower chamber packed with porous media to take in ambient water little variation of water pressure. When this device is set on the flow bed, the solution in the upper chamber is diluted because the solution is polled out of the pipe by the moving ambient water while the fresh ambient water comes though the lower chamber. An obtained formula of determining the average water velocity during a measurement needs only to measure the initial and last concentrations of the solute in the upper chamber. Furthermore, experiments using models of this device were conducted to prove the feasibility of this idea. It was showed that the method would be practicable but needed some more improvements, especially enhancement of mixing water in the upper chamber
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