The influence of water temperature on the velocity of propeller - type current meter revolution

Niemiec, Łukasz; Starý, Miloš

doi:10.2478/v10098-010-0025-x

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in our opinion, using only one current meter and a quite limited amount of measurements do not allow a precise quantification. Niemiec and Starý (2010) carried out similar research with three current meters (two Ott C-2 with together 5 propellers and one Ott C-31) with water temperature varying from 2ºC to 23ºC. Their results are quite consistent, but again the total amount of current meters used was small.…”

Section: Introductionmentioning

confidence: 90%

Influence of Water Temperature on Results of Current Meter Calibration and Measurement

Mattas¹,

Ramešová²

2013

Journal of Hydrology and Hydromechanics

View full text Add to dashboard Cite

On the basis of the results of calibration of current meters at water of varying temperatures, a hypothesis that water temperature influences measured water velocities was formulated. The analysis of our long-term data showed that the water temperature does have an influence on measured water velocity. This influence can be taken into account for practical purposes as a contribution to the uncertainty of measurements. The influence depends on the type of current meter propeller. This paper presents results obtained for the Ott C-2 current meter with propellers of the types 1, 2, 3, 5 and 6. Our analysis showed that the uncertainty is equal or less than 5% for measurements carried out in water with temperatures above 8°C. The differences between measured water velocities for water temperatures 5°C and 20°C reached maximum 6% (depending on the propeller) in a slowly flowing water (rotational frequency n = 1 s -1 ). For rotational velocity n ≥ 2 s -1 the differences between velocities measured at water temperatures 5 and 20°C were mostly under 3%. The less influenced propeller is of type 3 for which the uncertainty of measurement does not reach 5% even for water temperature 1ºC if the rotational frequency is bigger than 0.7 s -1 .

show abstract

Section: Introductionmentioning

confidence: 90%