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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Consideration of far infrared cameras for measuring surface flow velocity in night time
Consideration of far infrared cameras for measuring surface flow velocity in night time
Large Scale Particle Image Velocimetry (LSPIV) method has shown a great deal of potentials to seamlessly measure
streamflow discharge particularly in flood. The LSPIV utilized a pair of consecutive images recorded from cameras to
estimate surface velocity. Its non-intrusive nature of measurements could be more advantageous especially in flood season
when other intrusive instrumentations became difficult to apply due to dangerous field conditions. However, low quality of
images usually recorded during night time affected the reliability of flow measurements using LSPIV, thus that this limitation
has blocked the LSPIV method to be adapted as real-time discharge measurement system for national monitoring agencies.
So far, extra light or near infrared camera have been attempted for resolving this issue, but the outputs were highly
dependent on field conditions due to illumination and lack of tracers, respectively, and thereby limited to consistently provide
reliable discharge measurements in night time. In this research, we adapted far infrared camera that provided remarkably
visible images even better in night time. Flow movements interestingly generated different water surface temperatures, and
they could be explicitly identified by far infrared cameras. The far infrared images obtained in a straight river channel during
night time were analyzed using conventional LSPIV method and the results were in comparison with velocity measurements
with respect to concurrent measurements by propeller meter. In addition, the results using normal and near infrared camera
were also compared to differentiate their performance regarded with far infrared camera. The comparison results indicated
that the velocity derived from LSPIV with far infrared camera matched well with those from propeller meter. Therefore, it can
be concluded that the capacity of LSPIV operation in night time were considerably enhanced when far infrared cameras
were used.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 20/08/2015
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