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Analyzing thermal images of water in motion
02-20-2016, 11:09 AM (This post was last modified: 02-21-2016 04:46 PM by SuneN.)
Post: #1
Analyzing thermal images of water in motion

I am doing a project with the Danish Enviromental Authority. We are looking for temperature signatures from polluted groundwater, entering the riverbed. The water in the river is 0-1C, and the entering polluted ground water is 8-10C.

We are trying to determine if thermography can be used as a tool to located the sections of the riverbed, where the infiltration is occurring.

We are using a FLIR Tau2 336 sensor, attached to a DJI S1000 for the field work. When gathering data, we fly 3 m/s at different heights, following the current.

My question is this:

Why does the area of the water surface, in the top of the image, appear warmer than the water surface near the bottom of the image? The problem persists when moving along the flow in the stream.

Here is a short video showing the problem when moving along the current:


(Could not uploade the .avi file)

The second time we flew, we tried hovering above certain locations of the river. It then seems as if the water closest to the center of the image is hotter than the water close to the perimeter of the image.

Here is a video of the hover state:


Any input would be appreciated. If please request all settings that could be relevant for solving the issue.

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Analyzing thermal images of water in motion - SuneN - 02-20-2016 11:09 AM

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