Hello and good day Ken Turner. Thank you for posting. Please try to post the video you have created from Lake Pukaki, New Zealand for us to view. Thank you for your support.
The glacial feed to the lakes gives them a distinctive blue colour, created by glacial flour, the extremely finely ground rock particles from the glaciers.
The glacial feed to the lakes gives them a distinctive blue colour, created by glacial flour, the extremely finely ground rock particles from the glaciers.