The "channels" have very prominent ridges beside them, especially at the ?downhill? end. It could be that these are plough marks where a boulder has slid downhill and pushed a trail through the dust. Some of them have a sort of skipping pattern near the end.

Unfortunately, I don't see any boulders :-(

So this leads me back to Arthur Conan Doyle and one of the mysteries of Sherlock Holmes where a man was shot but no bullet was found - because the murderer used a bullet made of ice (it might even have been dry ice!). So I could postulate that in the spring thaw, an overhang of ice broke up and pieces slid downhill, carving the tracks.

I wonder if the image is far enough south to have seasonal ice? (It looks like a southern hemisphere terrain).