That's not a channel...
It may look like one in the small image but the full image and the context photo show it's one of numerous giant polygonal cracks.
All of the local craters (in the large image) have got the same "sunburst" pattern of internal rays and a mound at one end - probably permafrost related. The other craters don't connect to a crack in the same way, so their internal structure can't be related to flow in "channels" If they aren't then the first one you showed probably isn't too.
Always look at the context and think about processes before leaping to conclusions...