Question about Snow at Trail Summits
It struck me: Day after day, run after run, skiers make turns and with each turn, some snow is pushed downhill. After thousands of runs, why doesn't the snow surface at the top of the hill become thin or even uncovered. Now these days, one could hypothesize that groomers push the snow back or snow makers replenish it, but I don't remember this being a problem even in the pre-snowmaking days.
Can any of you explain this phenomenon or better yet, seen some mathematical analysis of it?