llama66 llama66:
is it possible to build a bridged highway or causeway (like they have in Louisiana over the bayou) over the permafrost? or is that impossible? it may be fiscally impractical, I dunno. ziggy, you seem to spend a fair amount of time up there what do you think?
hey,you mean the Hudsons bay?
North of Churchill the top meter of dirt is about the most that will get soft in summer and that depends on what kind of grass is on top of it.Some are better insulators then others but basically the ground never thaws unless you disturb it.
The last thing you want to do is take any grass off the soil because just the dark color of the dirt will get it warm enough to start it melting.Because it cant soak into the ground it flows and melts more frozen ground.
Good example of this was when we were asked to skid a blasting shack a mile over the tundra,the boss was green and insisted we do it.Well by lunch time the skid marks were black,wet,and there was small creeks flowing down them to the lake and silting it up.Those tracks will be there a thousand years and will eventually become creeks.
so it's a very fragile environment that way but building roads is easy as you just want to cover the ground with your road and its done.Most of Nunavut where I work is only 10 or 20 feet above sea level so your talking about the worlds largest body of fresh water.Roads have to snake all around these lakes,thats why it's easier to fly,and cheaper.
Or build ice roads and doing one over hudson bay would be brutal with the pressure ridges.
The boggy stuff your probably talking about would me more in Manitoba and Sheps more familiar with that area as i just stop there to change planes.
North of churchill you can fly for many hours without seeing anything but white the majority of the time,no life anywhere and its the same all the way to Yellowknife.
You have to fly over it to appreciate how freaking big and desolate it is.
The people who live there and explored there are a different breed.
The 100 mile nuna road I was at had to cross many rivers so we used a type of portable bailey bridge and made them permanent.This all season road is now what they use to get supplies in to the mine from Baker lake where its barged in the year before.
When we didnt have the road it was heli and ice road,the ice road was 30 miles to town so thats how much water you have to drive around.Check out my youtube vids for a helicopters view of some of it.