I have sort of covered bits of my layouts where there is high scenic detail specially buildings constructed from wood.
In one area is behind bushes and accessed through a gate that matches he other side of an arbour leading to the decking. I constructed a flat roof (made from corrugated clear plastic sheet on a 4'x8' pressure treated trellis) on stilts with camouflaged wooden uprights and 6ft high bark roll as a background to which I affixed a photo background.
It has a rolled up tarpaulin at the front to drop down for when the weather is going to be really bad or when we are away from home for extended periods. This has kept everything nice and dry and protected from most garden leaf litter....but not from spiders who think that it is paradise!
Another area is totally under a bush which is under a fir tree that sheds very painful 2-3 inch needles. I 'wove' a camouflage PVC tarpaulin, cut to suit, into the branches of the bush and the tree to keep the needles and the rain off as there are many wooden buildings there.
The camouflage tarpaulin is very hard to see in the bush/tree unless you are really looking for it and has really done the task well, even when the storms have hit us, it only needed small repairs to a couple of the wire securing tags.
I have used the tarpaulin system in another place to the same effect.
One other system that I have employed where rain is not the problem, but falling leaves are, as there are two deciduous trees right above that area of the layout, is by using green house mesh attached across an area using garden-wire 'cables'. The mesh was sprayed with some brown and different green to 'camouflage' it and the wires are also 'camouflaged' and mainly hidden by the foliage behind, above and to the side of the mesh.
It is not very obvious to the casual glance and blends in well with the non deciduous foliage around it.
This has worked really well and allows me to take all the fallen leaves off of the mesh in one or two hits during the year and keeps the track and scenery below, pretty well leaf and twig free.
This shows where the Arrowhead 'roof on stilts' is situated behind
Arrowhead with the bark roll and background
The tarpaulin covers are woven into the fabric of the bush and tree branches to the left of the arbour.
The mesh over the spiral to keep the birch and elder leaves off (and the leylandii hedge trimmings!). It can be seen above the bridge.
