How does a snow fence work?

You've probably seen these orange fences here and there this winter. What do they do and how do they work?

How to Install a Snow Fence (with Pictures) - wikiHow

Snow Fences? Tips and Tricks!

The science behind snow fences - Manitoba Co-operator

Wooden Snow Fence - Discount Fence Supply, Inc.

Snow Control, Snow Fence Manufacturer

Snow Fence: What Is It, How to Utilize It, and How to Build It

Episode #575: How Do Snow Fences Work? – The WeatherJazz® Podcast

Snow Fence Installation Instructions

Basics of Blizzards and Snowdrift Control - Basics of Snowdrift Control - Snow Fence Equilibrium Drifts

NCR-191