Windbreaks, and wind turbines.
Per the US Department of Energy, a good windbreak can reduce windspeed for a distance of around 30 x the windbreak's height. A 30-metre high windbreak would be needed to protect 1 km of space. That's a decent height to build, but it's not impossible.
Construction methods will vary depending on conditions and available materials. It could be as simple as an earthen bank - you could make it even more efficient by digging soil from the field you want to protect, reducing its height, and using that to build your windbreak. If you're worried about erosion, flood waters, etc, you would build around a central core of steel pilings driven into the soil, surrounded with gravel and/or concrete, then pile the soil around that.
You would then line the windward side of your bank with wind turbines for power generation. Exactly how the turbines would affect the wind flow is not currently clear - it's an area of active research - but in 25 years, and with a lab as effective as this colony, we can be reasonably sure the engineeers would be able to place them efficiently.
And, nitpick - the engineers are a corps, not a core. It's pronounced the same, but has a very different meaning.