Planting the sides of the trench would break up the wind considerably, its actually better than a wall where the wind would eddy over and into the trench.
If it ends up being near a major stream/wetland you could even try getting some funding from Regional Council as you would be enhancing their waterways and/or creating a green corridor.
Seriously though, if you get to the stage of building the thing, flick me a PM if you want some guidance regarding plant species, spacings, etc, I think I can help you out there.
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