I’m wondering if you could set up an array of motion sensors pointed at the sky to avoid false triggers. You could have them set up to some cheap loud radios or something. The whole thing could run off of a car battery.
Edit: How about motion activated water sprinklers like this?
https://www.amazon.com/gp/aw/d/B009F1R0GC/ref=pd_aw_sbs_86_1?ie=UTF8&psc=1&refRID=RKRT1AJT7T34MM1VBQ99&dpPl=1&dpID=51lzS9UvYdL
It looks like you can set up an array of them to run off of one sensor so you can blast a large area.
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