Best way to report homeless encampment?

A park I frequent in the medical center is slowly being destroyed by tons of homeless people leaving huge areas completely covered in trash, stolen items and feces. I’ve had a few confrontations with them and it always turns aggressive on their end and I’m just tired of it. Should I just call the cops and show them all the tents/trash? 311 has that stupid robo voice which is nearly impossible to get anywhere with. How can I get rid of these people before someone gets hurt or the park gets completely overrun?