Start shooting out there, spend a lot of time out there, take dogs out, ride your horses, etc. You want them to realize that it's not a good nesting or feeding area. Harass the crap out of them until they figure it out.
We have some at our pond near the barn. They don't bother us but they eat the garden like CRAZY! We started shooting them before they can nest. I hate having to do that.. but my garden is very important.
I would not mind sharing a small amout and do, to the beavers coming out of the pond eating corn and the chickens pecking the tomatoes but the geese really CLEANED us out a few years ago.. so we have started killing them when they first come around. Now, there is a pair that fly around to several of the ponds in the area but they don't stay for long on ours near the garden. That is all I wanted.
The park close to where I keep Oscar has wooden cut-outs of running coyotes placed all over the park and amazing enough, it works!! They gather the wooden 'yotes during the weekend when there are soccer games and stuff and the geese immediately show back up.
When we lost that yearling, I talked to the local Sheriff and told him what was going on. He said you just need to do what you need to do to protect your stock. He said with all of the problems people have with geese, he did not see a problem getting rid of the ones that were causing trouble. Kind of like shooting the feral hogs before they put a year 'round season on them. I have not heard of anyone around here getting in trouble for getting rid of the nasty geese.
Check your local laws before you shoot, in some areas they are protected.-
They can do devastating damage to new crops just emerging, and new grass as well. We had a local farmer get a hefty fine for harming a goose, even though the geese were damaging his crops. He took his pickup truck and drove into the flock, killing 1 I believe. A nosy neighbor reported him, and he had to pay.