I just wonder why grass is needed? Remove said grass, and tips, paint the areas where the grass were green, and that should move a great deal of the birds away.
Is there a reason why this isnt happening?
Small seed eating birds like long grass to hide and feed in.
Big birds like short grass to lounge in.
Gulls seem to like open spaces that catch water in puddles and where they can watch for predators between commutes to feedings. Fool with mother nature and she will fill the void with something worse.