Enable particle when player enters trigger

I've been working on a simple project for hours and lately I've managed to finish my terrain design. Shortly, I've added a small river to make it more "natural" but there's one thing that I wanted to add: Enabling a water particle effect when my player runs/walks in the river.

Here's a screenshot of my river:

Here's how my particle effects looks:

If you guys have good ideas to solve this, please post an answer below! I would appreciate it :)

Thanks!