Well I have tried to find a filter for photoshop that could make this effect but I have had no luck.
All I can do is "jack around" with the Image Adjustments until I got near to the right effect. No; I guess it isn't really fire as in flames, but it does look like oil that is on fire, in the water drop photo, or lava maybe, the splash in the first photo makes it look like an explosion at least.
I tried another photo to try out some filters and I think it looks better if you don't mask the canoeist, that way we get the feeling of heat and light around them. Definitely choosing the right water splash will improve the effect, not so many big round droplets looks