The sky was cloudless and the sun shone brightly, its light sparking on the water's surface like solar flotsam.
What does solar flotsam means??
As I know, solar means the sun and flotsam is something that floats on the water.
But I don't think it means the sun float on the water. Does it mean the reflect of the sun on the water surface?
Yes — the reflection of the sun on the water.