To be scattered about in disorder; to lie scattered (often used for petals, papers, debris, etc.).
強い風で桜の花びらが庭中に散り乱れている。
Strong winds have scattered cherry petals all over the garden.
書類が机の上に散り乱れていて、仕事がしにくい。
Papers are scattered across the desk, making it hard to work.
台風の後、街には破片が散り乱れていた。
After the typhoon, debris was scattered throughout the town.