Synaesthesia and metaphor
2. Are these two meanings contradictory? What's the beauty of this writing?
Not contradictory. In the last two sentences, the author did not say that he would go to the riverside to enjoy flowers, but that he forgot to think about flying flowers, which made the poem implicit and changed. At this time, he wrote about the homesickness and sadness caused by sailing on the river and encountering strong winds on the way.