1, 1, the Indian peninsula is affected by the southwest monsoon. The southwest monsoon comes from the ocean, with a lot of water vapor and precipitation.

2. The uplift of the West Kochi Mountains. On the windward slope of the southwest monsoon, due to the uplift of the mountains, the southwest airflow rises, causing cloud rain and heavy precipitation. These are the reasons that lead to the erosion of flowing water in the western mountainous areas of Gaozhi.