Talk about the relationship between rainfall and geological disasters in Yang Shan county, and analyze the causes of large-scale geological disasters.

The relationship between rainfall and geological disasters in Shanyang county: there is a positive correlation between rainfall and geological disasters. There is much precipitation in summer and autumn in Shanyang County, and geological disasters occur frequently.

The reasons for the frequent occurrence of geological disasters in Shanyang County are as follows: Shanyang County is located in Qinling Mountains, and the terrain fluctuates greatly; The geological conditions are complex, and there are many loose clastic materials in mountainous areas; It belongs to subtropical monsoon climate, with heavy rainfall in summer and autumn. Vegetation in some areas has been seriously damaged.

Shanyang County is located in Shangluo City, Shaanxi Province, in the southeast of Shaanxi Province, at the southern foot of Qinling Mountain and in the south of Shangluo City. Because there is Liu Ling in the north, Maoling in the middle and Yunling in the south, it is called "Three Mountains and Two Rivers". Yang Shan belongs to the semi-humid mountain climate with monsoon, which is the transition from north subtropical zone to warm temperate zone. The climate is mild and the four seasons are distinct. "Winter is not cold, summer is not cool, spring is warm and windy, and autumn is wet and rainy." The average temperature is 13. 1℃, the average sunshine hours are 2 134 hours, the average annual rainfall is 709 mm, and the frost-free period is 207 days. It is very hot in summer and very low in some places in winter. Influenced by the Qinling Mountains, the climate is warm in the south and cold in the north.