Risk Assessment of Soil Salinization Induced by Water Resources Development and Utilization in Hexi Corridor

Hexi Corridor is located in the northwest inland with dry climate,sparse rainfall and intense evaporation,and the unreasonable development and utilization of water resources leads to the serious soil salinization in this area. According to the natural disaster risk theory and the formation mechanism of soil salinization,the index system for risk assessment of soil salinization in Hexi Corridor is established,and the risk evaluation model is constructed by using entropy combination weight and weighted comprehensive evaluation. The danger,exposure and vulnerability of soil salinization induced by water resources development and utilization in Hexi Corridor are analyzed by GIS technology. On this basis,the risk evaluation and zoning of soil salinization are carried out. The results show that the degree of water resources development and utilization is closely related to the risk of soil salinization. High and very high risk areas are distributed in the middle and lower reaches of the plain areas,and the eastern part is more serious than the western part.