Energy driving mechanism of natural and social hydrology cycle and its comprehensive evaluation

In order to reveal the dynamic mechanism of the evolution of natural and social hydrology cycle, the quantitative relationship between energy input and hydrology circulation flux was studied based on the analysis of energy consumption process of natural and social hydrology cycle. On the basis of analyzing the physical foundation, scientific connotation and driving process of energy-driven hydrology cycle, an evaluation method for natural hydrology cycle driving energy and social hydrology cycle driving energy was proposed, and applied in 10 first-level basins nationwide in China, including the Haihe River Basin. The research results indicate that phase change and displacement are the essence of hydrology cycle movement, and different energies have consistency in the driving mode of water cycle. The driving energy ratio of social hydrology cycle to natural hydrology cycle can reflect the degree of human interference to the hydrology cycle in the watershed. The average driving energy ratio of social hydrology cycle to natural hydrology cycle in the Haihe River Basin from 1980 to 2020 was 0.21. In 2020, the driving energy ratio of social hydrology cycle to natural hydrology cycle in the Haihe River Basin was the highest at 0.19, while the ratio of southwest river basin was the lowest at 0.02. Excessive input of artificial energy accelerates the hydrology cycle, which is the main reason for the imbalance of social water system, and regulating the input energy of social hydrology cycle is the key to maintain a healthy hydrology cycle.