Abstract
The Dadu River Basin is located in the transitional zone between the Qinghai-Tibet Plateau and the Sichuan Basin. It is alternately affected by various weather systems such as the western Pacific subtropical high, the Qinghai-Tibet high (anti-cyclone), the southwest warm and humid air current, and the southeast monsoon. The western Pacific subtropical high is one of the main influencing factors of rainfall runoff in the basin. During the El Niño period, the western Pacific subtropical high moved eastward and the position was southward. The warm and humid airflow and the southeast monsoon northward changed, and the rainfall runoff in the Dadu River Basin changed.By analyzing the development of the El Niño phenomenon, Divide an El Niño process into different stages of occurrence, development, and end. Combining the characteristics of the Dadu River runoff in each stage, Studying the runoff situation of the Dadu River Basin under different strengths and weaknesses of the El Niño phenomenon. Using the correlation method to establish a model of the relationship between the abundance of the Dadu River Basin and the El Niño strength and weakness. Providing new ideas and new methods for the accurate prediction of the incoming water of the Dadu River under the abnormal climatic conditions of El Niño. It provides technical support for reservoir dispatching, flood control dispatching and economic dispatching of cascade hydropower stations, and provides experience for other river basins to cope with complex climate situations and improve water regime forecasting levels.
Highlights
El Niño is an important climate anomaly
In the 1970s, as climatologists continued to study the El Niño phenomenon deeoly, it was found that every time the El Niño phenomenon occurred, a series of significant changes will occur in the global climate 。 the El Niño phenomenon has become a research hotspot in the climate and related fields, as well as an important basis for researching, exploring and predicting global climate change
2.2 Analysis of the Mechanism of the Influence of El Niño in the Dadu River Basin The Dadu River Basin is affected by the alternating effects of the western Pacific subtropical high, the Qinghai-Tibet Plateau high-pressure, the southwest warm and humid air current, and the southeast monsoon
Summary
El Niño is an important climate anomaly. Its name originated in Spanish and originally referred to the abnormal warming of cold currents on the west coast of South America around Christmas[1]. 2.2 Analysis of the Mechanism of the Influence of El Niño in the Dadu River Basin The Dadu River Basin is affected by the alternating effects of the western Pacific subtropical high, the Qinghai-Tibet Plateau high-pressure (anti-cyclonic), the southwest warm and humid air current, and the southeast monsoon. The western Pacific subtropical high is one of the main influencing factors of rainfall runoff in the Dadu River Basin[3]. The warm and humid air currents of the Indian Ocean from the Indian Ocean and the Bay of Bengal and the monsoon from the South China Sea pass through the Dadu River Basin from south to north, and rise and cool after encountering the mountain plateau, forming rainfall runoff. The warm and humid airflow and the southeast monsoon northward path were Different from normal year.This change causes rainfall runoff in the Dadu River Basin changed, which was the main mechanism of El Niño's influence on the Dadu River runoff[4]
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