Analysis on annual rainfall’s cycle and trend of Caoejiang sluice

Abstract

Caoe River sluice project is located at the Caoe River Estuary on the South Bank of Jianshan River Bay of Qiantang River. The project has comprehensive utilization of moisture-proof (flood), waterlogging control, water resources development and utilization, as well as improving water environment and shipping. The completion of the Cao’e River Sluice Project has improved the flood control capacity of the main stream of the Cao’e River (below the Shangpu sluice), the drainage capacity of the plain of the Cao’e River Basin, and the navigation guarantee rate of the Hangzhou Ningbo canal and the Cao’e River section of the Hangzhou Ningbo canal. The regulation of Cao’e River sluice has an important impact on the above functions. The regulation of Cao’e River Sluice depends on the accurate analysis of rainfall. Therefore, this paper analyzes the rainfall in the area where the Cao’e River sluice is located, and finds that it has a long period of 34 years and a small period of 20 years, and will be in a dry period in the next few years.