Identification and Determination of Inconsistent Rainfall in Water Source Areas of Cixi City based on K-S Test

Abstract

Cixi City is located on the south bank of Hangzhou Bay in eastern Zhejiang Province. It is a severely water scarce area with a per capita water resource share of only 445 cubic meters, which is only one-third, quarter, and one-fifth of the per capita share of Ningbo City, Zhejiang Province, and the whole country. With the continuous growth of population and rapid economic and social development, the supply-demand contradiction of water resources in Cixi City will become increasingly prominent. Precipitation forecast is a prerequisite for water resource planning and management in Cixi City. Currently, water resource planning and management are based on historical hydrological data. Therefore, the accuracy of hydrological data is of great significance for water resource planning. In order to determine whether the rainfall data sequence is stable and whether its development pattern is consistent, K-S test was introduced to test the rainfall sequence in this study. By testing, it was found whether there was inconsistency in rainfall and when it occurred, in order to provide better reference for future water resource management. The rainfall in the water source area of Cixi City has undergone inconsistent changes, with the change occurring in 1965.