Extreme rainfall forecasting based on wavelet analysis and M-K test

Abstract

In recent years, many places in China have encountered extremely rare heavy rainfall weather, and the north has also encountered rare blizzard weather, which poses a serious threat to the personal and property safety of local people. On July 20th, 2021 , with the maximum hourly rainfall reaching 201.9 mm, Zhengzhou suffered the extremely heavy rainfall once in a thousand years. The 7.20 heavy rain in Zhengzhou caused many communities and roads in Zhengzhou to be flooded by the rain and thus drew attention to and recognized the extraordinary precipitation. In this paper, a correlation analysis is made on the interannual variation of precipitation characteristics in Zhengzhou area, and concrete quantitative analysis is made on flood events; In addition, the characteristics and losses of precipitation in Shaanxi and Zhengzhou are compared Finally, put forward the long-term planning and construction of cities under the condition of extreme heavy rainfall in the future.