Based on the monthly rainfall data of 629 meteorological stations in China from 1950 to 2000, the waterlogging scope in the region from Qinling Mountain and Huaihe river to the South China is calculated with Z-index as the standard to determine drought and waterlogging, the laws of waterlogging’s occurrence and development in the south of China are analysed.

Using EC numerical forecasting data,we analyzed the tropical cyclones that affected Guangxi,induced and reorganized the weather types influencing wide range rainstorm and found out the correlating meteorological elements and predicting factors.

Through the field investigation,the paper comparative analysis is made on the influence of waterlogging in different phases to cotton growth and production from 2004 to 2006,and gives corresponding strategies to resist or decrease damage.

Trend Analysis of Drought and Waterlogging in Kaifeng Based on Gray Catastrophe Theory

Through classification of 46 times heavy rain occurred in Yunnan province during the period of 1980_1990, it is found that the main impact systems of Yunnan rainstorm were resulted using the reanalysis data of NCEP/NCAR from 1989_1991, we discussed 11 times province wide cold front-shear line type rainstorm cases which most occurred in Yunnan by means of composite analysis.

In this paper, 16 torrential rain and flood processes from June to September (1966 - 1995) were analyzed and similar weather situations were summarized.