A STUDY ON THE FEATURE OF PRECIPITATION CONCENTRATION AND ITS RELATION TO FLOOD-PRODUCING IN THE YANGTZE RIVER VALLEY OF CHINA
长江流域汛期降水集中程度和洪涝关系研究

Based on the precipitation-concentration degree (PCD) and precipitation-concentration period (PCP), we analyze the characteristics of spatial and temporal distribution and variation of precipitation in the Yangtze River Valley. It is proved that these two parameters can display the temporal inhomogeneity in the precipitation field, and pick up the corresponding period of the largest precipitation amount in theoretical analyses of floods and droughts in the Yangtze River Valley. Thus the basic characteristics and mechanism of flood and drought can be fairly analyzed. And it is also found that there is a good relationship between the precipitation-concentration degree and the East Asian monsoon index in the middle and lower reaches of the Yangtze River.