Study on the variation characteristics of rainstorms and the return period of precipitation extremes in Hezhou City
Based on the daily rainfall data from 132 stations in Hezhou City,the spatial and temporal characteristics of rainstorms and the distribution of rainfall extremes in different return periods were analysed by ArcGIS and MuDFiT.The results show that:(1)the distribution of the maximum value area of average annual number of rainstorm days and the average annual number of heavy precipitation days in Hezhou corresponds well to the windward slope and the place with sufficient water vapor.(2)The number of rainstorm days and heavy precipitation days in Zhaoping are higher than the other counties of Hezhou City,with relatively more days in May and June.(3)By fitting,the daily rainfall for the 100-year return period under the optimal function is found to be 315.6 mm in Zhaoping,257.5 mm in Fuchuan,228.2 mm in Zhongshan,and 248.1 mm in Hezhou,with its optimal function being Gen.Extreme Value.
rainstorm characteristicsreturn periodoptimal function
万方数据
维普
