合肥市短历时暴雨强度变化及雨型推求  

Study on the variation of short-duration rainfall intensity and rainfall pattern in Hefei City

作　　者：沈捷 SHEN Jie(Anhui Hefei Hydrology and Water Resources Authority,Hefei 230041,China)

机构地区：[1]安徽省合肥水文水资源局,安徽合肥230041

出　　处：《江淮水利科技》2024年第5期31-36,I0002,共7页Jianghuai Water Resources Science and Technology

摘　　要：为了揭示合肥市区短历时暴雨强度变化规律,比较不同时期推求的暴雨强度公式在设计暴雨量和设计暴雨过程方面的差别,基于国家基本水文站董铺站1965—2020年分钟雨量资料,采用年最大值法选取暴雨样本,同时选取合肥市4个不同时期的暴雨强度公式分析各历时和各重现期下的设计暴雨量,采用芝加哥雨型对设计暴雨量进行时程分配。结果表明:1)1991年以后合肥市45~180 min历时暴雨强度明显增大;2)不同公式推求的不同历时各重现期下暴雨强度差异显著,特别是近10年高重现期的暴雨强度增大趋势较明显;3)基于芝加哥雨型的180 min设计暴雨雨强峰值位于70 min左右。合肥市暴雨强度整体呈逐渐增强趋势,建议每隔10年或当暴雨强度变化率超过5%时对暴雨强度公式进行修订。基于芝加哥雨型推求的设计暴雨过程可为合肥市城市排水系统设计和城市防洪除涝规划提供参考。The objective of this study is to reveal the variation law of short-duration rainstorm intensity in Hefei City,and to compare the differences in the design rainstorm amount and design rainstorm process of the rainstorm intensity formula derived from the rainstorm data in different periods.Based on the minute-by-minute rainfall data of Dongpu station of the national basic hydrological station from 1965—2020,the annual maximum value method was used to select rainstorm samples,comparing the design rainfall of each duration and each return period calculated according to the rainstorm intensity formula of four different periods in Hefei;the Chicago rainfall pattern was used for temporal allocation of the design rainfall.The result showed that:1)After 1991,the intensity of 45~180 min rainstorm in Hefei had increased significantly.2)The results of rainstorm intensity in different periods and durations by different formulas were significantly different.Especially in the past 10 years,the tendency of increasing at the beginning and decreasing in late was obvious.3)The design rainstorm process peak of the Chicago rainfall pattern was about 70 min.The overall rainstorm intensity in Hefei showed a gradual increasing tendency.The design rainstorm process based on the Chicago rainfall pattern derivation can provide the design storm process for the design of urban drainage system and urban flood control and elimating flood planning in Hefei City.

关 键 词：短历时暴雨 暴雨强度 雨型 合肥市 

分 类 号：TV122.1[水利工程—水文学及水资源]