江苏苏州市市区短历时暴雨雨型研究分析  

Analysis on temporal distribution of short-duration rainstorm in Suzhou City,Jiangsu Province

作　　者：孙伟 沈建[1] 蒋小欣[2] 顾明 王伟杰[2] 徐鑫 SUN Wei;SHEN Jian;JIANG Xiaoxin;GU Ming;WANG Weijie;XU Xin(Suzhou Meteorological Bureau,Jiangsu Province,Suzhou 215213;Suzhou Water conservancy Bureau,Jiangsu Province,Suzhou 215000)

机构地区：[1]江苏省苏州市气象局,苏州215213 [2]江苏省苏州市水利局,苏州215000

出　　处：《中国防汛抗旱》2019年第9期18-23,共6页China Flood & Drought Management

基　　金：江苏省气象科学研究所北极阁基金——南京大气科学联合研究中心基金（BJG201410）;江苏省气象局重点项目（KZ201806）

摘　　要：采用苏州市国家基本气象站及苏州中环内的5个加密观测站2005—2017年共13年的逐分钟降雨过程资料,利用PC(Pilgrim&Cordery)雨型方法和KC(Keifer&Chu)雨型方法推求苏州市区历时120min以5min为单位时段的设计短历时暴雨雨型。结果表明,利用PC法和KC法推求的苏州市区各降雨历时设计短历时暴雨雨型基本呈单峰型,120min雨型雨峰位置均处于降雨过程前部,雨峰系数为0.394,雨峰时段雨量占总雨量的19.37%。雨峰降雨强度随着历时的增加整体呈现减小—增大—减小的波动趋势。PC雨型方法和KC雨型方法推求苏州市短历时暴雨雨型具有“单峰型、时间短、强度大”的特点。因此,当短历时暴雨发生时,水利、气象等相关部门应积极配合,在第一时间做好城市排水防涝工作。Based on the minute-by-minute rainfall process data of the national basic meteorological station of Su.zhou and five encrypted observatories in the central district of Suzhou from 2005 to 2017,this paper uses PC(Pil.grim&Cordery)and KC(Keifer&Chu)rainstorm distribution methods to calculate the design short-duration rain.storm distribution of the time period of 120 min with 5 min per unit period.The results show that the rainfall distri.bution of short-duration rainstorms in Suzhou City,are basically single peak,and the location of 120 min rain peak is in the front of the rainfall process,the coefficient of rain peak is 0.394,and the rainfall is 19.37%of the to.tal rainfall.The rainfall intensity of rain peak shows a trend of decreasing-increasing-decreasing with the in.crease of duration.The characteristic of short-duration rainstorm distribution is"single peak shape,short-dura.tion and high intensity”.

关 键 词：短历时暴雨雨型 PC(Pilgrim&Cordery)雨型方法 降水历时 苏州市 

分 类 号：TV122.1[水利工程—水文学及水资源]