摘要
为研究陇东局地地形对庆阳暴雨的影响,利用2013-2020年汛期庆阳市206个气象站点的日降水资料及地面填图资料,对暴雨的时空特征进行分析,重点针对局地地形对暴雨的影响进行研究。结果表明:2013-2020年暴雨频次呈波动状增加趋势,主要集中在7月下旬及8月上旬;暴雨出现频次多、降水极值较大的区域均出现在庆阳市中部;陇东局地地形对暴雨影响效应主要有地形坡强迫抬升,“喇叭口”地形、川道地形的辐合作用等,庆阳市产生的极端强降水均受多种地形效应共同影响;冷槽东移型暴雨主要受地形梁、沟及河流的作用及子午岭西坡地形坡抬升及阻挡作用;偏南型暴雨主要受地形沟、“喇叭口”地形的辐合及子午岭地形迎风坡的强迫抬升效应。
In order to study the influence of local topography in Eastern Gansu on rainstorm in Qingyang,the daily precipitation data and ground mapping data of 206 meteorological stations in Qingyang city during the flood season from2013 to 2020 were used to analyze the spatial and temporal characteristics of rainstorm,which emphasised on the influence of local topography on the rainstorm.The results are as follows:The frequency of rainstorm from 2013 to 2020showed a fluctuating increasing trend,which is mainly occurred in late July and early August.The areas withhigh rainstorm frequency and high precipitation extreme value are in the central part of Qingyang.Forced uplift of topographic slope,"bell mouth"topography,convergence of Chuandao area and river effects were the factors that influence the rainstorm by the local topography of Longdong.The extremely heavy rainfall in Qingyang City was affected by multiple topographic effects.The type of cold trough eastward-moving rainstorm was mainly affected by the action of topographic beams,gullies and rivers,and the topographical slope uplift and blocking of the western slope of Ziwuling mountain.The southerly airflow rainstorm was mainly affected by the convergence of the topographic gullies,the convergence of the"bell mouth"topography and the forced uplifting effect of the windward slope of the Ziwuling topography.
作者
赵玉娟
张洪芬
张可心
柳东慧
ZHAO Yujuan;ZHANG Hongfen;ZHANG Kexin;LIU Donghui(Qingyang Meteorological Bureau of Gansu Province,Qingyang 745000,China)
出处
《成都信息工程大学学报》
2022年第6期709-715,共7页
Journal of Chengdu University of Information Technology
基金
甘肃省气象局气象科研资助项目(Ms2022-09)
甘肃省气象局气象科技资助项目(人才专项)(2122rczx-青年优秀科技人才-04)
关键词
气象学
灾害性天气
暴雨
陇东
局地地形
meteorology
disastrous weather
rainstorm
eastern Gansu province
local topography
