辽宁省近70年短历时暴雨时空变化及气象成因分析

Temporal and spatial changes and meteorological causes of short-duration rainstorm in Liaoningin recent 70 years

本文基于辽宁省近70年完整、可靠的544个站点暴雨资料,选取暴雨中心雨量高于200mm、降雨间隔时段低于6h的162场典型暴雨,对辽宁省短历时暴雨时空变化特征及气象成因进行了分析。结果表明:东南和西南季风相互作用是辽宁省区域大暴雨主要影响天气系统;短历时暴雨主要集中在12h以内,12h降雨量占总雨量的72%,最大24h暴雨多在120~600mm之间;暴雨空间分布从东南向西北逐步递减,暴雨中心主要分布在东部山区、中部平原及西部沿海区域。该研究成果对于辽宁省防洪治涝总体部署具有重要意义。

Based on the complete and reliable rainstorm data of 544 stations in Liaoning in recent 70 years,this paper selects 162 typical rainstorms with rainfall over 200mm in the rainstorm center and rainfall interval less than 6h,and analyzes the temporal and spatial variation characteristics and meteorological causes of short-duration rainstorms in Liaoning.The results show that the interaction between southeast and southwest monsoon is the main weather system affected by regional heavy rain in Liaoning;Short-duration rainstorms are mainly concentrated within 12 hours,with 12 hours rainfall accounting for 72%of the total rainfall,and the maximum 24 hours rainstorms are mostly between 120 and 600 mm;The spatial distribution of rainstorm gradually decreases from east-south to west-north,and rainstorm centers are mainly distributed in eastern mountainous areas,central plains and western coastal areas.The research results are of great significance to the overall deployment of flood control and waterlogging control in Liaoning.