四川省降水事件的日内变化规律研究  

Diurnal Patterns of Precipitation Events in Sichuan Province

作　　者：唐澜瑜 张文江[1] 覃光华[1] 黎小东[1] TANG Lan-yu;ZHANG Wen-jiang;QIN Guang-hua;LI Xiao-dong(College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学水利水电学院,四川成都610065

出　　处：《水电能源科学》2024年第12期14-18,共5页Water Resources and Power

基　　金：国家自然科学基金项目(41771112);四川省区域创新合作项目(2022YFQ0028)。

摘　　要：强降水是四川省山洪的重要诱因,评估其日内变化规律可为山洪灾害防御提供支撑。基于6725个站点的小时降水资料,采用空间分区、时间分段等方法,研究了四川省降水事件的日内变化规律及空间特征。结果表明,四川省总体降水日内分布,可分为夜晚型(盆周山地及川西)、凌晨型(川南和攀西)和昼间型(川北);短历时降水事件频繁,1~3 h降水多现于凌晨和下午,强度较大,而历时>3 h降水则以凌晨偏多;降水事件峰现以凌晨占比最大(>62%),常在5 h内出现峰值;降水事件开始时刻随海拔升高而提前。研究揭示了四川盆地周边山前地带夜间降水频次高、强度大的特点,应高度重视该地带夜间强降水事件诱发山洪灾害的风险。Heavy precipitation is an important trigger for mountain floods in Sichuan Province,and its diurnal variation characteristics are the scientific support for mountain flood disaster defense.Based on the hourly precipitation data of 6725 stations,spatial zoning and time segmentation were used to study the diurnal variation and spatial characteristics of precipitation in Sichuan Province.The overall precipitation distribution in Sichuan Province can be divided into three types:nighttime(western mountains),early morning(south Sichuan),and daytime(north Sichuan).Short-duration precipitation events are frequent,and 1-3 h precipitation occurs mostly in the early morning and afternoon.However,long-duration(>3 h)precipitation occurs more in the early morning.The peaks of precipitation events are mostly present in the early morning(>62%),and the peak of the precipitation in the early morning often appears within 5 hours.The start time of the precipitation events advances with the increase of altitude.This study indicates that the mountains a-round the Sichuan Basin have frequent and intense precipitation at night,and the risk of mountain flood disasters caused by strong nighttime precipitation events should be carefully accounted.

关 键 词：水文气象 降水事件 日内变化 夜雨 暴雨山洪 四川省 

分 类 号：TV125[水利工程—水文学及水资源] P33[天文地球—水文科学] P426.614[天文地球—地球物理学]