四川白鹤滩一次罕见秋冬10级偏南大风过程分析  

Diagnosis and Analysis of a Rare 10-level Southerly Windy Weather at Sichuan Baihetan Hydropower Station

作　　者：唐毓羚 TANG Yuling(Meteorological Bureau of Liangshan Prefecture,Xichang 615000,China)

机构地区：[1]凉山州气象局,四川西昌615000

出　　处：《成都信息工程大学学报》2023年第1期70-74,共5页Journal of Chengdu University of Information Technology

基　　金：中国科学院A类战略性先导科技专项资助项目(XDA23090103);中国气象局创新发展专项资助项目(CXFZ2021Z014)。

摘　　要：为进一步研究2020年11月17日发生在四川白鹤滩水电站的一次罕见偏南10级大风过程,利用白鹤滩坝区新田自动站逐小时气象要素数据、NCEP及ECMWF提供的逐日再分析资料,对天气形势、影响天气系统及相关的物理量进行诊断分析。结果表明:高空槽前西南气流加强使四川盆地热低压发展旺盛,引起白鹤滩的气压梯度增大致使偏南大风产生;中低层西南急流建立所产生的动量下传对偏南大风增幅作用显著;太阳辐射导致热低压强度以及动量下传强度变化使大风呈现明显的日变化特征;白鹤滩地形产生的狭管效应对大风的增强提供了有利条件。In order to further study a rare southerly gale process of magnitude 10 in Baihetan Hydropower Station,Sichuan Province on November 17th,2020,the weather situation,influencing weather system and related physical quantities were diagnosed and analyzed by using hourly meteorological element data of Xintian automatic station in Baihetan dam area and daily reanalysis data provided by NCEP and ECMWF.The results show that the strengthening of southwest airflow in front of the high-altitude trough causes the vigorous development of the hot low pressure in the basin to flourish,and the increase of the pressure gradient of the White Crane Tower beach leads to the southerly strong wind;the momentum generated by the establishment of the southwest rapids in the middle and lower layers has a significant effect on the increase of the southerly southerly winds;the strength of the thermal low pressure caused by solar radiation and the power transfer intensity of momentum.The change makes the general wind show obvious diurnal change;the narrow-tube effect caused by the topography of the white Crane beach provides favorable conditions for the enhancement of the wind.

关 键 词：气象学 极端大风 南支槽 热低压 太阳辐射 动量下传 狭管效应 

分 类 号：P458.3[天文地球—大气科学及气象学]