2022年“龙舟水”期间华南地区降水对公路交通的影响

Study on the Impacts of Precipitation on Highway Traffic over South China during the Dragon-boat Precipitation Period in 2022

利用公路交通气象监测网资料、国家级公路融合降水实况分析产品及公路阻断信息,分析了2022年“龙舟水”期间华南地区的公路交通降水特点及影响特征,并对此次过程的公路交通气象服务情况进行复盘。结果表明:1)“龙舟水”期间,降水对广东、广西主要高速公路运行均产生一定影响,其中广西受严重影响的公路里程在全省路网占比高于广东。2)降水引发的公路阻断事件总体呈现出广西多于广东,北部多于南部,国省干线公路多于高速公路的特征。其中,降水对广东道路交通的影响以降雨(积水)为主,对广西的影响则以崩塌、滑坡、泥石流等次生地质灾害为主。3)华南地区公路交通降水预报落区与实况较为一致,公路气象预报预警起到了较好的预报服务效果。同时,公路交通暴雨灾害风险预估产品对于公路阻断灾情的预判体现出较好的指示意义。

Based on the data from highway traffic meteorological monitoring network,the national highway merged precipitation analy-sis product and the traffic blocking information,the characteristics and impacts of precipitation on highway traffic in South China dur-ing the dragon-boat precipitation period in 2022 were analyzed.The results showed that:1)Precipitation displayed certain influence on major highways in Guangdong and Guangxi during the dragon-boat precipitation period,and higher proportion of severely affected road mileage in the road network occurred in Guangxi than Guangdong.2)The road blockage events caused by precipitation appeared in Guangxi were more than Guangdong,the north was more than the south,and the number of national roads and provincial roads was more than that of freeways.The impacts of precipitation on road traffic in Guangdong mainly originated from rainfall(waterlogging),while the major impacts on Guangxi were secondary geological disasters such as landslides,mudslides,etc.3)The precipitation fore-cast for highway traffic in South China was consistent with the observation,and the highway meteorological forecast and early warning played an important role in providing forecasting services.At the same time,the risk prediction products of highway traffic rainstorm disasters have good indications for the prediction of highway blocking disasters.