毫米波雷达在北仑港区海雾监测中的应用

Application of Millimeter Wave Radar in Sea Fog Monitoring at Beilun Port

2016年底,毫米波雷达在国内首次作为一种海雾监测的技术手段被引入到宁波北仑港区。本文利用2015-2018年北仑港周边多个区域自动站的能见度监测资料,分析区域内海雾分布特点,并对比了2018年两次低能见度天气个例。结果表明:①不同区域海雾差别较大,沿海区域雾日比陆地多,高海拔的较低海拔多;②港区海雾主要出现在3-6月并有逐月增多趋势;③毫米波雷达监测到的海雾个例,回波强度在-20dBz左右,可完整记录雾的空间分布及其生消过程,毫米波雷达能清晰监测到云、雾的分层分布。毫米波雷达在港区海雾监测中具有明显优势。

The millimeter wave radar was introduced into the Ningbo Beilun Port area in the late 2016,as a new technique of sea fog monitoring.Based on the visibility monitoring data of several regional automatic stations around Beilun Port from 2015 to 2018,the characteristics of sea fog distribution are summarized.Through the analysis and comparison of two low-visibility weather cases in 2018,it is concluded that millimeter wave radar has obvious advantages in sea fog monitoring in port areas.The analysis shows that the fog days are different in different regions,the fog days monitored in coastal area are more than those in land,and also the fog days monitored in the high altitude areas were more than those in the lower altitude areas.The sea fogs in the harbor areas mainly appear in March to June and have the tendency of increasing month by month.In the case of sea fogs monitored by millimeter wave radar,the echo intensity is about-20 dBz,which can completely record the spatial distribution of fogs and their generation and elimination processes.The millimeter wave radar can clearly monitor the layered distribution of clouds and fogs.