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气象:2023,49(8):995-1004
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一次高炮防雹动力效应的相控阵雷达观测分析
董亚宁,刘福新,孙鸿娉,杨永龙
(山西省人工影响天气中心,太原 030032; 山西省临汾市隰县气象局,隰县 041399)
A Study on Dynamic Effect of Hail Suppression by Anti-Hail Gun with Phased Array Radar
DONG Yaning,LIU Fuxin,SUN Hongping,YANG Yonglong
(Shanxi Weather Modification Center, Taiyuan 030032;Xixian Meteorological Station, Linfen of Shanxi, Xixian 041399)
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投稿时间:2022-11-18    修订日期:2023-06-08
中文摘要: 2021年7月8日山西省临汾市隰县组织了一次高炮防雹试验。利用隰县的相控阵雷达资料,对炮击强对流云后的动力效应进行分析。通过组合反射率对过程进行分析,可以看到本次作业的时机和部位是符合试验设计的,即:爆炸是在自然云发展期,炸点位于强回波柱上端。通过作业信息和弹道曲线估算试验中炮弹炸点位置,经过雷达、炮点、炸点的时空一致性转换后,对作业前后炸点邻域雷达参量变化进行分析。结果显示:作业前3~0 min,强回波柱处于发展增强中,在预定炸点附近未见多普勒谱宽区;作业后,在炸点正下端,强回波柱迅速衰弱、分裂、下沉,并在炸点区邻域呈现出多普勒谱宽明显的加宽且维持了2~3 min,最终导致强回波整体衰落,未见再度强化。这样的演化情景显示出一个效应链:强回波柱由盛转衰是在爆炸后的炸点开始的,爆炸激起的动力扰动蜕变为次级流,展宽了多普勒谱宽,不均匀的动力扰动场诱发的雷诺应力抑制了对流流场,使对流云整体衰落了。另外,从不同强度回波顶高和回〖JP2〗波样本数的统计可以看到,爆炸后强回波顶高迅速降低而相应的像素点数迅速减少;弱回波像素点的数值随强回波减少而增多,最后所有强度的回波像素点的数值皆随时间减小。
Abstract:Shanxi Province organized an hail suppression by anti-hail gun test on the afternoon of 8 July 2021 in Xixian County of Linfen City. This paper uses phased-array radar data from the Xixian County to analyse the dynamical effects following shelling of severe convective clouds. First of all, through the analysis of composite reflectivity, it can be seen that the operation time and position of this operation were in line with the test design. In other words, the explosion was during the natural cloud development period and the blast point was located at the upper end of the strong echo column. The location of the shell blast point in the test was estimated from the operational information and ballistic curve. The change in radar parameters in the neighborhood of the blast point before and after the operation is analyzed after the spatio-temporal consistency conversion of radar, shell point and blast point. The results show that the strong echo column was developing and intensifying in 3-0 min before the operation, and there was no Doppler spectrum wide area near the predetermined explosion point. After the operation, at the lower end of the blast site, the strong echo column rapidly weakened, split and sank, showing a significant broadening of the Doppler spectrum in the neighborhood of the blast site area. The broadening was maintained for 2-3 min, eventually leading to the overall decay of the strong echo without re-enhancement. This evolution scenario shows an effect chain: the transition from a strong echo column to a decaying one begins at the blast site after the explosion. The dynamical disturbance induced by the explosion metamorphoses into a secondary flow that broadens the Doppler spectrum, and the Reynolds stress induced by the inhomogeneous dynamical disturbance field suppresses the convective flow field, finally causing the overall decay of the convective cloud. In addition, the statistics of the top heights of the echoes and the number of echo samples of different intensities show that the top heights of the strong echoes decrease rapidly after the explosion and the corresponding number of pixels decreases 〖JP2〗rapidly. The value of the weak echo pixels increases as the strong echoes decrease and finally the value of the echo pixels decreases over time for all intensities.
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基金项目:中央引导地方科技发展资金项目(YDZJSX2021B017)、国家重点研发计划(2019YFC1510304)、山西省重点研发计划(202202130501020)共同资助
引用文本:
董亚宁,刘福新,孙鸿娉,杨永龙,2023.一次高炮防雹动力效应的相控阵雷达观测分析[J].气象,49(8):995-1004.
DONG Yaning,LIU Fuxin,SUN Hongping,YANG Yonglong,2023.A Study on Dynamic Effect of Hail Suppression by Anti-Hail Gun with Phased Array Radar[J].Meteor Mon,49(8):995-1004.