ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 49 Issue 8 > 2023,49(8):995-1004. DOI:10.7519/j.issn.1000-0526.2023.062701 Prev Next
A Study on Dynamic Effect of Hail Suppression by Anti-Hail Gun with Phased Array Radar
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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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