Abstract:
This study delves into the two detonation experiments conducted in Xiangshan and Zhengyangmen, Beijing. Using high-precision laser wind radar and wavelet analysis, we explored the dynamic characteristics of the disturbance response of natural wind fields caused by shelling. The results show that detonation influences the wind field, with both experiments (below 300 m altitude) displaying a synchronous wind-direction turning phenomenon with the start and end of detonation. The dynamic disturbance caused by detonation generated a Reynolds stress effect and formed secondary circulation vortices. The impact of this disturbance is reflected by the dominant oscillation in wavelet analysis. Detonation stimulated the formation of multiscale vortex structures, predominantly located at heights of 150–250 m, which diminished with increasing altitude. Our analysis indicates that the impact of the dynamic disturbance in both experiments was the strongest in the vertical wind direction, resulting in the formation of large, stable vortices characterized by significant scale, amplitude, and duration, showing minimal variation with height. The horizontal wind direction was affected to a lesser extent, with larger vortices at lower altitudes quickly transitioning into smaller ones at higher altitudes. Conversely, the horizontal wind speed experienced the least impact, forming the smallest and weakest vortices with short periods and low amplitudes. The intensity and type of shelling significantly influenced the characteristics of wind-field disturbances. For instance, smaller salutes and more divergent launches resulted in weaker secondary flow fields, diminishing the maintenance and enhancement effect of shelling on the vortices. Our findings indicate that nonuniform disturbed airflow fields can excite asymmetric vortex pairs. The occurrence of these vortex pairs alters the dominant wind direction and wind components, thereby forming updrafts, disrupting the original balance, and possibly making conditions more favorable for precipitation, ultimately achieving artificial weather modification.