Downburst identification method and device based on near-ground divergence field and storage medium

Abstract

The invention discloses a downburst identification calculation method based on a near-ground divergence field, which comprises the following steps: firstly, extracting a reflectivity factor and radial speed information of convective echoes detected by a Doppler weather radar, carrying out quality control to obtain speed data and reflectivity factor information after quality control, and then using a linear least square method, obtaining the divergence of multiple elevation angles through calculation, obtaining the distribution of the multi-elevation-angle divergence of the preliminarily deleted convective echoes through a set distance threshold value and a reflectivity factor threshold value, extracting the convergence of the convective echoes and the vertical distribution of the radiation on the basis, and analyzing the space structure of the convective echoes; and obtaining a downburst occurrence probability based on a divergence threshold established by typical downburst examples in warm seasons. According to the method, the defects of downburst monitoring, forecasting and early warning can be overcome, and the requirements of sensitive users for monitoring downburst and forecasting and early warning disastrous gale generated by the sensitive users are met.

Description

technical field [0001] The present application relates to the field of atmospheric science research, and in particular to a calculation method, equipment and storage medium for downburst identification based on the near-surface divergence field. Background technique [0002] The relationship between the atmospheric boundary layer and human activities is the closest, and the change of wind speed has a great impact on human production activities, especially when it rushes out from the bottom of the storm cloud and forms a strong downdraft that explodes outward near the ground, that is, a downstorm. It will form a strong wind above 17.9m / s (eight-level wind), causing serious disasters, and has strong destructive power to buildings, towers, and aircraft. The strong downdraft in the downburst and the annular vortex after the downburst touches the ground will cause different hazards. The strong low-altitude wind shear generated by the strong downdraft will cause the aircraft to l...

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Problems solved by technology

[0004] In order to solve the problem that the existing surface automatic weather station network is sparsely distributed and the detection wind speed is low, this application provides a calculation method, equipment and storage medium for downburst identification based on the near-surface divergence field

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