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An intelligent identification and early warning method of downburst based on radar data

A technology of intelligent identification and radar, applied in the field of atmospheric science, can solve the problems of fast generation and disappearance, small space scale of downburst, etc.

Active Publication Date: 2021-07-30
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, due to the characteristics of small spatial scale and fast generation and disappearance of downbursts, under the limitation of existing detection methods and technical conditions, there are still great technical bottlenecks in intelligent identification and early warning.

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  • An intelligent identification and early warning method of downburst based on radar data
  • An intelligent identification and early warning method of downburst based on radar data
  • An intelligent identification and early warning method of downburst based on radar data

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] In order to test the actual effect of the method described in the present invention, the present embodiment selects the basic data of a Doppler weather radar in Jingzhou, Hubei Province around 21 o'clock on June 1, 2015 for analysis. At about 21:32 on the same day, the passenger ship "Oriental Star" capsized, which shocked the whole country. The passenger ship sailed near the Damazhou waterway of the Yangtze River in Jianli County, Jingzhou City, and encountered a sudden downburst and the strong wind it brought. Heavy rains caused the passenger ship to capsize and 442 people were killed. Since the monitoring of strong convective weather such as downbursts is a continuous process, the radar base data at 13:13 on June 1, 2015 (UTC, the same below) is used as an example to illustrate.

[0036] Step 1: Read the basic data "Z_RADR_I_Z9716_20150601131300_O_DOR_SA_CAP...

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Abstract

The invention discloses a method for intelligent identification and early warning of downburst based on radar data. First, the optical flow field of the vertical section of the reflectivity factor is analyzed by the optical flow method, and the law of the evolution of the storm core over time is obtained. Then, the Lagrangian mechanical model is used to perform function fitting on the descending process of the storm core top height. Then, the histogram and Barthel coefficient statistical analysis method are used to match and identify the "positive and negative velocity pair" images in the radial velocity field in the middle layer of the storm core, and a series of threshold judgments are combined to finally realize the intelligent early warning of the downburst. Using this method, potential downbursts can be identified in the early stage of storm core uplift and rapid sinking, and the sinking rate of the storm core and the time to reach near the ground can be estimated, so as to realize the intelligent identification of downbursts , early warning.

Description

technical field [0001] The invention belongs to the field of atmospheric science, and relates to a method for realizing the intelligent forecast and early warning of downburst by using Doppler weather radar data to identify the convergence and divergence images of the radial velocity field. Background technique [0002] A downburst is a strong divergent linear airflow formed when the cold outflow formed in a strong convective storm reaches the near-surface layer. Smooth take-off and landing pose a serious threat. Although the disasters caused by downbursts are enormous, once they encounter mass and fatal disasters, the aviation and meteorological departments have long attached great importance to the strict monitoring of their formation and development. The rapid development and short duration make its monitoring, forecasting and early warning very difficult, and it has been a worldwide problem for a long time. [0003] As an important means of monitoring and analyzing sev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95G01S7/02
CPCG01S7/02G01S13/95Y02A90/10
Inventor 卞浩瑄王兴周显信王介君朱文镇
Owner NANJING UNIV OF INFORMATION SCI & TECH
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