Gust front automatic recognition method based on Doppler weather radar data

A weather radar and automatic identification technology, applied in the field of meteorology, can solve problems such as failure to play, no breaks seen, and gust fronts not seen yet

Inactive Publication Date: 2017-03-22
TIANJIN UNIV
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Problems solved by technology

literature [3] The method cannot be used when there is an invalid velocity area in the velocity field data; in the reflectivity intensity field, the two-way gradient method limits the distance between the narrowband echo and the parent ...

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  • Gust front automatic recognition method based on Doppler weather radar data
  • Gust front automatic recognition method based on Doppler weather radar data
  • Gust front automatic recognition method based on Doppler weather radar data

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Embodiment

[0073] Example: A gust front observed in a Doppler radar low-elevation reflectivity map as Figure 1(a) to Figure 1(e) As shown, its image features include but are not limited to:

[0074] 1) A gust front usually appears as a weak narrow-band echo at the periphery of a strong echo, generally located at the front or side of the thunderstorm parent body, which is separated from or partially adhered to the thunderstorm parent body, as shown in Figure 1(a);

[0075] 2) Width variation range: 2km-10km;

[0076] 3) Length variation range: 40km-300km;

[0077] 4) The value of reflectivity is indeterminate: at the same time, the echo intensity on a gust front area is usually different, as shown in Figure 1(b). At different times, the value and distribution of the echo intensity on the same gust front will also change (As shown in Fig. 1(b) and Fig. 1(c), the date is 2006.06.14, the time of Fig. 1(b) is 09:49 and the time of Fig. 1(c) is 09:31), but they are mostly concentrated in 10dBz...

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Abstract

The invention discloses a gust front automatic recognition method based on Doppler weather radar data, and the method comprises the following steps: 1), extracting a weak narrow band echo suspected area according to the radar performance characteristics of gust front through employing a local binaryzation algorithm; 2), carrying out the segmentation, connection and screening of the weak narrow band echo suspected area, and obtaining a skeleton image corresponding to a weak ridge-shaped belt; 3), obtaining an optical flow field through two low-pitching-angle radar images at a current moment and a former moment, supposing the matched skeletons at the former and latter moments in the skeleton images corresponding to the weak ridge-shaped belt obtained at step 2) as the suspected gust front, and recognizing the gust front according to the relation between the position and speed of the suspected gust front and the position and speed of a windstorm cell and the relation between the direction and speed of the suspected gust front. The method achieves the automatic detection of the gust front, achieves the timely early warning of disasters, and reduces the economic loss and casualty. Moreover, the validity of the method is verified.

Description

technical field [0001] The invention relates to the field of meteorology, in particular to an automatic identification method of gust front based on Doppler weather radar data. Background technique [0002] Weather radar is one of the main tools for monitoring and early warning of severe convective weather. Weather radar emits electromagnetic waves in the form of pulses. When the electromagnetic waves encounter precipitation materials (snowflakes, raindrops and hail, etc.), most of the energy continues to move forward, while a small part of the energy is scattered in all directions by the precipitation material, and the energy scattered back is received by the radar. [0003] In the mature stage of the convective cell, the cold downdraft, as a cold air, expands outward at the bottom layer near the ground, and merges with the warm and humid airflow in front of the cell to form a front. This phenomenon is reflected in the radar reflectivity map. Usually, a weak ridge-shaped a...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/292G01S13/95
CPCG01S7/2923G01S7/415G01S13/95Y02A90/10
Inventor 王萍袁悦
Owner TIANJIN UNIV
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