Rainfall estimation method based on weather radar reflectivity feature matching

A weather radar, feature matching technology, applied in the field of atmospheric science, can solve difficult problems

Active Publication Date: 2016-09-28
南京信大气象科学技术研究院有限公司
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Problems solved by technology

Although the parameters of the Z-R relationship in some meteorological operational software are adjustable, it is very di

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  • Rainfall estimation method based on weather radar reflectivity feature matching
  • Rainfall estimation method based on weather radar reflectivity feature matching
  • Rainfall estimation method based on weather radar reflectivity feature matching

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Embodiment Construction

[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] In this embodiment, the basic reflectivity data of the 9-layer volume scan of Doppler weather radar in Nanjing area were selected from 2010 to 2015. The radar data format is CINRAD-SA, the volume scan mode is VCP21, the time resolution is 6 minutes, the radial resolution is 1km, and the geographic location is 118.698° east longitude and 32.191° north latitude. Eliminate radar data without obvious precipitation echoes, and perform necessary quality control on the remaining radar data to be calculated. Then, the radar data are processed one by one as follows:

[0044]Step 1. It is advisable to set the name of the current radar base data file to be processed as RF.bin, extract the basic reflectance data in the file, and convert the original data structure in polar coordinate form to plane direct coordinate form. Calculate the CAPPI at...

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Abstract

The invention discloses a rainfall estimation method based on weather radar reflectivity feature matching. First of all, a radar reflectivity feature database is constructed, then matching rules of live radar data and the radar reflectivity feature database are determined, and based on this, an optimal parameter A and an optimal parameter b in a Z-R relation are dynamically determined. According to the invention, dynamical optimization of the Z-R relation is realized in short temporary rainfall forecast service application, and the accuracy of rainfall estimation through a radar is further improved.

Description

technical field [0001] The invention belongs to the field of atmospheric science, and in particular relates to a precipitation estimation method based on weather radar reflectivity feature matching. Background technique [0002] Weather radar (hereinafter referred to as radar) is an important means of strong convective weather detection. It can detect the rain intensity and rainfall distribution within its scanning radius, and can further estimate the total precipitation and precipitation rate, especially in short-term nowcasting and other services. has been widely used. [0003] Calculation based on the Z-R relationship is the key method for radar to estimate precipitation, and the accuracy of the estimated precipitation largely depends on the Z-R relationship (Z=AR b ) in the choice of parameter A and parameter b. Many scholars have obtained the relatively optimal parameter A and parameter b in a specific area and / or a specific period through the analysis and research of...

Claims

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Application Information

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IPC IPC(8): G01S13/95
CPCG01S13/95Y02A90/10
Inventor 王兴苗春生王坚红钱代丽王丽娟
Owner 南京信大气象科学技术研究院有限公司
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