Quantitative Precipitation Estimation Method Based on Dense Rainfall Stations

A rain gauge and dense technology, applied in the field of meteorological radar to estimate precipitation, can solve the problems that cannot accurately reflect the characteristics of changes in the local distribution of precipitation, and achieve the effect of avoiding errors

Active Publication Date: 2020-09-11
武汉中心气象台
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  • Abstract
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Problems solved by technology

However, this technology only uses one Z-R relationship within a radar measurement range, which cannot accurately reflect the variation characteristics of the local distribution of precipitation

Method used

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  • Quantitative Precipitation Estimation Method Based on Dense Rainfall Stations
  • Quantitative Precipitation Estimation Method Based on Dense Rainfall Stations
  • Quantitative Precipitation Estimation Method Based on Dense Rainfall Stations

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Experimental program
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Embodiment 1

[0030] Wuhan City is selected as the verification area for the quantitative precipitation estimation method based on dense rainfall stations of the present invention.

[0031] First, for the Wuhan radar rain measurement area, according to the distribution of the rainfall stations covered by it, the radar rain measurement area is divided by the Thiessen polygon method, and 1104 polygonal areas are obtained, as figure 1 shown.

[0032] Then, use the sum Q of rainfall in 1 hour at i rainfall stations in each small polygon area S Sh , and the basic reflectivity factor Z ih , according to the following formula, the Z-R relationship of each polygonal area S is obtained, that is, A Sh the value of

[0033]

[0034]

[0035] Among them, Z is the radar reflectivity factor, R is the rainfall intensity, A is the coefficient of the Z-R relationship, and b is 1.5;

[0036] A Sh Be the public coefficient of the selected polygonal area S;

[0037] Z Sh is the total radar reflect...

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Abstract

The invention puts forward a dense rainfall station-based quantitative precipitation estimation method comprising the following steps: a chosen radar rainfall measuring zone is divided into a plurality of small polygon-shaped zones, and a respective Z-R relation is adopted in each zone; when different zones are different in precipitation nature, errors caused due to adoption of the same Z-R relation can be prevented; when problems of radar data quality occur such as small radar reflectivity factors caused due to wave velocity resistance and the like, the method can be used for correcting precipitation estimation deviation, caused due to radar quality, to a certain degree via Z-R relation adjustment according to real time data.

Description

technical field [0001] The invention relates to the field of weather radar estimating precipitation, in particular to a quantitative precipitation estimating method based on dense rainfall stations. Background technique [0002] Quantitative estimation of precipitation by radar is an important technical reference for short-term near-warning. Combined with quantitative estimation of precipitation (QPE) by radar, there have been research results with various ideas and technical methods, such as variational method, Kalman filter method and probability pairing method, etc. [0003] At present, the main technique for quantitatively estimating precipitation by radar in Hubei Province is the combination of point measurement represented by rain gauge and area measurement represented by weather radar, and the real-time synchronous integration method of radar and rain gauge (RASIM). Compared with other methods at home and abroad, this method is advanced and practical in terms of theo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95
CPCG01S13/958Y02A90/10
Inventor 王珊珊吴翠红管振宇吴涛苏磊
Owner 武汉中心气象台
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