Method for establishing relationship between a radar reflectivity factor and rainfall intensity based on Copula function
A technology of radar reflection and establishment method, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, ICT adaptation, etc., to achieve the effect of improving the accuracy of precipitation
Pending Publication Date: 2020-09-25
江西省水利科学研究院
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At present, there is no literature that introduces the Copula function into the establishment of the relationship between the radar reflectivity factor and the precipitation intensity
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[0021] The present invention will be further described below by means of embodiments and in conjunction with the accompanying drawings.
[0022] Such as Figure 1-Figure 2 As shown, a method for establishing the relationship between radar reflectivity factor and precipitation intensity based on Copula function collects radar reflectivity factor and precipitation intensity data, determines the marginal probability distribution function, and constructs the joint probability of radar reflectivity factor and precipitation intensity based on Copula function Distribution function, and then solve the conditional probability distribution function of precipitation intensity when the radar reflectivity factor is given, and on this basis, establish the relationship between radar reflectivity factor and precipitation intensity. figure 1 It is the calculation flowchart of the present embodiment, and it is carried out according to the following steps:
[0023] 1. Collect radar reflectivity...
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The invention discloses a method for establishing a relationship between a radar reflectivity factor and rainfall intensity based on a Copula function. The method comprises the steps of: collecting Radar reflectivity factors and rainfall intensity data; determining an edge probability distribution function, constructing a joint probability distribution function of the radar reflectivity factor andthe rainfall intensity based on a Copula function, further solving a conditional probability distribution function of the rainfall intensity when the radar reflectivity factor is given, and establishing a relationship between the radar reflectivity factor and the rainfall intensity on the basis. The quantitative statistical relationship between the radar reflectivity factor and the rainfall intensity can represent the non-normal characteristics of the reflectivity factor and the rainfall intensity, accurately describes the nonlinear correlation structure between the radar reflectivity factorand the rainfall intensity, and facilitates the improvement of the rainfall measurement precision of the radar.
Description
technical field [0001] The invention belongs to the field of radar measurement of precipitation, in particular to a method for establishing the relationship between radar reflectivity factor and precipitation intensity based on Copula function. Background technique [0002] Accurate regional precipitation measurement is of great significance for scientific understanding of hydrological cycle, forecast and early warning of storm and flood, and water resources management. Compared with traditional surface rainfall stations, weather radar has the advantages of wide measurement range, high temporal and spatial resolution, and can obtain large-area quantitative precipitation data in time. It is currently an effective tool for measuring regional precipitation and is widely used by meteorological departments. [0003] The radar measurement of precipitation mainly uses the obtained radar reflectivity factor Z, and calculates R according to the relationship between the radar reflecti...
Claims
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IPC IPC(8): G06F30/20G01S13/95G06F111/08
CPCG06F30/20G01S13/958G06F2111/08Y02A90/10
Inventor 刘章君许新发成静清温天福
Owner 江西省水利科学研究院