Method and system for deriving precipitation data in areas without data based on copula function

Abstract

The invention discloses a method and system for deriving precipitation data in areas without data based on Copula functions, belonging to the field of precipitation forecasting, based on the latest reanalysis of meteorological data, fully considering the influence of various meteorological elements on precipitation, combined with actual precipitation data in areas with data, The principal component analysis method was used to obtain the precipitation impact index, and the multi-dimensional joint distribution model of the precipitation impact index, simulated precipitation and measured precipitation was constructed through the Copula function. A multi-dimensional joint distribution model was reconstructed for areas without data, and the precipitation impact index and simulated precipitation were used as inputs, and the long sequence of measured precipitation in areas without data was calculated through the most likely combination design of conditions. The invention can fully consider the advantages of reanalysis data and the comprehensive influence of meteorological elements on precipitation, and can provide an important and highly operable reference basis for deriving precipitation information in areas without data.

Description

technical field [0001] The invention belongs to the technical field of precipitation forecasting, and more specifically relates to a method and system for deriving precipitation data in areas without data based on a Copula function. Background technique [0002] Precipitation is the direct source of terrestrial water resources and the primary link in the hydrological cycle. Precipitation data is one of the primary basic data of regional water resources and water environment. is of great significance. Due to the limitations of precipitation observation methods, the lack of basic precipitation information in remote areas often seriously restricts the development and utilization of local water resources and the maintenance of the ecological environment. How to deduce the precipitation data of areas without data is a hot and difficult point of current research. [0003] In a nutshell, there are currently three main ways to obtain precipitation data: weather radar, satellite rem...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a method and system for deriving precipitation data in areas without data based on the Copula function, thereby solving the problem that existing studies fail to make full use of each reanalyzed meteorological information and cannot solve the problem of no data. Technical Issues in the Description of Precipitation Information in Data Areas

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