A Method for Determining Rainstorm Intensity Formula

Abstract

The present invention provides a storm intensity formula determining method. The method comprises: acquiring local parameters in a historical storm intensity formula, and a period of time of adopted rainfall data; acquiring a period of time of new rainfall data; reversing a historical ITP table used when the historical storm intensity formula is deduced; selecting a distribution function form with a smallest fitting error, and reversing historical rainfall data with different frequencies; sampling the acquired new rainfall data by using an annual maximum method, and fusing with the historical rainfall data; performing frequency analysis to obtain a full information ITP table; and performing local parameter deduction of the storm intensity formula, screening an optimal local parameter, and obtaining an optimal new storm intensity formula. The method provided by the present invention solves the problem that old rainfall information data is hard to be acquired, avoids the problem that a large amount of rainfall data is sampled repeatedly, reduces the difficulty of storm formula deduction, and saves time for storm formula deduction. The method can be used as a deduction method for revising the storm intensity formula subsequently, which is time-saving and effort-saving and simple for operation.

Description

technical field [0001] The invention relates to the technical field of municipal engineering, in particular to a method for determining a rainstorm intensity formula. Background technique [0002] Due to the frequent occurrence of waterlogging during the rainy season in cities across the country in recent years, which has posed a huge threat to people's lives and property safety, the National Meteorological Administration and the Ministry of Housing and Urban-Rural Development jointly issued a document in 2014 requiring all localities to revise the rainstorm intensity formula. [0003] Complete and continuous rainfall data is the basis for deriving the rainstorm intensity formula. When deriving the rainstorm intensity formula, the data of each duration of the rainstorm intensity over the years is required. According to the "Outdoor Drainage Design Code" annual maximum value method, the minimum number of years of basic data should not be less than 20 years. Years, the minimum...

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Problems solved by technology

Since 2004, the Meteorological Bureau has implemented automatic detection and digital processing of meteorological data, which has brought great convenience to data storage and use; however, the storage of historical data is in the form of self-recording paper, and this part of data is often Time-consuming and labor-intensive, although the "rainfall self-recording paper color scanning digital processing system" was compiled under the auspices of the National Meteorological Administration to assist in the processing of paper data, but it still requires a lot of manpower and financial resources to preprocess the rainfall self-recording paper and scan the results. Accuracy correction, and some self-recording papers are difficult to identify and process due to poor preservation and the problem of rainfall data itself, which brings great difficulties to the collection and processing of basic rainfall data required for deriving the rainstorm intensity formula

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