GB/T 42075-2022Methods of regional rainstorm process assessment (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document establishes the determination of regional rainstorm processes and the division of comprehensive intensity levels, and describes the corresponding calculation methods.

This document applies to monitoring, assessment and servicing of regional storm events.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 35228-2017 Standardized Precipitation for Surface Meteorological Observation

GB/T 42073-2022 Climate Risk Index Drought

QX/T 118-2020 Quality control of meteorological observation data on the ground

3 Terms and Definitions

The following terms and definitions apply to this document.

4 Data requirements

The precipitation observation data should meet the requirements of GB/T 35228-2017, and the daily precipitation observation data should be selected from stations with relatively uniform distribution. uniform and stably obtainable meteorological observation sites, and should.

a) Length of historical data. not less than 30 years;

b) Data quality. meet the requirements of QX/T 118-2020;

c) Daily precipitation. accumulated from 20.00 on the previous day (Beijing time) to 20.00 on the current day or from 08.00 on the current day (Beijing time) to 08.00 on the next day rainfall.

5 Determination of regional rainstorm days

On a certain day, there are more than or equal to 0.8% of the adjacent monitoring stations (the distance between stations is less than or equal to 350km) in the country.