This standard specifies the level of surface rainfall in river basins. This standard is applicable to the business and scientific research of surface rainfall in river basins. GB/T 20486-2006 Level of surface rainfall in river basins GB/T20486-2006 Standard download decompression password: www.bzxz.net
This standard specifies the level of surface rainfall in river basins. This standard is applicable to the business and scientific research of surface rainfall in river basins.

ICS 07.060
National Standard of the People's Republic of China
GB/T20486—2006
Grade of valley area rainfall061214000010
Published on 2006-08-28
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of the People's Republic of China
Implemented on 2006-11-01
People's Republic of China
National Standard Promotion
Grade of valley area rainfall
GR/T 20486 -2006
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Appendix A of this standard This standard is an informative appendix. This standard is proposed by the China Meteorological Administration. This standard is under the jurisdiction of the Policy and Regulations Department of the China Meteorological Administration. Foreword This standard was drafted by the Business Department of Henan Meteorological Bureau and Henan Meteorological Observatory. GB/T20486—2006 This standard was drafted by the following people: Zhang Cun, Li Fei, Mi Hongtao, Cao Tie, Qian Quanzhou, Sun Jinglan, Bu Yelin, Tian Wanshun, and Zheng Shilin. GB/T20486--2006 my country has a vast territory and many rivers. Basin surface rainfall is not only an important parameter for flood forecasting and flood control dispatching, but also an important basis for flood control and flood fighting decision-making at all levels of government. For a long time, my country's meteorological and hydrological workers have worked closely together, starting from the needs of flood control, flood fighting, disaster reduction, and emergency rescue, and have made many important achievements in the study of basin surface rainfall and flood-causing rainstorms. Especially after the rare flood disaster in the Yangtze River Basin in 1998, my country strengthened the relevant area rainfall business and service work. To this end, based on research and reference to a large number of relevant documents, this standard was compiled to guide the analysis, forecast and inspection of basin area rainfall. 1 Scope
Rainfall level in river basins
This standard specifies the level of area rainfall in river basins. This standard applies to the business and scientific research of area rainfall in river basins. 2 Terms and definitions
The following terms and definitions apply to this standard. 2.1
valley
GB/T20486-—2006
The area where rivers, tidal basins and reservoirs collect surface runoff formed by rainfall, generally bounded by watersheds and other basin boundaries. 2.2
Station rainfall
Liquid precipitation that falls from the sky to the ground during a period of time, and accumulates at a certain depth at a certain station on the horizontal surface without evaporation, infiltration, or loss. The rainfall is measured in millimeters (mm). 2.3
grade of rainfall
Rainfall grade
The grade determined according to the size of the station rainfall within a unit time is used to reflect the intensity of rainfall. Area rainfall
refers to the average rainfall over a certain area during a period of time. 3 Division of area rainfall grades
The division of area rainfall grades in river basins is based on the division of station rainfall grades (see Appendix A), and is divided into six grades: light rain, moderate rain, heavy rain, rainstorm, heavy rainstorm and extremely heavy rainstorm. The 12h and 24h surface rainfall amplitude values ​​corresponding to each level are shown in Table 1
Surface rainfall level in river basins
Heavy rainstorm
Extremely heavy rain
Calculation method of surface rainfall
Surface rainfall level classification table in river basins
12h surface rainfall value/mm
10.0-~19.9
20.0~39.9
The surface rainfall is calculated using the arithmetic mean method and the Thiessen polygon method. 24h surface rainfall value/mn
6.0--14.9
15.0~29.9
30.0~59.9
60.0~150.0www.bzxz.net
The arithmetic mean method is applicable to basins with more and more evenly distributed rainfall stations or basins where the surface rainfall is calculated using the grid point rainfall. The Thiessen polygon method is applicable to basins with uneven distribution of rainfall stations. 1
GB/T 20486—2006
Arithmetic mean method
The sum of the inter-period rainfall of all rainfall stations (grid points) in the basin, divided by the total number of rainfall stations (grid points). The calculation is as follows:
Where:
P—the south face of the basin, in millimeters (mm); P: the rainfall of each rain gauge station in the basin during the same period, in millimeters (mm); r——the number of rain gauge stations.
4.2 Thiessen polygon method
Connect the rain gauge stations in the basin with straight lines, and make perpendicular bisectors of each connecting line. These perpendicular bisectors intersect to divide the basin into thousands of polygons, each of which has a rain gauge station. Assume that each rain gauge station takes the polygon where it is located as the control area, then the basin surface rainfall is the sum of the rainfall of each station multiplied by the sum of their respective control areas divided by the total area of ​​the basin. The calculation is as shown in formula (2): P
wherein:
W,---is the ratio of the control area of ​​each rain gauge station to the total area of ​​the basin, that is, the weight coefficient, W,-S./S;.S,--the control area of ​​each rain gauge station in the basin; S--the total area of ​​the basin,
P---the surface rainfall in the basin;
P, the rainfall of each rain gauge station in the same period;
n--the number of rain gauge stations.
+**(2)
Station rainfall level
Heavy rain
Special frost
Appendix A
(Informative Appendix)
Station rainfall level classification table
12h rainfall value/mm
0. 1~4. 9
5.0--14.9
15.0~20.9
30. 0 ~69. g
70.0~-140,0
>140, 0
GB/T 20486--2006
24h rainfall value/mm
10., 0~24, 9
25. 0-49. 9
50. 0~-99. 9
100.0--250.0
CB/T 20486—2006
Art Examination Literature
［1］Bai Dian, Guidelines for the Preparation of Standards. Beijing: China Standards Press, 2002[2]China Meteorological Administration, Provisional Provisions on Surface Rainfall Forecasting in the Seven Major River Basins of China. Issued in April 2003Wei Zhongming. Chinese-English Dictionary of Water Conservancy and Hydropower Technology. Beijing: Water Conservancy and Hydropower Press. 1993L31
Chapter. Feasibility of Medium-term Forecast of Flood-causing Heavy Rainfall. Beijing: Meteorological Press, 1993[5］Wang Jiaqi, Hu Mingsi, Extreme Distribution of Surface Rainfall in China, Progress in Water Science 1993 (1). 26" Editorial Board of Popular Science Dictionary. Dictionary of Atmospheric Sciences. Beijing: Meteorological Press. 1994.177
Shi Mingxiao: Commonly used formulas in atmospheric science. Beijing: Meteorological Press. 1994[8]
Li Daofeng, Li Yu. Discussion on the forecast technology of surface rainfall and flood-causing rainstorm in the Qinhe River Basin in Shanxi. Shanxi Meteorology, 1995 (4) Fu Changfeng, Li Chaoxing, et al. Calculation and forecast of surface rainfall in the Sanhua area of ​​the Yellow River. Beijing: Meteorological Press. 1996, Lio
Yang Yang, Fang Qinsheng. Calculation of surface rainfall using geographic information system software, Hydrology. 1997 (6), Xu Sheng, Liu Xiaohu. A graphical objective interpolation method for analyzing precipitation data, Hydrology, 1999 (2). Meng Suizhen, Peng Zhiban, et al., A method for calculating the average precipitation of a basin, Beijing: Meteorological Press, 1999.Dong Guanchen, Ye Linmao, et al. Application of surface rainfall in weather forecasting. Meteorology, 2000 (1) Xiong Qiufen, et al. Surface rainfall forecasting method and experimental results in the Three Gorges area. Meteorology, 2000 (11) Xu Jing, Lin Jian, et al. Calculation method and application of surface rainfall in seven major rivers. Meteorology, 2001 (11) Yu Hua, Comparative analysis of surface rainfall calculation methods. Sichuan Meteorology, 2001 (3) Shi Yueshan, Objective analysis and four-dimensional assimilation. Meteorological Science and Technology: 2001 (1). [18]
Li Ping, Zhang Kejia, Trial 1. ASGREM output precipitation forecast to produce the Yellow River Sanhua area rainfall forecast. Beijing: Meteorological Publishing House, 2001.
[19] Li Wujie, Yu Renqiao, et al. Comparison of several surface rainfall scene calculation methods in meteorological and hydrological applications, Heavy Rain·Disasters (IV) [20]
Wu Xingguo, et al., Analysis of synthetic surface rainfall characteristics of 17 floods in Nanning, Guangxi Meteorology: 2002 (2) [2]
Wang Xinlong, You Fengchun, et al., Calculation method and application of surface rainfall in Haihe River Basin. Hebei Meteorological Bureau: 2002 (4) F22]
Liang Yu, Bu Yalin, Using weighted integration of numerical products to produce surface rainfall forecast for the Henan section of Zhunhe River. Northeast China: Meteorological Press, 2003. [23]
Yang Yang, Zheng Wen, et al. Operational application experiment of T213 precipitation forecast product in surface rainfall forecast in Guanhe River Basin. Beijing: Meteorological Press, 2003.
Liu Jian, Gong Dongren, et al. Analysis and comparison of HLAFS and T213 precipitation forecast products in plum rain season, Meteorological Bureau, 2004 (supplement), _241
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