GB/T 20481-2017 (GB/T20481-2017, GBT 20481-2017, GBT20481-2017)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 20481-2017 | English | 599 |
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5 days [Need to translate]
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Grades of meteorological drought
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GB/T 20481-2017
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| GB/T 20481-2006 | English | 879 |
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Classification of meteorological drought
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GB/T 20481-2006
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Standards related to: GB/T 20481-2017
| Standard ID | GB/T 20481-2017 (GB/T20481-2017) | | Description (Translated English) | Grades of meteorological drought | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A47 | | Classification of International Standard | 07.060 | | Word Count Estimation | 30,351 | | Date of Issue | 2017-09-07 | | Date of Implementation | 2018-04-01 | | Older Standard (superseded by this standard) | GB/T 20481-2006 | | Drafting Organization | National Climate Center, China Meteorological Administration Bureau of Forecasting and Network, China Meteorological Bureau Lanzhou Institute of Arid Meteorology | | Administrative Organization | National Climate and Climate Change Standardization Technical Committee (SAC / TC 540) | | Proposing organization | China Meteorological Administration | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee |
GB/T 20481-2017
Grades of meteorological drought
ICS 07.060
A47
National Standards of People's Republic of China
Replacing GB/T 20481-2006
Weather drought level
2017-09-07 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Foreword Ⅲ
Introduction IV
1 range 1
2 Normative references 1
3 Terms and definitions 1
4 Precipitation anomaly percentage 2
5 Relative Humidity Index 2
6 Standardized precipitation index 3
7 Standardized precipitation evapotranspiration index 3
8 Palmer Drought Index 4
9 Meteorological Drought Composite Index 5
Appendix A (Normative) Method of calculating the percentage of precipitation anomaly 6
Appendix B (Normative) Relative humidity index calculation method 7
Appendix C (Normative) Calculation method of potential evapotranspiration 8
Appendix D (Normative) Standardized precipitation index calculation method 14
Appendix E (Normative) Standardized method for calculating evapotranspiration index 16
Appendix F (Normative) Palmer drought index calculation method 18
Appendix G (Normative) Standardized weight precipitation index calculation method 21
Appendix H (Informative) The value of the seasonally adjusted coefficient Ka 22
References 24
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 20481-2006 Weather Drought Rating, compared with GB/T 20481-2006, the main technical changes are as follows.
--- In the introductory part, increase the original standard need to amend the reasons, explain where the several aspects were revised, and the revision effect
A brief explanation.
--- Increase "Normative references" chapter (see Chapter 2).
--- Remove the "precipitation" "temperature" and other commonly used terms and definitions (see.2006 version 2.1 ~ 2.5).
--- Added "standardized precipitation index" "standardized evapotranspiration index" "Palmer Drought Index" "meteorological drought index" and other surgery
Language and definition (see 3.7 ~ 3.10).
--- Modify the "precipitation anomaly percentage" "potential evapotranspiration" "relative humidity index" "meteorological drought" "meteorological drought index" "weather
Drought level "and other terms (see 3.4-4.6, 3.3-1.3.3,.2006 edition of 2.20,2.6,2.10,2.12 ~ 2.14).
--- "Precipitation anomaly percentage" "relative humidity index" "standardized precipitation index" "Palmer Drought Index" "meteorological arid
The composite index "is independent (see Chapter 4 ~ Chapter 6, Chapter 8 ~ Chapter 9,.2006 edition 3.1 ~ 3.3, 3.5, Chapter 4).
--- Increase "standardized precipitation evapotranspiration index" section (see Chapter 7).
--- Each section includes an overview, drought levels and calculation methods of three parts (see Chapter 4 ~ Chapter 9).
--- Change "Integrated Weather Drought Index (CI)" to "Meteorological Drought Composite Index (MCI)" (see Chapter 9, section 4 of the.2006 edition
chapter).
--- The "integrated meteorological drought rating" to "meteorological drought index level", the level of classification criteria and the extent of the impact of drought table
The content was revised (see 9.2,.2006 version 4.1).
--- The "integrated meteorological drought index calculation method" to "meteorological drought composite index calculation method" gives a new calculation formula
And coefficients (see 9.3, version.2006, version 4.2).
--- The "determination and evaluation of the arid process" and "meteorological drought monitoring report," delete the content (see.2006 version 4.3, appendix
A).
--- The common index calculation method in Appendix A ~ Appendix G, increase Appendix H "seasonal adjustment coefficient Ka value method"
(See Appendix A ~ Appendix H).
This standard is proposed by China Meteorological Administration.
By the National Climate and Climate Change Technical Committee (SAC/TC540) centralized.
This standard drafting unit. National Climate Center, China Meteorological Administration Forecast and Network Division, China Meteorological Administration Lanzhou Institute of Arid Meteorology.
The main drafters of this standard. Zhang Cunjie, Liu Haibo, Song Yanling, Liao Yao Ming, Duan Juqi, Cai Wen Yue, Wang Suping.
This standard replaces the standards previously issued as.
--- GB/T 20481-2006.
introduction
The problem of drought is very complex and involves a wide range of issues. It can be divided into meteorological drought, agricultural drought, hydrological drought and economic and social drought
Etc. Meteorological drought is the cause of other types of drought and the basis for monitoring and evaluation. National standard (GB/T 20481-2006) released in.2006
Proposed the Integrated Weather Drought Index (CI), which has been applied and tested in the national drought monitoring business services in recent years, reflecting well
The distribution of drought frequency in different regions of China and the seasonal distribution of different levels of drought during the year. But several major drought events in recent years
Some problems have also been exposed in the monitoring service. First, the response to the precipitation process is too sensitive and the process of drought development appears unreasonable jump phenomenon;
Second, it reflects the light drought in the major drought process, especially for the drought with less than 90 days of precipitation. For CI indicators
The project team carried out a large number of surveys and comparative tests to develop a new meteorological and drought comprehensive monitoring index MCI since.2012
Since the pilot run and comparative tests have been conducted in the national and provincial drought monitoring services. The results show that the monitoring effect of the MCI index is better than
CI index.
Relative to CI indicators, MCI indicators are mainly improved in the following aspects. First, the introduction of a standardized weighted precipitation index
SPIW60, so that the phenomenon of irrational jump in the process of drought development has been significantly reduced; the second is to consider the impact of longer-term precipitation (150 d
Quasi-precipitation index SPI150), the cumulative effect of drought development more prominent, major drought events reflected more obvious; the third is the introduction of a seasonally adjusted
Section coefficient Ka, according to different regions and different seasons to adjust the empirical coefficient, the drought monitoring services more targeted.
In addition, a new standardized SPEI has been added to enrich the content of the Meteorological and Drought Monitoring Index for different users
Use.
Weather drought level
1 Scope
This standard specifies the calculation method of meteorological drought index, classification criteria and the determination of drought process.
This standard applies to meteorology, agriculture, hydrology and other related areas of drought monitoring, assessment of business and research.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 32135 regional drought level
GB/T 32136 agricultural drought rating
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Meteorological drought
In a certain period of time, because of the unbalanced income and expenditure of evapotranspiration and precipitation, the expenditure on water is greater than that of water, resulting in the shortage of surface water
phenomenon.
3.2
Meteorological drought index meteorologicaldroughtindex
According to the principle of meteorological drought formation, a comprehensive index composed of precipitation, evapotranspiration and other factors is constructed to monitor or evaluate a certain area
The extent of surface water shortage due to abnormal weather and climate in a certain period of time.
3.3
Describe the level of meteorological drought.
3.4
Precipitation anomaly percentage precipitationanomalyinpercentage; PA
The difference between the precipitation at a certain period and the average precipitation over the same period divided by the average precipitation over the same period,
(%) Said.
3.5
Potential evapotranspiration potentialevapotranspiration; PET
In the underlying surface wet conditions, the water supply to maintain adequate evapotranspiration, the unit expressed in millimeters (mm).
3.6
Relative humidity index relativemoistureindex; MI
The difference between the precipitation over a period of time and the potential evapotranspiration over the same period is divided by the value of potential evapotranspiration over the same period.
3.7
Standardized precipitation index
It is assumed that precipitation in a certain period of time obeys the probability distribution of Γ, and the normalized index of the precipitation is obtained.
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