GB/T 20481-2017 English PDFUS$599.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20481-2017: Grades of meteorological drought Status: Valid GB/T 20481: Historical versions
Basic dataStandard 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07.060 Word Count Estimation: 30,382 Date of Issue: 2017-09-07 Date of Implementation: 2018-04-01 Older Standard (superseded by this standard): GB/T 20481-2006 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China GB/T 20481-2017: Grades of meteorological drought---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.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 Scope 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 ForewordThis 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.IntroductionThe 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 level1 ScopeThis 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 referencesThe 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 rating3 Terms and definitionsThe 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. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20481-2017_English be delivered?Answer: Upon your order, we will start to translate GB/T 20481-2017_English as soon as possible, and keep you informed of the progress. 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Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.Question 5: Should I purchase the latest version GB/T 20481-2017?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20481-2017 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. |
