GB/T 35234-2017Specifications for surface meteorological observation—Frozen soil (English PDF)
地面气象观测规范 冻土
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 29, 2017
Implementation date
July 1, 2018
Scope
GB/T 35234-2017 is the English-translated version of 地面气象观测规范 冻土.
GB/T 35234-2017 is the Chinese standard "Specifications for surface meteorological observation—Frozen soil". Its scope clause reads: This standard specifies the technical requirements and observational methods for the observation of frozen earth in surface meteorological observations.
This standard applies to ground observation of frozen ground artificial observation. Its clauses include terms and definitions; technical requirements; observation instruments and methods.
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Document preview — GB/T 35234-2017
National Standard of the People's Republic of China
- ICS
- 07.060
- Classification
- A 47
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 technical requirements
- 5 observation instruments and methods
1 Scope
This standard specifies the technical requirements and observational methods for the observation of frozen earth in surface meteorological observations.
This standard applies to ground observation of frozen ground artificial observation.
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 35221 General Rules for Surface Weather Observation
3 Terms and definitions
GB/T 35221 and defined by the following terms and definitions apply to this document.
3.1 Frozen soil
Soil containing moisture is frozen as the temperature drops below 0 ° C or below 0 ° C.
4 technical requirements
4.1 Observation content
Measure the depth of the upper and lower limits of each frozen layer in centimeters (cm).
4.2 Observation time
Observations begin when the surface temperature drops below 0 ° C or below 0 ° C until the soil is completely thawed. Daily observation at 08.00.
4.3 Observation Location
Should choose to observe the site has a natural covering of the lot.
5 observation instruments and methods
5.1 Frozen soil
5.1.1 Structure
Frozen soil consists of an outer tube and an inner tube. The outer tube is a 0cm scale marked hard rubber tube; the inner tube is a centimeter scale rubber
Tube, closed at the bottom, the top and short metal pipe, sticks and iron cap connected.
5.1.2 Selection requirements
Should be based on the local maximum depth of frozen soil may choose to use the length of the standard for frozen soil.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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