GB/T 42176-2022The grade of wave height (English PDF)
海浪等级
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 30, 2022
Implementation date
April 1, 2023
Scope
GB/T 42176-2022 is the English-translated version of 海浪等级.
GB/T 42176-2022 is the Chinese national scale that sorts ocean waves into grades by their height, for wave observation and wave forecasting.
It defines the quantities the grading rests on: the ocean wave itself, wave height as the height difference between an adjacent crest and trough, the average of the highest one-third and of the highest one-tenth of the wave heights measured over a period, and the whitecap.
Clause 1 applies it to wave observation, forecasting and warning, and to wave disaster investigation, risk assessment and the production of analysis products. It takes its terms from GB/T 14914.2 and GB/T 15920, which it quotes.
Forecasting centres and marine survey bodies use it. Issued on 30 December 2022, it has applied since 1 April 2023.
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Document preview — GB/T 42176-2022
National Standard of the People's Republic of China
- ICS
- 07.060
- Classification
- A 45
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
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 for Standardization Documents" drafting.
1 Scope
This document specifies the classes of waves for wave observations and forecasts.
This document is applicable to wave observation, forecasting, warning and wave disaster investigation, risk assessment and production of analysis products, etc.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 14914.2 Specifications for Ocean Observation Part 2: Coastal Observation
GB/T 15920 Oceanographic Terminology Physical Oceanography
3 Terms and Definitions
The following terms and definitions defined in GB/T 14914.2 and GB/T 15920 apply to this document.
3.1 Ocean wave
Waves in the sea caused by wind. [Source: GB/T 15920-2010, 2.4.1]
3.2 Wave level grade of wave height
The scale reflecting the wave height of ocean waves is determined according to the wave height on the sea surface.
3.3 Wave height
The height difference between adjacent peaks and troughs on a wave profile. [Source: GB/T 15920-2010, 2.4.9]
3.4 1/3 height of highestone-thirdwave
Arrange the sequence of wave heights measured continuously in a certain period of time from large to small, and take the average value of the first 1/3 wave heights after sorting. [Source: GB/T 15920-2010, 2.4.36]
3.5 1/10 height of highestone-tenthwave
Arrange the sequence of wave heights measured continuously in a certain period of time from large to small, and take the average value of the first 1/10 wave heights after sorting. [Source: GB/T 15920-2010, 2.4.37]
3.6 Whitecap
When the wind and wave steeply exceed the limit, the white spray phenomenon occurs when the wave breaks.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 14914.2-2019 — The specification for marine observation - Part 2 :Offshore observation
GB/T 15920-2010 — Oceanographic terminology - Physical oceanography
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