GB/T 39418-2020.Grades of storm surge.
1 Scope
GB/T 39418 specifies the classification method of storm surge intensity grade, high tide level super warning grade and storm surge disaster grade.
GB/T 39418 is applicable to storm surge forecast, storm surge assessment, related information release and other work.
2 Normative references
The following documents are indispensable for the application of this document. For all dated references, only the dated version applies to this document. For all undated references, the latest version (including all amendments) applies to this document.
GB/T 15920-2010 Oceanographic terminology Physical oceanography
GB/T 17839-2011 Specification for determination of warning tide level
3 Terms and definitions
The terms and definitions defined in GB/T 15920-2010 and GB/T 17839-2011 and the following terms and definitions apply to this document.
3.1
Storm surge
The local sea surface oscillation or non-periodic abnormal rise (lowering) phenomenon caused by strong winds and sudden changes in air pressure accompanying the passage of storms such as tropical cyclones, extratropical weather systems, and marine squall lines.
Note: The local sea surface oscillation or non-periodic abnormal rise phenomenon in storm surge is called storm surge, or simply surge; the local sea surface oscillation or non-periodic abnormal lowering phenomenon in storm surge is called storm reduction, or simply reduction.
[GB/T 19721.1-2017, definition 3.1]
3.2
peak surge
The maximum value of hourly surge during a storm surge, also known as the maximum storm surge.
[GB/T 19721.1-2017, definition 3.2]
3.3
warning tidal level
A tidal level threshold. When the tidal level reaches this threshold, the coast may be in danger and must be on alert to prevent tidal disasters.
[GB/T 19721.1-2017, definition 3.3]
3.4
​​ intensity of storm surge
The magnitude of the maximum storm surge during a storm surge.
3.5
Hazard degree of storm surge
The potential degree of disaster caused by storm surge, the value of which is calculated and divided by storm surge intensity and high tide level exceeding warning level.
This standard specifies the division method of storm surge intensity level, high tide level exceeding warning level and storm surge hazard level. This standard is applicable to storm surge forecast, storm surge assessment, related information release and other work.

ICS07.060
National Standard of the People's Republic of China
GB/T39418—2020
Storm surge grades
Grades of storm surge
Issued on 2020-11-19
State Administration for Market Regulation
National Standardization Administration
Implementation on 2021-06-01
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard was proposed by the Ministry of Natural Resources of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Marine Standardization (SAC/TC283). Drafting unit of this standard: National Marine Environmental Forecast Center. GB/T39418—2020
Main drafters of this standard: Dong Jianxi, Liang Sendong, Li Tao, Liu Qiuxing, Wu Shaohua, Fu Cifu, Fu Xiang, Li Mingjie, Liu Shichao
GB/T39418—2020
Disaster statistics of the China Marine Disaster Bulletin show that storm surge disasters account for about 90% of all marine disaster losses. The preparation of this standard is conducive to standardizing storm surge evaluation, storm surge disaster assessment and other related work, and better serving the safety of people's lives and property and social and economic construction.
1 Scope
Storm surge level
GB/T39418—2020
This standard specifies the division method of storm surge intensity level, high tide level super warning level and storm surge disaster level. This standard is applicable to storm surge forecast, storm surge assessment, related information release and other work. Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated versions apply to this document. For undated references, the latest versions (including all amendments) apply to this document GB/T15920—2010 Oceanographic terminology Physical oceanography GB/T17839—2011
3 Terms and definitions
Specifications for determination of warning tide levels
Terms and definitions defined in GB/T15920-2010 and GB/T17839-2011 and the following terms and definitions apply to this document 3.1
stormsurge
Storm surge
The phenomenon of local sea surface oscillation or non-periodic abnormal rise (lowering) caused by strong winds and sudden changes in air pressure accompanying the passage of tropical cyclones, temperate weather systems, sea-trails, etc. Note: The phenomenon of local sea level oscillation or non-periodic abnormal rise in storm surge is called storm surge, or surge for short; the phenomenon of local sea level oscillation or non-periodic abnormal decrease in storm surge is called storm reduction, or reduction for short. [GB/T19721.1—2017, Definition 3.1]
Maximum storm surge
peak surge
The maximum value of hourly surge in a storm surge is also called maximum storm surge. [GB/T19721.1—2017, definition 3.2]
warning tidal levelbzxZ.net
Warning tidal level
A tidal level threshold. When the tide level reaches this value, dangerous situations may occur along the coast and people must enter a state of alert to prevent tidal disasters. [GB/T19721.1—2017, definition 3.3]3.4
intensityof stormsurge
Storm surge intensity
The magnitude of the maximum storm surge during a storm surge. 3.5
Hazard degree of storm surge
Hazard degree of storm surge The possible disaster degree of storm surge is calculated and divided by storm surge intensity and high tide level super warning degree level. 1
GB/T39418—2020
4 Level division
4.1 Division principle
The division of storm surge level (storm surge intensity level, high tide level super warning degree level and storm surge hazard level) follows the principles of scientificity, rationality and applicability.
Storm surge intensity level
Based on the maximum storm surge, the storm surge intensity is divided into five levels: extra strong, strong, relatively strong, medium and general, corresponding to levels I, II, III, IV and V, respectively, as shown in Table 1.
Table 1 Storm surge intensity level
Maximum storm surge h./cm
I (extremely strong)
h,>250
High tide level super warning level
4.3.1 Warning tide level value is a single value
I (strong)
200
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