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GB/T 42417-2023Code of practice for assessment of water exchange capacity in sea bay (English PDF)

海湾水交换能力评价技术规程

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 23, 2023

Implementation date

September 1, 2023

Scope

GB/T 42417-2023 is the English-translated version of 海湾水交换能力评价技术规程.

GB/T 42417-2023 is the Chinese national code of practice for assessing how well the water in a sea bay is exchanged.

It lays down the general principles and then two assessment routes: a monitoring and evaluation method, with the choice of a method for calculating the average tidal volume, the preparation of basic data, the calculation of average tidal volume and average water exchange rate, and the rating of exchange capacity; and a simulation method, with hydrodynamic numerical simulation and its verification, convection-diffusion simulation of a conservative tracer, the average half-exchange time of the water body and the water exchange matrix.

It applies to bays, and other sea areas may use it for reference. Among the standards it quotes are GB/T 12763.1-2007 and GB 17378.2-2007. Issued on 23 May 2023, it has applied since 1 September 2023.

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Document preview — GB/T 42417-2023

National Standard of the People's Republic of China

ICS: 07.060; 13.060
Classification: Z 10

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 General principles
5 Monitoring and Evaluation Method
5.1 Scope of application
5.2 Basic procedure
5.3 Selection of average tidal volume calculation method
5.4 Basic data preparation
5.5 Calculation of average tidal volume
5.6 Calculation of average moisture rate
5.7 Evaluation of water exchange capacity
6 Simulation evaluation method
6.1 Scope of application
6.2 Basic procedure
6.3 Basic data preparation
6.4 Hydrodynamic numerical simulation and verification
6.5 Convective-diffusion numerical simulation of conservative tracer substances
6.6 Calculation of average half exchange time of water body
6.7 Calculation of water exchange matrix
6.8 Evaluation of water exchange capacity
Reference

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 establishes the general principles for the evaluation of bay water exchange capacity, and specifies the basic procedures for monitoring and evaluation methods and simulation evaluation methods, Operating instructions, and methods for evaluating bay water exchange capacity.

This document is applicable to the evaluation of the water exchange capacity of bays, and can be referred to for the evaluation of water exchange capacity in other sea areas.

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 12763.1-2007 Marine survey specification Part 1: General principles

GB/T 12763.2-2007 Marine Survey Specification Part 2: Marine Hydrographic Observation

GB 17378.2-2007 Marine Monitoring Specification Part 2: Data Processing and Analysis Quality Control

GB/T 29726-2013 Technical Guidelines for Environmental Impact Assessment of Bay Reclamation Planning

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Bay seabay

The area of the water area is not less than the area of a semicircle whose diameter is the width of the mouth and is surrounded by land. [Source: GB/T 18190-2017, 2.1.26, modified]

3.2 Assessment sea area

The bay or part of the sea within the bay to be assessed.

3.3 Spring tide

One to three days after the first and fifteenth day of each month, the tide with a large tidal range is formed by the addition of the tides caused by the moon and the sun. [Source: GB/T 15920-2010, 2.5.12, modified]

3.4 Neaptide

The tide with small tidal range is formed by the subtraction of the tides caused by the moon and the sun around the seventh or eighth day or the 22nd or 3rd day of each month. [Source: GB/T 15920-2010, 2.5.13, modified]

3.5 Intertidal zone

Between the high tide line and the low tide line, the seawater periodically submerges and withdraws from the shoal area. [Source: GB/T 18190-2017, 2.1.11]

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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.

Referenced standards

Normative references

Similar standards

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