The first phase of the Yangtze River Estuary South Channel Management Project
The first phase of the Yangtze River Mouth South Channel Management Project is located in the Yangtze River Mouth South Channel, which is an important component of the Yangtze River Mouth Channel system. The main construction content includes the construction of a 16 kilometer beach embankment downstream from the southern edge of Jiangya Nansha, dredging of a South Channel with a length of about 14 kilometers and a width of 600 meters, and equipping it with navigation aids and other related supporting facilities.
The Third Navigation Bureau actively applies the four new technologies. Introducing the MS-1000 real-time sonar monitoring system to achieve qualitative and quantitative analysis of the quality of underwater soft water drainage engineering; Develop new high-strength bagged sand bag materials, break through the traditional underwater filling height limit, and achieve domestic mass production; Conducting research on using dredged soil as bagged sand embankment material not only promotes resource intensive utilization, but also ensures the continuity of construction during the Yangtze River sand mining ban period and reduces safety risks during the typhoon season. Multiple innovative technologies have won awards such as the Ministry of Transport's Water Transport Engineering Method, Shanghai Advanced Operating Method Innovation Award, and utility model patents.
The project has won numerous honorary awards, including the 2019 Shanghai Customer Satisfaction Project, 2020 Shanghai Quality Project, 2020 Shanghai Practical Achievement Competition "Golden Cup Team" title, and 2024 China Water Transport Construction Industry Association Science and Technology First Prize, and has achieved the goal of a 100% engineering quality qualification rate.
After the completion of the project, a high-quality auxiliary channel with a length of 86 kilometers, a depth of 6 meters, and a width of 600 to 1000 meters will be added to the existing 12.5 meter deep water main channel at the mouth of the Yangtze River. This channel can meet the needs of 5000 ton ships for full load tidal navigation in both directions, as well as 10000 to 20000 ton ships for reduced load tidal navigation and large unloaded ships for downward tidal navigation, significantly improving the passage capacity of the Yangtze River estuary channel.
Shanghai Lingang Coastal Marine Ecological Restoration Project
The Shanghai Lingang Coastal Marine Ecological Restoration Project is located in the Lingang Coast section of Pudong New Area, Shanghai, with a total length of 17.05 kilometers. The marine functional area in the area is classified as a "reserved area" and is one of the most important original ecological wetlands in Shanghai. The project construction includes the construction of an oyster reef group, 1167 meters of ecological management and protection boardwalk, 1 ecological monitoring station, 2782 meters of wave dissipating dam restoration, 227000 square meters of flower protection rice grass treatment, as well as carbon flux towers and warning tide level site markers.
The transparent semi-circular body used for constructing oyster reef groups has a total volume of 20000 cubic meters, with a single semi-circular body weighing 12 tons. The Third Navigation Bureau has established a Quality Control (QC) team specifically for the installation of semi-circular bodies. The developed "transparent semi-circular block lifting device" has successfully applied for a patent, achieving semi-automatic decoupling and underwater visual positioning control during the lifting process, providing a valuable high-quality technical paradigm for similar projects.
As a pioneer in Shanghai's marine ecological restoration project, the project lacks experience in the management of Spartina alterniflora, the planting of mangroves and seagrass, and the release of benthic organisms. While exploring ecological governance and restoration plans in practice, the Third Navigation Bureau has always adhered to quality control and standardized management, actively summarized experience, and formed replicable acceptance management methods in relevant fields.
After the completion of the project, the ecological system structure of Shanghai's coastal wetlands has been further improved, making a positive contribution to Shanghai's dual carbon strategy of peaking carbon emissions by 2025 and achieving carbon neutrality by 2050, which is of great significance to the integrated development of the Yangtze River Delta. Its successful practice not only provides technical support for the marine ecological restoration project in Shanghai, but also has broad promotion prospects and strategic value. (Zhang Ying and Yang Shulin from the Third Navigation Bureau)