A SCENARIO FOR BENEFICIAL USES OF MATERIAL FROM MAINTENANCE DREDGING AT YANGSHAN PORT

摘要

Located in the north of the mouth of the Hangzhou Bay and to the southeast of Shanghai, the Qiqu Archipelago is a large group of islands near to Shanghai, comprising dozens of islands and featuring natural deepwater waterfront. Backing on to the Qiqu Archipelago, Yangshan Port is a typical offshore sea port connected to the mainland by a bridge (East China Sea Bridge). The water body at the port has a characteristically high sediment concentration and high current velocities owing to strong local tides and being adjacent to the Changjiang Estuary which is abundant in incoming water and sediment. Thus, it can be expected that there will be several million cubic metres of material from maintenance dredging at the port requiring to be used beneficially or disposed of every year after the Port comes into service. This paper discusses in detail the possible beneficial uses of the material from maintenance dredging at Yangshan Port in the following aspects: appropriate maintenance dredging methods, environmental requirements for material treatment and suitability of locations within the port for material treatment. Consideration was given to the plan form of the port, sites where the maintenance dredging will be carried out, soil strength and the requirements for sustainable development.