Protection Measures on Water Quality in Yellow-River-Crossing Tunnel

Abstract

The Yellow-River-Crossing Project is a special symbolic water conveyance structure in the middle route of the main canal. Its scenic environment surface sensory and water quality safety are equally important. Under the guarantee of the water quality monitoring station network designed, the water quality of the inlet and outlet of the tunnel reaches environmental quality standards II for the surface water. The deterioration of organic matter seriously endangers the safety of water quality. Floating cleaning has become a part of the daily routine. In view of the shortcomings of traditional long-rod net fishing such as great difficulty, high operational risk factor and low efficiency, and the characteristics of many floating species, large volume and concentration in the catchment area in front of the safety barrier at the entrance of the Yellow-River-Crossing Tunnel Project, an automatic fishing barrier was developed and installed. An environmental-friendly floating operation platform was equipped at the outlet of the tunnel, considering the large difference between the platform and the water and as a window for external exchange and display. The floating mat can beautify the environment and provide an emergency operation platform for handling hydraulic oil leakage and accidents at the inlet and outlet of the tunnel. It provides a practical reference for the salvage mechanization of the Project and the floating materials cleaning of the inverted siphon and aqueduct structures in the Project.