Second sea-entering approach of Changjiang River: Tonglü Canal-planning of control dimensions, analysis of erosion and siltation and selection of outlet

Assume that the Tonglu Canal would be widened and deepened in which a water lock is constructed at the river side, and made open to the sea side.The canal's planned control dimensions are determined, and the erosion and siltation characteristics along the river (totally 81.8 km) are analyzed by the numerical calculation of one-dimensional unsteady flow and the relative standards.According to the data of the evolution, hydrology and sediment in the Xiaomiaohong Waterway, it is found reasonable to select the channel near the Xingang Gate as the second sea-entering approach.This paper is helpful in planning and designing the approach.