To analyze the feature of dam-break flow in natural channel bends,channel-fitted orthogonal curvilinear coordinate system is established and two-dimensional shallow water equations are derived in this system through coordinate transformation,simplification and depth integration.

A finite element, method was adopted for weighted convergent mass establishing 2-D flow mathematical model in flow simulation of channel bends, by which the flow pattern of middle and lower channel bends of Li River in the discharge of water transportation was simulated and the calculated results of which concerning water level, flow velocity and discharge were coincident well with measured data.

In this paper, the bed form laws in channel bends are investigated.

Based on the rule of the ships through the inland curving channel and the characteristics of the intake mak-ing the ships navigation s influence,take a practical example as object of study,the ships get through security distance-a-beam computation model at inland curving channel concave bank intake place was established.

The flow state of airflow in the bend passages is analyzed.

According to the flow state of the fluid of the louver dewaterers in bend passages According to,the control equation and the boundary condition of the gas phase flows are determined.

Probing into the tubular turbine hydropower station construction and the navigation in closure period of navigable river;