Authors suggest that the lower Luanhe river channel regulation should accord with the slightly sinuous channel, the design dicharge be 3 000m3/s, and the width of.

Taking the hinge of Wujiang River as the prototype,the model of hydro-complex in narrow reach with bend in valley is established.

Wujiang River belongs to a classical winding canyon river.

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.

An efficient numerical model for meandering rivers in the orthogonal curvilinear coordinates;

The results indicate that flow field in the bends of tidal estuary differs obviously from that in the bends of non-tide river,including the downstream increase of velocities in the estuarine bends,the bifurcation of mai.