Keywords Degradation;armoring;stream tube model;numerical modeling;channel curvature;transverse bed slope;Efficient Element Method;morphodynamics;free surface flow, depth-averaged model.;

• 冲刷;床沙粗化;流管模型;数值模拟;河道弯曲;河床横向坡度;高效单元;形态动力;自由水面;水深平均模型;