Perfect morphology of meandering river for middle and lower reaches of Hanjiang River

Based on field data and former research,the perfect morphology of meandering river is studied.The perfect morphology of meandering river was influenced not only by flow conditions including flow discharge and slope of river,but also influenced by the constitute and median diameter of river bed.The expression of curvature semidiameter is formed.Based on the field data of the middle and lower reaches of the Hanjing River,an empirical formula is developed.This empirical formula may be helpful both in river engineering and waterway improvement.