Evolution and regulation works at Hechangzhou braided channel in Z-Y Reach of Yangtze River

The Zhenjiang-Yangzhou(Z-Y) Reach is one of the most severely changing sections in the lower Yangtze River.To stabilize the river regime,the phase Ⅰ and phase Ⅱ regulation works have been implemented for years on this reach,resulting in the substantial control of severe change of regime.The behaviors of the inflow and sediment,the recent evolution rules and trend of the river channel in this section as well as the changing rules and causes of the change of the Hechangzhou brai-ded channel are analyzed and the scheme researches,engineering design,construction and the effects of the control works at the entrance of the left branch of the Hechang sandbar are presented in the paper.Measured data show that the regulation works of Hechangzhou braieled channel intrance has attained predicated effect.