长江口白茆沙汊道段近期河道演变分析

Analysis on Recent Evolution of Baimaosha Branch of Yangtze River Estuary

根据20世纪70年代以来长江口南支河段实测水下地形资料,全面分析了白茆沙汊道段近期河床演变特征。分析表明,白茆沙汊道近年来"南强北弱"的河势格局逐步加强,已引起下游河势的不利变化。应抓紧实施相关规划中的白茆沙治理及扁担沙护滩工程,控制白茆沙头的冲刷后退,减少白茆沙滩面的漫滩流以调整南、北水道的分流量,力求恢复并稳定南、北水道-10 m槽皆贯通的优良河势,减缓"南强北弱"趋势,为下游河势的稳定提供基础。

Based on the measured underwater topography data of Baimaosha branch since 1970 s,a comprehensive analysis on recent evolution characteristics of Beigang branch is carried out. The results show that： The river regime pattern of ＂south strong and north weak＂is gradually strengthened in recent years,and that has induced the unfavorable changes of the downstream river regime. Baimaosha governance regulation project and Biandansha beach protection engineering in relevant planning should be implemented quickly to control the Erosion and retreat of Baimaosha head,reduce the cross flow of beach face to adjust the shunt of south and north waterway,recover and stabilize excellent regime of that-10 m channel transfixion is through,slowdown the Trend of ＂south strong and north weak＂,and lay a foundation for downstream river regime stability.