长江北支进口段演变特征及治理  

Evolution characteristics and treatment of inlet section of northern branch of the Yangtze River

作　　者：周良平[1] 周东泉[2] 杜德军[1] 夏云峰[1] 闻云呈[1] 李阳帆 ZHOU Liang-ping;ZHOU Dong-quan;DU De-jun;XIA Yun-feng;WEN Yun-cheng;LI Yang-fan(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Jiangsu Surveying and Design Institute of Water Resources Co.,Ltd.,Yangzhou 225009,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]江苏省水利勘测设计研究院有限公司,江苏扬州225009

出　　处：《水运工程》2022年第12期128-133,169,共7页Port & Waterway Engineering

基　　金：江苏水利科技项目(2020002、2020010);水利部三峡后续项目(126302001000200002);中央级公益性科研项目(Y222002)。

摘　　要：在历史演变分析的基础上,重点研究近年来长江北支进口段滩槽时空变化、成因和影响机制。利用数学模型,对进口段规划整治方案效果进行模拟研究。结果表明:受上游来水来沙条件变化、周边整治工程实施等综合影响,长江北支进口段拦门沙经历了舌状沙体→崇头暗沙→崇头沙的发展变化,北支进口入流条件恶化;沙体两侧深槽则呈现“十年河东、十年河西”交替变化的态势,目前主槽位于崇明侧,其走向与南支主流交角已达105°,主流流路极度弯曲。在北支中下段规划整治工程已实施的情况下,进口段的治理已成为北支兴衰的关键;北支进口段规划疏浚工程实施后,进口段流路有所归顺,北支分流比增加0.1%,工程实施有利于河势稳定,可达到治理目的。On the basis of historical evolution analysis,this paper focuses on the change,cause and effect mechanism of the the inlet section of the northern branch of the Yangtze River in recent years.This paper simulates and studies the effect of planning and remediation scheme of the inlet section by the mathematical model.The results show that,affected by the changes of runoff and sediment from the upper reaches and the implementation of the surrounding remediation projects,the sandbar in the inlet section of the northern branch of the Yangtze River has experienced the development and change of tongue-shaped sand body→Chongtou shoal→Chongtou sand,and the inflow conditions of the northern branch deteriorates.The deep troughs on both sides of the sand body show an alternating trend of“ten years east of river and ten years west of river”.The current main trough is located on the Chongming side,and its direction and the main flow of the south branch reaches an intersection angle of 105°,and the main flow path is extremely curved.Under the circumstance that most of the planned renovation projects in the middle and lower sections of the North Branch are implemented,the treatment of the entrance section becomes the key to the rise and fall of the North Branch.After the implementation of the planned dredging project for the entrance section of the North Branch,the flow path of the entrance section returns,and the diversion ratio of the North Branch increases 0.1%,the implementation of the project is conducive to the stability of the river and achieves the purpose of treatment.

关 键 词：崇明沙 舌状沙体 深槽交替 白茆沙 南强北弱 进口段疏浚 

分 类 号：U617[交通运输工程—船舶及航道工程]