整治工程影响下分汊河口水动力变化研究

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英文篇名：Numerical modeling study of the hydrodynamical impact of the river regulation project in a bifurcated estuary 作者：缴健 ; 高祥宇 ; 丁磊 ; 罗勇 ; 张新周 英文作者：JIAO Jian;GAO Xiangyu;DING Lei;LUO Yong;ZHANG Xinzhou;Nanjing Hydraulic Research Institute;Key Lab.of Port Waterway and Sedimentation Engineering of the Ministry of Transport; 关键词：分汊河口 ; 整治工程 ; 数学模型 ; 水动力 ; 潮波不对称性 英文关键词：bifurcated estuary;;regulation project;;numerical model;;hydrodynamics;;tidal asymmetry 中文刊名：海洋工程 英文刊名：The Ocean Engineering 机构：南京水利科学研究院;港口航道泥沙工程交通行业重点实验室; 出版日期：2019-03-30 出版单位：海洋工程 年：2019 期：02 基金：国家重点研发计划(2017YFC0405400,2018YFC0407400);; 南京水利科学研究院基本科研业务费专项资金(Y218002) 语种：中文; 页：80-87 页数：8 CN：32-1423/P ISSN：1005-9865 分类号：U617

摘要

本文针对分汊河口一侧河道整治工程对工程汊及非工程汊水动力的影响问题,采用数学模型试验方法,建立了潮汐分汊河口概化数学模型,计算了整治工程(双导堤与丁坝)前后水动力变化,分析了主要分潮M2、M4的潮位、流速沿程变化规律以及工程后丁坝局部流速流向特征,讨论了潮波的变形及不对称性。结果显示,整治工程导致工程汊分流比减小,工程区域内流速增加,工程区外流速减小,非工程汊整体流速增加。工程汊的潮流变形及不对称性均较工程前有所增强,导致外海泥沙盐水通过航槽向上游上溯的距离更长,坝田区内流速明显小于航槽流速,并呈明显的旋转流态势,导致坝田淤积。
        A schematized numerical model of a bifurcated estuary is established to study the hydrodynamic impact of the river regulation project. The hydrodynamics variations before and after the project are calculated. The variation of the water level and current velocity amplitude of the main tidal component M2 and M4 tide along the branch are analyzed. At the same time,the characteristics of local current velocity and direction in the spur dike area after the project are analyzed. In addition,the tidal distortion and asymmetry before and after the project are discussed. The results show that,the regulation project leads to a decrease in the flow portion of the project branch,the flow rate in the project area increases while outside the project area decreases. The overall flow rate of the non-engineering branch increases. The tidal deformation and asymmetry of the engineering branch are enhanced compared with that before the project,which causes the offshore sediment and saltwater to travel more upstream. The current velocity in the dam sheltering area is significantly smaller than that in the channel,and it shows a rotating flow,which may lead to sediment siltation in this area.

引文

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