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引用本文:唐昌新,熊雄,邬年华,张晓航,邹文楠.长江倒灌对鄱阳湖水动力特征影响的数值模拟.湖泊科学,2015,27(4):700-710. DOI:10.18307/2015.0419
TANG Changxin,XIONG Xiong,WU Nianhua,ZHANG Xiaohang,ZOU Wennan.Simulation of the impact of the reverse flow from Yangtze River on the hydrodynamic process of Lake Poyang. J. Lake Sci.2015,27(4):700-710. DOI:10.18307/2015.0419
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长江倒灌对鄱阳湖水动力特征影响的数值模拟
唐昌新1, 熊雄1, 邬年华2, 张晓航3, 邹文楠1
1.南昌大学工程力学研究所\高等研究院, 南昌 330031;2.江西省水利科学研究院, 南昌 332029;3.南昌工程学院理学院, 南昌 330099
摘要:
长江水倒灌是鄱阳湖的一个重要现象,是江湖作用的具体体现.利用环境流体动力学开源代码(EFDC)建立鄱阳湖的二维水动力模型,并借助染色剂模块和水龄模块,分析鄱阳湖全年的水动力变化过程、倒灌现象及其影响.数值模拟结果精确地验证倒灌的发生、持续时间和倒灌流量,显示倒灌时期湖区水力梯度、湖流逆向的特点.顶托作用强于鄱阳湖盆地作用时是倒灌发生的条件,通过计算倒灌发生的临界流量并与实际来流进行对比,本文提出新的倒灌判定条件,可以准确地预测倒灌和预估倒灌流量,且利用20072009年的测量数据验证了其可靠性.通过在赣江入流设置染色剂的方法,模拟获得2008年4次倒灌入流水体在湖区的占据面积.顶托作用和倒灌造成湖水不能外泄甚至逆流,增加湖区水体的水龄,通过数值模拟并与水力停留时间进行对比,估算出湖湖水水龄的增加时间.
关键词:  鄱阳湖  长江倒灌  水动力分析  EFDC  水龄
DOI:10.18307/2015.0419
分类号:
基金项目:长江倒灌对鄱阳湖水动力特征影响的数值模拟水利部行业专项项目(201001056)资助.
Simulation of the impact of the reverse flow from Yangtze River on the hydrodynamic process of Lake Poyang
TANG Changxin1, XIONG Xiong1, WU Nianhua2, ZHANG Xiaohang3, ZOU Wennan1
1.Institute of Engineering Mechanics/Institute for Advanced Study, Nanchang University, Nanchang 330031, P.R.China;2.Jiangxi Provincial Institute of Water Sciences, Nanchang 330029, P.R.China;3.School of Science, Nanchang Institute of Technology, Nanchang 330099, P.R.China
Abstract:
The reverse flow from the Yangtze River is an important phenomenon of the Lake Poyang, embodying the interaction between river and lake. In this paper, a 2D model of the Lake Poyang based on the Environmental Fluid Dynamics Code(EFDC) is established to study the hydrodynamic process, and the reverse flow from the Yangtze River is investigated in favor of the dye module and water age module.The reverse flow appears when the blocking effect of the Yangtze River becomes stronger than the basin effect of Lake Poyang. By calculating the critical flux of the reverse flow and contrasting it with the observed inflow,we propose a new discriminated condition for the reverse phenomenon,which can accurately predict the occurrence and estimate the flux of reverse flow,as validated by the observed data of three years from 2007 to 2009.Using this method to set colouring agent at the inflow of the Ganjiang River, the occupying areas from the Yangtze River are obtained by the simulation of 2008. The blocking effect and the reverse flow of Yangtze River are found to enlarge the water age by preventing the outflow of water from the lake, and the increased time can be estimated by comparing the simulated water age with hydraulic retention time.
Key words:  Lake Poyang  reverse flow from Yangtze River  hydrodynamic simulation  EFDC  water age
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