数值分析径流变化对磨刀门咸潮上溯的影响  

Numerical Analysis on the Impact of Runoff Change on the Saltwater Intrusion at Modaomen Estuary

作　　者：刘祖发[1] 张泳华[1] 陈晓越[2] 杜尧东[3] 林若兰[1] 付雪莲 

机构地区：[1]中山大学水资源与环境研究中心,广州510275 [2]广州大学地理科学学院,广州510006 [3]广东省气候中心,广州510080

出　　处：《亚热带资源与环境学报》2017年第4期30-38,共9页Journal of Subtropical Resources and Environment

基　　金：2017中国气象局气候变化专项资助项目(CCSF201715)

摘　　要：径流量变化对咸潮上溯有直接影响。利用FVCOM模型对磨刀门水道的咸潮上溯现象进行模拟,针对径流变化设置敏感性试验,对上游河道水位上升后水动力的变化规律、固定点的表层盐度变化、盐度分层情况等进行数值分析,探讨径流变化引起的咸潮上溯变化。结果表明:河段水位整体上升,沿内河道至河口水面坡降增大。河道各层盐度大大减小,不同点的盐度分层程度不同。转潮时刻的表底层流态差异现象减弱,中下游流速分层更明显,流向分层更一致。The change in runoff has a direct effect on saltwater intrusion. The paper chooses FVCOM to simulate the saltwater intrusion of Modaomen channel and set a sensitivity test in view of the changing water level of upstream. The change regularity of hydrodynamic,the salinity and its stratification at some fixed stations are analyzed when the water level of upstream rises in order to figure out the change characteristics of the saltwater intrusion caused by the changing runoff. The simulation results show that： The water levels in whole channel also increase,and surface gradient increases along the channel to the bay too. The whole channel will be greatly reduced salinity on each layer and the extent of salinity stratification is different at different stations. Differences between flow pattern in bottom layer and the surface due to the exchange of the tide will be reduced. The stratification of flow rate becomes more obvious and the directions of flow on every layer become more consistent in the middle and lower reaches.

关 键 词：咸潮上溯 径流变化 磨刀门 数值分析 

分 类 号：P334.92[天文地球—水文科学]