摘要
磨刀门河口是珠江流域西江的主干入海口,20世纪80年代以来受到网河区无序采砂和磨刀门整治工程的双重影响,潮汐动力必然发生相应的调整。本文基于多年的水文资料,结合统计分析、调和分析和数值模拟的方法,对近五十年以来磨刀门河口的潮汐动力变化过程及其对人类活动的响应进行研究。结果表明,20世纪80年代以前,磨刀门河口总体上呈现出高、低潮位缓慢上升、潮差逐渐减小的趋势,潮汐动力变化呈现出径流优势型入海口门水道向海延展的自然演变趋势;20世纪80年代以来,网河区无序采砂使水位下降、诱使潮汐动力增强,磨刀门整治工程使水位上升、潮汐动力减弱,由于河口不同段受到人类活动以及外海潮汐多年变化和海平面上升的干扰程度不同,其潮汐动力变化呈现出不同特征。近口段受网河区无序采砂影响较大,水位下降,潮汐动力增强;河口段受两种人类活动的双重影响,水位上升,在整治工程期间(1983—1993)潮汐动力减弱,在整治工程后(1993—2003)受网河区无序采砂的影响潮汐动力增强;口外海滨段受外海潮汐多年变化和全球海平面上升以及整治工程的共同作用,水位上升,潮汐动力减弱.
The Modaomen Estuary is the main outlet of the Xijiang River,where large-scale human intervention occurred since the 1980 s,including sand excavation in the river network and estuarine regulation project,which inevitably caused the variation of tidal dynamics in the Modaomen Estuary.In this paper,we investigate the variation of tidal dynamics and its response to human intervention in recent 50 years by using statistical analysis and harmonic analysis on hydrological data,and hydrodynamic numerical simulation.The results reveal that the variation of tidal dynamics indicates a natural evolution trend of a river-dominated estuary,characterized by increase in tidal level and decrease in tidal range prior to the 1980 s.However,after the 1980 s sand excavation in the river network induced a decrease in tidal level and increase in tidal dynamics,while estuarine regulation project resulted in an increase in tidal level and decrease in tidal dynamics.In the inner estuary,tidal dynamics was more affected by sand excavation,with decrease in tidal level and increase in tidal dynamics.In the central estuary,tidal dynamics was affected by both sand excavation and estuarine regulation project,with increase in tidal level and decrease in tidal dynamics during the regulation project(1983-1993)but increase in tidal dynamics after the regulation project(1993-2003).In the outer estuary,tidal dynamics was co-affected by global sea-level rise and estuarine regulation project,with increase in tidal level and decrease in tidal dynamics.
作者
蒋陈娟
周佳楠
杨清书
JIANG Chenjuan;ZHOU Jianan;YANG Qingshu(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225127,China;Institute of Estuarine and Coastal Research,School of Marine Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;State and Local Joint Engineering Laboratory of Estuarine Hydraulic Technology,Zhuhai 519082,China;Guangdong Provincial Engineering Research Center of Coasts,Islands and Reefs,Zhuhai 519082,China)
出处
《热带海洋学报》
CAS
CSCD
北大核心
2020年第6期66-76,共11页
Journal of Tropical Oceanography
基金
国家重点研发计划(2016YFC0402601)
国家自然科学基金(41806104)~~。
