大规模围垦后磨刀门河口沉积环境演变分析  

Processes of sedimentary environment in the Modaomen Outlet after large-scale reclamation

作　　者：陈晖 谭超[1,2,3] 黄本胜 邱静[1,2,3] CHEN Hui;TAN Chao;HUANG Beng-sheng;QIU Jing(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;State and Local Joint Engineering Laboratory of Estuarine Hydraulic Technology,Guangzhou 510635,China;Guangdong Key Laboratory of Hydrodynamic Research,Guangzhou 510635,China)

机构地区：[1]广东省水利水电科学研究院,广东广州510635 [2]河口水利技术国家地方联合工程实验室,广东广州510635 [3]广东省水动力学应用研究重点实验室,广东广州510635

出　　处：《泥沙研究》2021年第3期64-71,共8页Journal of Sediment Research

基　　金：广东省重点领域研发计划项目(2019B111101002);广东省水利科技创新项目(2017-11);广东省水利科技创新项目重点项目(2015-08);广东省水动力学应用研究重点实验室开放研究基金资助项目(gdsky[2018]001)。

摘　　要：珠江磨刀门河口围垦始于20世纪60年代,至90年代末期整治基本完成后,磨刀门河口向海快速延伸,河口类型发生转换,沉积环境发生显著改变。基于2003年、2006年和2015年磨刀门河口表层沉积物数据,通过表层沉积物粒度参数的时空分布反演不同时期沉积动力环境与沉积物输运路径,揭示大规模围垦后磨刀门河口沉积环境演变过程。结果表明:粗颗粒沉积物主要分布于口门外浅滩,沉积物中值粒径逐渐变粗,分选系数增大,偏态发生反转;受人类活动影响,河口区沉积环境的水动力明显增强,动力条件更加复杂多变。输运趋势分析表明磨刀门河口沉积物输移发生变化,沉积中心向拦门沙前缘转移。The land reclamation at Modaomen Outlet of the Pearl River Estuary was conducted since the 1960s,to the early 1990s.The sedimentary dynamic environment of Modaomen outlet has changed significantly due to the influence of heavy human activities.Based on the grain size measurement of surficial sediment in the Modaomen Outlet in 2003、2006 and 2015,the new evolution mode of sedimentary environment in the Modaomen Outlet in new dynamic patterns were studied.Results show that the coarse particles mainly distributed in the region of mouth sediment bar.Median grain size of surficial sediment got coarser,the sorting coefficient became higher,and the skewness changed inversely.The ternary diagram indicated that the hydrodynamic was enhanced and the dynamic condition became more complex.Sand grain size trend analysis indicated that the sediment movement trend had changed,the deposit center moved to the front of mouth bar.

关 键 词：磨刀门 围垦 粒度参数 输运趋势 沉积环境 

分 类 号：TV148.3[水利工程—水力学及河流动力学]