杭州湾北岸临港新片区岸段潮滩沉积特征  

Tidal flats sedimentary characteristics of Lingang Special Area in the northern bank of Hangzhou Bay

作　　者：章馨谣 戴志军[1] 魏稳 陈云[1] 张敏 ZHANG Xinyao;DAI Zhijun;WEI Wen;CHEN Yun;ZHANG Min(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;School of Marine Engineering and Technology,Sun Yat-Sen University,Zhuhai 519082,China;School of Environmental and Geographical Sciences,Shanghai Normal University,Shanghai 200234,China)

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200241 [2]中山大学海洋工程与技术学院,广东珠海519082 [3]上海师范大学环境与地理科学学院,上海200234

出　　处：《海洋通报》2022年第5期556-563,共8页Marine Science Bulletin

基　　金：国家自然科学基金委员会-中华人民共和国水利部-中国长江三峡集团有限公司长江水科学联合基金(U2040202);国家自然科学基金(42171282);上海市科委项目(20dz1204701)。

摘　　要：中国(上海)自由贸易试验区临港新片区(以下简称“新片区”)是我国第一个也是目前唯一的特殊综合保税区,该区域南部为杭州湾北岸区段,是新片区重要的出海和码头集中区。研究该岸段潮滩的沉积变化过程对新片区港工建筑及海堤稳定具有重大意义。基于此,本文利用2006年12月和2020年12月临港新片区杭州湾北岸区段采集的潮滩表层沉积物样品以及地形资料,分析人类活动加剧及长江水沙量减少背景下该区域沉积格局演变。结果显示:(1)临港新片区南部潮滩表层沉积物粒径较细,类型主要为粉砂和砂质粉砂,分选性差,属正偏态,峰度较窄。(2)2020年12月沉积物相较于2006年分选性变差、正偏程度增大、峰度变宽;芦潮港-中港沉积物粒径粗化,中港-金汇港沉积物颗粒变细。(3)2006-2020年新片区内整体以冲刷为主,岸滩安全面临威胁。芦潮港-中港与中港-金汇港区域沉积地貌变化差异明显,冲刷区域沉积物粗化,淤积区沉积物颗粒变细。Lingang Special Area of the China(Shanghai)Pilot Free Trade Zone(the Special Area)is the first and unique special comprehensive bonded zone in China.The southern part of this area located at the northern bank of Hangzhou Bay,which is an important estuary and dock concentration area.It is of vital significance to understand the sedimentary changes of the tidal flat for the port construction and seawall stability.Therefore,based on the surface sediment samples collected from the Lingang Special Area in December 2006 and December 2020 and bathymetric data,the evolution of sedimentary patterns under the background of increasing human activities and decreasing water and sediment of the Yangtze River were analyzed.The main results show that:(1)The grain size of tidal flat sediment in Lingang Special Area is generally small,and silt and sandy silt is the main sediment types in this area.The sediments has poor sorting,positive skewness and narrow kurtosis.(2)In comparisons with those in 2006,the tidal flat sediments showed significant differences in December 2020,sediments sortability deteriorated,the degree of positive deviation increased,and the kurtosis became wider.The grain size of the sediment in different regions showed distinct characteristics:Luchao Port-Zhonggang particle size in sediments coarsened,while the sediments from Zhonggang-Jinhui Port become finer.(3)From 2006 to 2020,the tidal flat in the Special Area experienced mainly erosion,and the local bank is faced with potential risks.The sediment in the scour area became coarser,while thinner in the siltation area.

关 键 词：临港新片区 杭州湾北岸 粒度参数 沉积格局 

分 类 号：P736.21[天文地球—海洋地质]