天津南港工业区海区表层沉积物粒度特征及沉积环境分析
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摘要
通过对南港工业区毗邻海域采集的40个表层沉积物样品做粒度分析,结果表明:研究区大部分采样点沉积物为粘土质粉砂,仅有少数3个采样点为粉砂,1个采样点为砂质粉砂.又根据沉积物粒度参数特征,将研究区划分为3组沉积环境:I组沉积物平均粒径相对较大,沉积物砂含量较高,水动力为中低能,根据沉积物粒径和海域位置又分为受河流影响较强沿岸流影响较弱的沉积环境(I-1组)和受河流影响较小潮流影响较大的沉积环境(I-2组); II组为受较强河流水动力和潮流水动力双重影响的潮下带沉积环境; III组沉积物整体上颗粒较粗,水动力环境较为稳定,为受季节性湾内环流影响的沉积环境.另外,研究区西南岸潮间带向东北部,沉积物粒径变细,原因是西南岸河流将粗颗粒物质携带至潮间带,在河流和沿岸流共同作用下向北运行,受到南港工业区阻挡,粗粒沉积物沉积,细颗粒物质随水流反弹向南回流后,又在向北移动的环流作用下向东北方向移动,造成该海域沉积物偏细.
The grain size analysis of 40 surface sediments collected in the adjacent sea area of Tianjin Nangang Industrial Zone was analyzed. The results show that most of the sampling sites in the study area are clayey silt. Only three sampling sites are silt and one sampling site is sandy silt. According to the features of sediment grain size parameters,the study area can be divided into 3 groups that belong to 3 different depositional environments. In group I,the sediment average grain size is relatively large with high content of sand in the sediments where the hydrodynamic force is low and medium. Further,the sediment grain size and the location of sea area can be divided into two depositional environments according to the relative weak influences of river. That is the sedimentary environ-ment under the influence of multiple dynamics( I-1) and the sedimentary environment( I-2) affected strongly by the smaller tides and weakly affected by the river. In group II,the sedimentary environment in the subtidal zone is influenced by the hydrodynamic forces of the strong river and the tidal current hydrodynamics. In Group III,The sediments grain sizes are coarse sands and the hydrodynamic environment is relatively stable,which affects the sedimentary environment of the seasonal bay circulation. In addition,the intertidal zone in the southwest bank of the study area turned to the northeast,with the sediment grain size becoming smaller. The reason is that the coarsegrained matter was carried to the intertidal zone by the river in the southwest bank,Under the joint action of rivers and coastal currents,they run northwards and are blocked by Nangang Industrial Zone. Deposits of coarse sediments,fine-grained particles flow back to the south with the rebound of the water flow and then move to the northeast direction under the current of northward movement,resulting in the sediment particles of the sea area thinning.
The grain size analysis of 40 surface sediments collected in the adjacent sea area of Tianjin Nangang Industrial Zone was analyzed. The results show that most of the sampling sites in the study area are clayey silt. Only three sampling sites are silt and one sampling site is sandy silt. According to the features of sediment grain size parameters,the study area can be divided into 3 groups that belong to 3 different depositional environments. In group I,the sediment average grain size is relatively large with high content of sand in the sediments where the hydrodynamic force is low and medium. Further,the sediment grain size and the location of sea area can be divided into two depositional environments according to the relative weak influences of river. That is the sedimentary environ-ment under the influence of multiple dynamics( I-1) and the sedimentary environment( I-2) affected strongly by the smaller tides and weakly affected by the river. In group II,the sedimentary environment in the subtidal zone is influenced by the hydrodynamic forces of the strong river and the tidal current hydrodynamics. In Group III,The sediments grain sizes are coarse sands and the hydrodynamic environment is relatively stable,which affects the sedimentary environment of the seasonal bay circulation. In addition,the intertidal zone in the southwest bank of the study area turned to the northeast,with the sediment grain size becoming smaller. The reason is that the coarsegrained matter was carried to the intertidal zone by the river in the southwest bank,Under the joint action of rivers and coastal currents,they run northwards and are blocked by Nangang Industrial Zone. Deposits of coarse sediments,fine-grained particles flow back to the south with the rebound of the water flow and then move to the northeast direction under the current of northward movement,resulting in the sediment particles of the sea area thinning.
引文
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[17]商志文,王宏,李效广.渤海湾西岸南大港、北大港中晚全新世潟湖底板虚拟重建[J].地质通报,2005,24(7):672-676.
[18]成都地质学院陕北队.沉积岩(物)粒度分析及应用[M].北京:地质出版社,1976.
[19]刘世昊,丰爱平,李培英,等.现代黄河三角洲地区晚更新世以来高分辨率沉积粒度特征及动力沉积环境演化[J].第四纪研究,2015,35(2):291-306.
[20] PASSAGA R. Grain size representation by C-M pattern as a geologic tool[J]. Journal of Sedimentary Petrology,1964,34:830-847.
[21]任明达,王乃梁.现代沉积学概论[M].北京:科学出版社,1981.
[2]刘建国,李安春,徐兆凯.全新世以来渤海湾沉积物的粒度特征[J].海洋科学,2006,30(3):60-65.
[3]陈洪全,彭俊,陈沈良,等.苏北废黄河三角洲海域表层沉积物粒度的空间变异和分布特征[J].应用海洋学学报,2014,33(4):574-580.
[4]田立柱,耿岩,裴艳东,等.渤海湾西部表层沉积物粒度特征与沉积混合[J].地质通报,2010,29(5):668-674.
[5]魏飞.渤海湾西部表层沉积物粒度和黏土矿物特征及物源分析[D].青岛:中国海洋大学,2013.
[6]冯秀丽,魏飞,刘杰,等.渤海湾西部表层沉积物粒度及黏土矿物特征分析[J].海洋科学,2015,39(8):70-77.
[7]李琰,胡克,王萍,等.大连复州湾底质沉积物粒度特征与沉积环境分析[J].海洋学研究,2013,31(3):41-48.
[8]裴艳东,王云生,范昌福,等.天津市潮间带表层沉积物的类型及其分布[J].地质通报,2009,28(7):915-922.
[9]项立辉,安成龙,张晓飞,等.连云港近岸海域表层沉积物沉积特征及粒径趋势分析[J].应用海洋学学报,2015,34(3):317-325.
[10] GAO S,COLLINS M. A critique of the“McLaren Method”for defining sediment-transport paths-discussions[J]. Journal of Sedimentary Petrology,1991,61(1):143-146.
[11]中国科学院海洋研究所.渤海地质[M].北京:科学出版社,2008.
[12]施建堂.渤海湾西部现代沉积[J].海洋通报,1987,6(1):22-26.
[13]刘兴泉,廖经榜,季仲贞.渤海冬季环流的指数研究[J].大气科学,1989,13(3):280-288.
[14]杨作升,孙宝喜,沈渭铨.黄河口毗邻海域细粒级沉积物特征及沉积物入海后的运移[J].山东海洋学院学报,1985,15(2):121-128.
[15]赵宝仁,庄国文,曹德明,等.渤海的环流、潮余流及其对沉积物分布的影响[J].海洋与湖沼,1995,26(5):466-473.
[16]贾建军,高抒,薛允传.图解法与矩法沉积物粒度参数的对比[J].海洋与湖沼,2002,33(6):577-582.
[17]商志文,王宏,李效广.渤海湾西岸南大港、北大港中晚全新世潟湖底板虚拟重建[J].地质通报,2005,24(7):672-676.
[18]成都地质学院陕北队.沉积岩(物)粒度分析及应用[M].北京:地质出版社,1976.
[19]刘世昊,丰爱平,李培英,等.现代黄河三角洲地区晚更新世以来高分辨率沉积粒度特征及动力沉积环境演化[J].第四纪研究,2015,35(2):291-306.
[20] PASSAGA R. Grain size representation by C-M pattern as a geologic tool[J]. Journal of Sedimentary Petrology,1964,34:830-847.
[21]任明达,王乃梁.现代沉积学概论[M].北京:科学出版社,1981.