STUDY OF SEDIMENT GRAIN SIZES AND SOURCES FOR THE SHORT CORES COLLECTED FROM THE NORTH PASSAGE OF YANGTZE ESTUARY
-
摘要: 根据2014年1月北槽航道坝田区采集的13组浅钻柱状样(柱长为19~107 cm),着重分析了浅钻柱状样沉积物的粒度特性。研究结果表明:北槽上段和中段呈南粗北细的沉积物分布格局,南北侧沉积物中值粒径分别为29~40和14~18 μm;北槽下段南北两侧沉积物粗细差异趋同,中值粒径范围为23~27 μm。沿北槽纵向,南侧沉积物中值粒径和砂的含量自口内向口外呈减小趋势,而北侧正好与此相反,表明北槽内涨落潮流路分歧影响泥沙的沉积和分选。北槽柱状沉积物大多存在三组关键组分,即细组分7.8~26.3 μm、粗组分37.4~126.0 μm及更粗组分>193.5 μm,分别代表流域及海域来沙中的悬沙沉积、周围浅滩越堤供沙及风暴作用所致的泥沙沉积。其中粗组分37.4~126.0 μm为北槽坝田区沉积物的环境敏感组分。相关成果,从沉积的角度可以为深化研究长江口北槽深水航道的泥沙来源和淤积原因提供依据。Abstract: This work studies the properties of sediments from 13 short cores collected in the North Passage (NP) of the Yangtze Estuary in order to study the sediment sources. The results show that the sediment grain sizes exhibit strong spatial variations vertically and laterally. In the upper part of the NP, the median diameters (D50) of the sediments are 29~40 μm and 14~18 μm on the south and north sides, respectively. However, D50 is 23~27 μm on both sides of the lower part of the NP. Along the NP, both D50 and sand content decrease seaward on the south side, but increase seaward on the north side. The bifurcated ebbing and flooding currents in the NP is responsible for the spatial variations in sediment deposition and sorting. Moreover, there are three groups of sediments of grain sizes of 7.8~26.3 μm, 37.4~126.0 μm and>193.5 μm. They are representatives of varying sediment sources. Specifically, the fine sediment is the suspended load from the river and the sea, the coarse sediment is a kind of laterally transported sediment from the adjacent shoals to the NP, and the coarsest sediment is the lag deposits after storm surges. The coarse sediment is the most sensitive portion in the NP.
-
Key words:
- sediment core /
- grain size /
- sediment source /
- sensitive grain-size components /
- the North Passage
-
-
[1] 王兆华,杜景龙. 长江口深水航道一、二期工程建设以来北槽河段的冲淤演变[J]. 海洋通报,2006(6):55-62,84.
[WANG Zhaohua, DU Jinglong. Evolvement of the north passage after executing the deep-water channel project of Yangtze Estuary[J]. Marine Science Bulletin, 2006(6):55-62,84.]
[2] 郑宗生,周云轩,沈芳. GIS支持下长江口深水航道治理一、二期工程对北槽拦门沙的影响分析[J]. 吉林大学学报:地球科学版,2006(1):85-90.[ZHENG Zongsheng, ZHOU Yunxuan, SHEN Fang. A GIS supported study of the influence on the North Passage bar after executing Yangtze estuary deepwater channel regulation phase I &. Ⅱ project[J]. Journal of Jilin University:Earth Science Edition,2006
(1):85-90.]
[3] 潘灵芝,丁平兴,葛建忠,等. 长江口深水航道整治工程影响下北槽河床冲淤变化分析[J]. 泥沙研究,2011,05:51-59.[PAN Lingzhi, DING Pingxing, GE Jianzhong, et al. Analysis of influence of deep waterway project on morphological change in north passage of Changjiang Estuary[J]. Journal of Sediment Research,2011
(5):51-59.]
[4] 谢小平. 长江河口九段沙形成发展及演化规律研究[D].华东师范大学,2004.[XIE Xiaoping. Formation and law of evolution processes of the Jiuduansha Shoal of the Changjiang Shoal[D]. East China Normal University,2004.]
[5] 刘杰. 九段沙湿地自然保护区地理信息系统的开发与应用[D].华东师范大学,2006.[LIU Jie, Development and application of Jiuduansha wetland nature reserve geographic information system[D]. East China Normal University,2006.]
[6] 冯凌旋,李九发,刘新成,等. 近期长江河口南、北槽分流口河床演变过程研究[J]. 泥沙研究,2012(6):39-45.[FENG Lingxuan, LI Jiufa, LIU Xincheng,et al. Morphological evolution of diffluence pass of south passage and north passage in Yangtze Estuary and its response to diversion works[J]. Journal of Sediment Research,2012
(6):39-45.]
[7] 陈志昌,罗小峰. 长江口南港及南北槽分汊口河床形态特征研究[J]. 水利水运工程学报,2005(4):1-5.[CHEN Zhichang, LUO Xiaofeng. Study on riverbed fom of south channel and south-north-passage bifurcation in the Yangtze estuary[J].Hydro-Science and Engineering, 2005
(4):1-5.]
[8] 金镠,虞志英,何青. 深水航道的河势控制和航道回淤问题[J]. 中国港湾建设,2012(1):1-8.[JIN Liu, YU Zhiying, HE Qing. Study on river regime control and siltiation in deepwater channel[J]. China Harbour Engineering,2012
(1):1-8.]
[9] 刘猛. 长江口拦门沙河段波浪特征及对北槽航道回淤影响研究[C]//中国海洋工程学会.第十六届中国海洋(岸)工程学术讨论会(下册).中国海洋工程学会, 2013:7.[LIU Meng. Wave characteristics of Yangtze Estuary Mouth Bar and its impact on Siltiation in Deepwater Channel[C]//China Ocean Engineering, 2013:7.]
[10] 谈泽炜,范期锦,郑文燕,等. 长江口北槽航道回淤原因分析[J]. 水运工程,2009(6):91-102.[TAN Zewei, FAN Qijin, ZHENG Wenyang. Analysis of reasons for the siltation in north passage of Yangtze estuary[J].Port and Waterway Engineering, 2009
(6):91-102.]
[11] 季岚,王谷谦,周海. 1998年洪季长江口北槽下段航道淤浅原因分析[J].水运工程,1999,10:48-51.[JI Lan,WANG Guqian,ZHOU Hai. Analysis of the reasons for siltation at the downstream north channel of the Yangtze estuary during flood season of 1998
[J]. Port and Waterway Engineering, 1999,10:48-51.]
[12] 李贞. 广西海岸带孢粉组合特征及近百年来沉积环境演变[D].华东师范大学,2010.[LI Zhen. Palynological assemblage and environment evolution of the coastal zone within the last hundred years in Guangxi[D]. East China Normal University,2010]
[13] 陈桥,刘东艳,陈颖军,等. 粒级-标准偏差法和主成分因子分析法在粒度敏感因子提取中的对比[J]. 地球与环境,2013(3):319-325.[CHEN Qiao, LIU Dongyan, CHEN Yijun, et al. Comparative analysis of grade-standard deviation method and factors method for environmental sensitive factor analysis[J].Earth and Environment, 2013
(3):319-325.]
[14] 王宝灿,黄迎松. 海岸动力地貌[M].上海:华东师范大学出版社,1989.[WANG Baocan, HUANG Yingsong. Coastal Dynamic Geomorphology[M]. East China Normal University Press, 1989.]
[15] 虞志英,深水航道沿程河床演变[R]. 上海:华东师范大学,2014.[YU Zhiying. The riverbed evolution of deepwater channel[R].Shanghai:East China Normal University. 2014.]
[16] Boulay S, Colin C, Trentesaux A, et al. 19. Mineralogy and sedimentology of Pleistocene sediment in the South China Sea (ODP Site 1144)[R].Proc ODP Sci Results, 2003, 184(2):1-21.
[17] Allen G P. Relationship between size parameter distribution and current patterns in the Gironde Estuary(France)[J].Journal of Sedimentary Petrology,1971,41:74-88.
[18] 刘红. 长江河口泥沙混合和交换过程研究[D].华东师范大学,2009.[LIU Hong. Sediment mixing and exchange processes in the Yangtze estuary[D]. East China Normal University,2009.]
[19] 张迨. 长江口最大浑浊带水沙特性研究[D].华东师范大学,2014.[ZHANG Dai. The study on flow and sediment characteristics in the turbidity maximum of Changjiang estuary[D]. East China Normal University,2014.]
[20] 陈语,何青,张迨,等,长江口浑浊带枯季悬沙粒度分布特征[J]. 泥沙研究,2015,待刊.[CHEN Yu, HE Qing, ZHANG Dai, et al. The suspended sediment grain size distribution of Yangtze River estuary turbidity maximum in dry season[J]. Journal of Sediment Research,2015, Accepted.]
[21] 徐海根,虞志英,钮建定,等. 长江口横沙浅滩及邻近海域含沙量与沉积物特征分析[J]. 华东师范大学学报:自然科学版,2013(4):42-54.[XU Haigen, YU Zhiying, NIU Jianding, et al. Analysis of the suspended sediment concentration and sedimentation around the hengsha shoal of the Yangtze estuary and its adjacent region[J]. Journal of East China Normal University (Natural Science), 2013
(4):42-54.]
[22] 闫虹,戴志军,李九发,等. 长江口拦门沙河段潮滩表层沉积物分布特征[J]. 地理学报,2009,5:629-637.[YAN Hong, DAI Zhijun, LI Jiufa, et al. Distribution of surficial tidal flat sediments in the Yangtze estuary[J]. Acta Geographica Sinica, 2009
,5:629-637.]
[23] 刘红,何青,孟翊,等. 长江口表层沉积物分布特征及动力响应[J]. 地理学报,2007,1:81-92.[LIU Hong, HE Qing, MENG Yi,et al. Characteristics of surface sediment distribution its hydrodynamic responses in the Yangtze river and estuary[J]. Acta Geographica Sinica, 2007
,1:81-92.]
[24] 谢小平,王兆印,沈焕庭. 长江口九段沙现代潮滩沉积特征[J]. 沉积学报,2005,4:566-573.[XIE Xiaoping, WANG Zhaoyin, SHEN Huanting. Sedimentary characteristics of the modern tidal flat of jiuduansha shoal in Changjiang estuary[J]. Acta Sedimentologica Sinica, 2005
, 4:566-573.]
-
计量
- 文章访问数: 1070
- PDF下载数: 1
- 施引文献: 0
下载: