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长江口南汇边滩冲淤变化规律与机制

, PP. 41-51

Keywords: 长江三角洲,潮滩,冲淤周期,河口河势,风暴,三峡工程,泥沙含量阈值

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Abstract:

根据1842—2004年海图资料分析发现,南汇边滩存在近百年尺度的强烈冲刷—淤积旋回。长江主泓走南港或北港是造成冲刷期"北滩、东滩淤积,南滩、过渡带冲刷"或淤积期冲淤态势反相的主要原因;冲刷期内风暴强度和频数明显多于淤积期,造成冲刷期滩面叠置记忆的是暴风浪成因的"高滩冲刷、低滩淤积"的冲淤态势,而淤积期保存的是弱风浪成因的"高滩淤积、低滩冲刷"叠置增强的剖面特征。尽管三角洲整体冲淤态势的转变主要受流域来沙量的控制,但不同岸段受河口河势分水分沙作用、潮流和波浪等共同作用,明显存在此冲彼淤、冲淤动态调整等特征。已有的入海泥沙含量阈值研究以点代面或以局部代整体,这是造成阈值估算偏高的主要原因。2003年三峡水库开始蓄水后平均年输沙量154Mt/a已低于低阈值184Mt/a,但三角洲尚未如预测那样发生由净淤积向净侵蚀的转变。已有的河口水文观察资料显示,水体含沙量也未发生明显下降,这可能是潮控型三角洲潮流对泥沙在河口的再分配起主导作用,并可能由此延长三角洲冲淤转变对入海泥沙量减少的滞后。今后需进一步加强潮控型河口复杂过程的综合研究,提高对泥沙含量阈值估算和应对可能面临的海岸侵蚀及其相关的环境地质灾害的能力。

References

[1]  HAY W W.Detrital sediment fluxes from continents to oceans [J].Chemical Geology,1998,145: 287—323.
[2]  STANLEY D J.Nile Delta: extreme case of sediment entrapment on a delta plain and consequent coastal land loss [J].Marine Geology,1996,129: 189—195.
[3]  KENNISH M J.Coastal salt marsh systems in the U.S.: a review of anthropogenic impacts [J].Journal of Coastal Research,2001,17: 731—748.
[4]  李从先,杨守业,范代读,等.三峡大坝建成后长江输沙量的减少及其对长江三角洲的影响[J].第四纪研究,2004,24(5): 495—500.
[5]  YANG Z,WANG H,SAITO Y,et al.Dam impacts on the Changjiang (Yangtze) River sediment discharge to the sea: the past 55 years and after the Three Gorges Dam [J].Water Resources Research,2006,42:w04407,doi:10.1029/2005WR003970.
[6]  宋晓红,石学法,蔡德陵,等.三峡截流后长江口秋季TSM,POC和PN的分布特征 [J].海洋科学进展,2007,25(2): 168—177.
[7]  中华人民共和国水利部.中国河流泥沙公报2007[Z].北京:中国水利水电出版社,2008:60.
[8]  YANG S L,BELKIN I M,BELKINA A I,et al.Delta response to decline in sediment supply from the Yangtze River: evidence of the recent four decades and expectations for the next half-century [J].Estuarine,Coastal and Shelf Science,2003,57: 689—699.
[9]  杨世伦,朱骏,李鹏.长江口前沿潮滩对来沙锐减和海平面上升的响应 [J].海洋科学进展,2005,23(2): 152-158.
[10]  陈吉余,陈沈良,丁平兴,等.长江口南汇咀近岸水域泥沙输移途径 [J].长江流域资源与环境,2001,10(2): 166—172.
[11]  李九发,戴志军,应铭,等.上海市沿海滩涂土地资源圈围与潮滩发育演变分析 [J].自然资源学报,2007,22(3): 361—371.
[12]  吴华林,沈焕庭,吴加学.长江口海图深度基准面换算关系研究 [J].海洋工程,2002,20(1):69—74.
[13]  恽才兴.长江河口潮滩冲淤和滩槽泥沙交换 [J].泥沙研究,1983,4: 43—521.
[14]  李九发.长江河口南汇潮滩泥沙输移规律探讨 [J].海洋学报,1990,12(1): 75—82.
[15]  FAN D D,GUO Y X,WANG P,et al.Cross-shore variations in morphodynamic processes of an open-coast mudflat in the Changjiang Delta: with an emphasis on storm impacts [J].Continental Shelf Research,2006,26: 517—538.
[16]  徐钢,陈吉余.长江河口海岸演变长周期波动的初步研究 [J].华东师范大学学报:自然科学版,1997(4): 64—71.
[17]  刘苍字,吴立成,曹敏.长江三角洲南部古沙堤(冈身)的沉积特征、成因及年代 [J].海洋学报,1985,7(1): 55—66.
[18]  陈吉余,徐海根.长江河口南支河段的河槽演变 //陈吉余,沈焕庭,恽才兴.长江河口动力过程和地貌演变.上海:上海科学技术出版社,1988.375—389.
[19]  火恩杰,刘昌森.上海地区自然灾害史料汇编 .北京:地震出版社,2002: 294.
[20]  刘曙光,李从先,丁坚,等.黄河三角洲整体冲淤平衡及其地质意义 [J].海洋地质与第四纪地质,2001,21(4): 13—17.
[21]  李九发,季中.长江来水来沙对河口南槽边滩冲淤变化的统计分析 [J].泥沙研究,1988(4): 76—82.
[22]  高抒.潮滩沉积记录正演模拟初探 [J].第四纪研究,2007,27(5): 750-755.
[23]  MILLIMAN J D,SHEN H,YANG Z,et al.Transport and deposition of river sediment in the Changjiang Estuary and adjacent continental shelf [J].Continental Shelf Research,1985,4: 37—45.
[24]  LI B H,LI C X,SHEN H T.A preliminary study on sediment flux in the Changjiang Delta during the postglacial period [J].Science in China:Series D Earth Sciences,2003,46(7): 743—752.
[25]  VRSMARTY C J,MEYBECK M,FEKETE B,et al.Anthropogenic sediment retention: major global impact from registered river impoundments [J].Global and Planetary Change,2003,39: 169—190.
[26]  SYVITSKI J P M.Supply and flux of sediment along hydrological pathways: research for the 21st century [J].Global and Planetary Change,2003,39: 1—11.
[27]  CARRIQUIRY J D,SNCHEZ A.Sedimentation in the Colorado River Delta and Upper Gulf of California after nearly a century of discharge loss [J].Marine Geology,1999,158: 125—145.
[28]  STONE R.Three Gorges Dam: into the unknown [J].Science,2008,321: 628—632.
[29]  陈吉余,徐海根.三峡工程对长江河口的影响 [J].长江流域资源与环境,1995,4(3): 242—246.
[30]  JIAO N,YAO Z,ZENG Y,et al.Ecological anomalies in the East China Sea: impacts of the Three Gorges Dam? [J].Water Research,2007,41: 1287—1293.
[31]  YANG S L,ZHANG J,XU X J.Influence of the Three Gorges Dam on downstream delivery of sediment and its environment implications,Yangtze River [J].Geophysical Research Letter,2007,34:L10401,doi:10.1029/2007GL029472.
[32]  GAO S,WANG Y P.Changes in material fluxes from the Changjiang River and their implications on the adjoining continental shelf ecosystem [J].Continental Shelf Research,2008,28: 1490—1500.
[33]  CHEN X.Changjiang(Yangtze) River Delta,China [J].Journal of Coastal Research,1998,14(3): 838—858.
[34]  CHEN X,ZONG Y.Coastal erosion along the Changjiang deltaic shoreline,China: history and prospective [J].Estuarine,Coastal and Shelf Science,1998,46: 733—742.
[35]  范代读.潮坪韵律沉积的形成和保存及沉积间断的定量分析 [M].上海:同济大学出版社,2007: 110.
[36]  陈吉余,程和琴,戴志军.河口过程中第三驱动力的作用和响应——以长江河口为例 [J].自然科学进展,2008,18(9): 994—1000.
[37]  时钟,陈吉余,虞志英.中国淤泥质潮滩沉积研究的进展 [J].地球科学进展,1996,11(6): 555—562.
[38]  陈沈良,谷国传,虞志英.长江口南汇东滩淤涨演变分析 [J].长江流域资源与环境,2002,11(3): 239—243.
[39]  付桂,李九发,戴志军,等.长江口南汇咀岸滩围垦工程潮流数值模拟研究 [J].海洋湖沼通报,2007(4): 47—54.
[40]  陈卫跃.潮滩泥沙输移及沉积动力环境——以杭州湾北岸、长江口南岸部分潮滩为例 [J].海洋学报,1991,13(6): 813—821.
[41]  刘苍字,虞志英.杭州湾北岸的侵蚀/淤积波及形成机制 [J].福建地理,2000,15(3): 12-15.
[42]  恽才兴,时伟荣,何青.长江口通海航道泥沙场动态分析[J].华东师范大学学报:长江口深水航道治理与港口建设专辑,1995,50—79.
[43]  陈吉余,潘定安,苏法崇,等.长江口北港河槽演变分析 //陈吉余,沈焕庭,恽才兴.长江河口动力过程和地貌演变.上海:上海科学技术出版社,1988.390—403.
[44]  许炯心.黄河三角洲造陆过程中的陆域水沙临界条件研究 [J].地理研究,2002,21(2): 163—170.
[45]  GAO S.Modeling the growth limit of the Changjiang Delta [J].Geomorphology,2007,85: 225—236.
[46]  沈焕庭.长江河口物质能量 [M].北京:海洋出版社,2001: 176.

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