戴志军, 李为华, 李九发, 陈吉余. 特枯水文年长江河口汛期盐水入侵观测分析[J]. 水科学进展, 2008, 19(6): 835-840.
引用本文: 戴志军, 李为华, 李九发, 陈吉余. 特枯水文年长江河口汛期盐水入侵观测分析[J]. 水科学进展, 2008, 19(6): 835-840.
DAI Zhi-jun, LI Wei-hua, LI Jiu-fa, CHEN Ji-yu. Analysis of the saltwater intrusion in the Changjiang estuary during the flood season in extreme drought year[J]. Advances in Water Science, 2008, 19(6): 835-840.
Citation: DAI Zhi-jun, LI Wei-hua, LI Jiu-fa, CHEN Ji-yu. Analysis of the saltwater intrusion in the Changjiang estuary during the flood season in extreme drought year[J]. Advances in Water Science, 2008, 19(6): 835-840.

特枯水文年长江河口汛期盐水入侵观测分析

Analysis of the saltwater intrusion in the Changjiang estuary during the flood season in extreme drought year

  • 摘要: 基于2006年汛期10月长江干流大通水文站逐时水位流量资料和长江口区现场实测水文、盐度资料,探讨了特枯水文年份在大型水利枢纽调控影响下的长江口区汛期盐水入侵及其对淡水资源的影响。结果表明:①2006年汛期10月大潮期间,外海上溯至北支的咸潮强度较大,倒灌南支严重,导致观测期间陈行水库、宝钢水库河段不存在淡水资源;②北支高盐度的咸水倒灌主要经白茆沙北水道而进入南支,长江入海冲淡水则主要由白茆沙南水道下泄入南支,两股不同性质的水流在白茆沙尾部汇合,其影响范围可到南港吴淞口;③观测期间,外海高盐水团经南北槽上溯,其强度和上溯距离可影响到吴淞口,致使除吴淞口附近水域存在淡水资源外,南港吴淞口以下河段皆为高盐水体覆盖。

     

    Abstract: Based on the hourly discharge records at the Datong station and the measured data of hydrology and salinity in the Chan自fang estuary during the flood season in the extreme drought 2006 coinciding with the operation of the large hydropower engineering,the characteristics of the saltwater intrusion and the changes of the freshwater caused by the saltwater intrusion are discussed.The results show that:① During the extreme drought year,the intensity of both the saltwater intrusion in the north branch and the inverse intrusion into the Ruth Branch is strengthened in the period of the spring tide,especially in Oct.2006,which resins from the absence of the freshwater in the river segments of Chenghang reserwir and Baogang resemvir;② The main way of inversed intrusion of the saltwater in the north branch goes clearly via the north channel of Baimaosha into the south branch,and the diluted water in the Chan自fang River evidently from the south channel of Baimaosha to the south branch.The flowing water from these different ways meets in the back of the Baimaosha and extends over the region of the Wusong inlet;And ③ because the region of the Wusong inlet is affected by the action of the saltwater intrusion from the north passage and the south passage,freshwater resource can be found there.Iwever,the seaward segment of the Wusong inlet is covered by the high saltwater body.

     

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