Sources for saltwater intrusion at the water intake of Qingcaosha Reservoir in the Changjiang Estuary
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摘要: 应用改进的三维数值模式ECOM-si,从模式计算的盐度和流向的变化过程、涨憩和落憩时刻盐度等值线和淡水区域的变化,分析在一般动力条件下青草沙水库取水口盐水入侵来源。计算结果表明,小潮后中潮、大潮、大潮后中潮和小潮期间北支倒灌占青草沙水库取水口表层盐水入侵比例分别为69.5%、89.3%、98.5%和99.5%,占底层盐水入侵比例分别为34.9%、88.9%、98.5%和99.5%。除了小潮后中潮期间底层盐水入侵来源主要来自下游外海(占65.1%),青草沙水库取水口表层和底层盐水入侵来源主要来自北支盐水倒灌,尤其是大潮后中潮和小潮期间几乎全部来自北支盐水倒灌。Abstract: Based on temporal variation of the simulated salinity and current direction,change of the isohaline and freshwater zone at flood slack and ebb slack,this study used the modified numerical 3-D model ECOM-si to analyze sources of saltwater intrusion at the water intake of Qingcaosha Reservoir under normal dynamic condition. The modeled results showed that saltwater-spill-over from the North Branch into the South Branch(SSO) accounts for 69.5%,89.3%,98.5% and 99.5% of the surface saltwater intrusion at the water intake of the Qingcaosha Reservoir during moderate tide following neap tide,spring tide,moderate tide following spring tide and neap tide,respectively,and 34.9%,88.9%,98.5%,99.5% of the bottom saltwater intrusion at the water intake of the reservoir during the same four-type tides mentioned above. Except for the bottom saltwater intrusion mainly from downstream open sea (accounts for 65.1%) during moderate tide following neap tide,the source of the saltwater intrusion at surface and bottom layer at the water intake of the reservoir is mainly from the SSO,especially during moderate tide following spring and neap tide.
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Key words:
- Qingcaosha Reservoir /
- saltwater intrusion /
- source /
- numerical simulation
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乐勤,关许为,刘小梅,等. 青草沙水库取水口选址与取水方式研究[J]. 给水排水,2009(2): 46-51. 沈焕庭,茅志昌,朱建荣. 长江河口盐水入侵[M]. 北京: 海洋出版社,2003:16. Li L,Zhu J R,Wu H. Impacts of wind stress on saltwater intrusion in the Yangtze Estuary[J]. Science China Earth Sciences,2012,55(7): 1178-1192. 朱建荣,傅利辉,吴辉. 风应力和科氏力对长江河口没冒沙淡水带的影响[J]. 华东师范大学学报:自然科学版,2008(6): 1-8. 项印玉,朱建荣,吴辉. 冬季陆架环流对长江河口盐水入侵的影响[J]. 自然科学进展,2009,19(2): 192-202. 茅志昌,沈焕庭,肖成献. 长江口北支盐水倒灌南支对青草沙水源地的影响[J].海洋与湖沼,2001,32(1): 58-66. 顾玉亮,吴守培,乐勤.北支盐水入侵对长江口水源地影响研究[J].人民长江,2003,34(4):1-4. 朱建荣. 海洋数值计算方法和数值模式[M].北京:海洋出版社,2003:72-126. 朱建荣,朱首贤. ECOM模式的改进及在长江河口、杭州湾及邻近海区的应用[J].海洋与湖沼,2003,34(4):364-374. Wu H,Zhu J. Advection scheme with 3rd high-order spatial interpolation at the middle temporal level and its application to saltwater intrusion in the Changjiang Estuary[J]. Ocean Modelling,2010,33(1):33-51. Wu H,Zhu J,Chen B,et al. Quantitative relationship of runoff and tide to saltwater spilling over from the North Branch in the Changjiang Estuary: A numerical study[J]. Estuarine,Coastal and Shelf Science,2006,69(1): 125-132. Chen B,Zhu J,Fu L. Formation mechanism of freshwater zone around the Meimao Sandbank in the Changjiang estuary[J]. Chinese Journal of Oceanology and Limnology,2010,28: 1329-1339. Li L,Zhu J,Wu H,et al. A numerical study on water diversion ratio of the Changjiang (Yangtze) estuary in dry season[J]. Chinese Journal of Oceanology and Limnology,2010,28: 700-712. Wu H,Zhu J,Ho Choi B. Links between saltwater intrusion and subtidal circulation in the Changjiang Estuary: A model-guided study[J]. Continental Shelf Research,2010,30(17): 1891-1905. 海洋图集编委会.渤海黄海东海海洋图集(水文)[M].北京: 海洋出版社,1992: 13-168.
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