基于非结构网格的长江口横沙东滩新陆域数值模拟

发布时间：2018-04-21 16:59

本文选题：长江口 + 横沙东滩　；参考：《水利水电技术》2017年09期

【摘要】：为探讨长江口横沙东滩新陆域不同成陆方案对长江口北槽水动力条件的影响,基于CJK3DWEM模型,建立了新陆域数学模型,划分计算水域三角形单元138 281个,网格边长平均约150.0 m。计算结果表明:横沙东滩新陆域形成后,北港上断面、南槽下断面落潮分流比略有减小,分流比变化均在1.00%以内;南港河段、北槽中上段涨落急流速不同程度增加,增加幅度为5~15 cm/s;北槽下段涨落急流速略有减小,减小幅度为5~10 cm/s;北港沿程落急流速有不同程度减小,减小幅度为5 cm/s左右;工程区北侧和南侧高潮位降低,低潮位变化相对较小,原因在于圈围工程主要布置在横沙东滩高程-5.0 m以上浅滩区域,圈围后明显阻隔了涨潮漫滩流。
[Abstract]:In order to investigate the influence of different land forming schemes on hydrodynamic conditions of the northern trough of the Yangtze Estuary, a mathematical model of the new land area was established based on the CJK3DWEM model. The triangular elements were divided into 138,281 units and the average length of the grid side was about 150.0 m. The calculation results show that after the formation of the new continental area in Hengsha Dongtan, the downtrend distribution ratio of the upper section of the North Port and the South trough section decreases slightly, and the variation of the distribution ratio is less than 1.00%, and the fluctuation velocity of the upper and middle reaches of the northern channel increases in varying degrees. The amplitude of increase is 5 ~ 15 cm / s; the sharp velocity of fluctuation in the lower part of the north trough decreases slightly to 510 cm / s; the velocity of rapid flow along the course of Beigang decreases to about 5 cm/s; the high tide level in the north and south side of the project area decreases. The change of low tide level is relatively small, because the ring closure works are mainly arranged in the area above -5.0 m in the elevation of the east beach of Hengsha, and the flood beach flow is obviously blocked after the circle encirclement.
【作者单位】：南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：国家重点研发计划“变化环境下河口海岸水安全保障关键技术研究与应用”(2016YFC0401505) 国家自然科学基金青年基金“潮汐河口淹没丁坝群坝田水沙运动及淤积机理研究”(51509161) 上海市科学技术委员会科研计划项目“新横沙成陆开发和深水新港建设可行性关键技术研究”(15DZ1202400)
【分类号】：TV148.1

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