發(fā)布時(shí)間：2018-04-21 16:59

  本文選題：長(zhǎng)江口 + 橫沙東灘��； 參考：《水利水電技術(shù)》2017年09期

【摘要】：為探討長(zhǎng)江口橫沙東灘新陸域不同成陸方案對(duì)長(zhǎng)江口北槽水動(dòng)力條件的影響,基于CJK3DWEM模型,建立了新陸域數(shù)學(xué)模型,劃分計(jì)算水域三角形單元138 281個(gè),網(wǎng)格邊長(zhǎng)平均約150.0 m。計(jì)算結(jié)果表明:橫沙東灘新陸域形成后,北港上斷面、南槽下斷面落潮分流比略有減小,分流比變化均在1.00%以內(nèi);南港河段、北槽中上段漲落急流速不同程度增加,增加幅度為5~15 cm/s;北槽下段漲落急流速略有減小,減小幅度為5~10 cm/s;北港沿程落急流速有不同程度減小,減小幅度為5 cm/s左右;工程區(qū)北側(cè)和南側(cè)高潮位降低,低潮位變化相對(duì)較小,原因在于圈圍工程主要布置在橫沙東灘高程-5.0 m以上淺灘區(qū)域,圈圍后明顯阻隔了漲潮漫灘流。
[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.
【作者單位】： 南京水利科學(xué)研究院水文水資源與水利工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃“變化環(huán)境下河口海岸水安全保障關(guān)鍵技術(shù)研究與應(yīng)用”(2016YFC0401505) 國(guó)家自然科學(xué)基金青年基金“潮汐河口淹沒(méi)丁壩群壩田水沙運(yùn)動(dòng)及淤積機(jī)理研究”(51509161) 上海市科學(xué)技術(shù)委員會(huì)科研計(jì)劃項(xiàng)目“新橫沙成陸開(kāi)發(fā)和深水新港建設(shè)可行性關(guān)鍵技術(shù)研究”(15DZ1202400)
【分類號(hào)】：TV148.1

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