本文選題：水動力結(jié)構(gòu) + 懸沙分布特征　； 參考：《人民長江》2017年03期

【摘要】：通過2011年8月中旬一個(gè)大潮期間長江口南港某橫斷面上的5個(gè)定點(diǎn)水沙觀測資料,分析了南港水動力及懸沙在潮周期及橫斷面上的分布特征。結(jié)果表明:在時(shí)間尺度上,南港潮位波動以半日分潮為主,日分潮較小;受徑流及Stokes漂流的影響,漲潮流流速明顯小于落潮流流速;含沙量隨潮波動現(xiàn)象明顯,波動頻率是潮流的2倍;在空間尺度上,南港縱向流速最大值分布在南側(cè)主槽,轉(zhuǎn)流從北側(cè)副槽率先開始;側(cè)向流主要是由科氏力對縱向流的偏轉(zhuǎn)作用形成;北側(cè)副槽平均含沙量大于南側(cè)主槽;半日潮流驅(qū)動下,平均含沙量在急流和憩流時(shí)刻將分別增大和降低;半日潮流和余流共同驅(qū)動下,在落急時(shí)刻和漲急時(shí)刻分別會增大和降低平均含沙量。
[Abstract]:Based on the observation data of water and sediment at five fixed points on a cross section of the South Port of the Changjiang Estuary during a spring tide in the middle of August 2011, the characteristics of hydrodynamic force and suspended sediment distribution on the tidal cycle and cross section of the South Port are analyzed. The results show that, on the time scale, the tidal level fluctuation in the south port is mainly semi-diurnal, and the diurnal tidal component is small, and the tidal current velocity is obviously lower than that of the falling tidal current under the influence of runoff and Stokes drift, and the sediment content fluctuates with the tide obviously. The frequency of fluctuation is 2 times that of tidal current, on spatial scale, the maximum longitudinal velocity of Nangang is distributed in the main channel of the south side, and the diversion begins from the secondary trough on the north side, and the lateral flow is mainly formed by the deflection of Coriolis force to the longitudinal flow. The average sediment content of the north side secondary trough is larger than that of the southern main channel; the mean sediment concentration will increase and decrease at the time of the jet current and the open flow under the driving force of the half day tidal current, and the half day tidal current and the residual current together drive, The average sediment content will increase and decrease respectively at the time of falling and rising.
【作者單位】： 三峽大學(xué)水利與環(huán)境學(xué)院;上海地質(zhì)調(diào)查研究院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41506103) 三峽大學(xué)博士人才啟動基金項(xiàng)目(KJ2014B032)
【分類號】：TV148

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本文編號：1825631