近60年來長江河口河勢變化及其對水動(dòng)力和鹽水入侵的影響Ⅱ.水動(dòng)力
[Abstract]:Based on the coastal and bathymetric data obtained from the charts of the Yangtze River Estuary in the 1950s and 1970s, as well as the measured data of the bathymetric data in 2012, the model grids of different ages are set up in this paper, and the runoff is taken into account. Based on tidal and wind stress, a three-dimensional numerical model of hydrodynamics and salt water intrusion in the Yangtze River estuary is established. The tidal current, single width residual flux, bifurcation water flux and shunt ratio, and the effects of river regime changes on them are simulated and analyzed in different ages. The variation of the maximum tide difference in the three years is mainly in the northern branch region. From 1950s to 1970s, the northern branch tide difference decreased, and the decreasing area concentrated in the middle part of the north branch, and increased in 2012 compared with the north branch difference in the 1970s. In the 1950s, the water flux of the north port was larger than that of the south port, the lower part of the north branch was transported upstream, the upper part was smaller, the south port was larger than the north port in the 1970s, the lower part of the north branch was smaller, and the upper part was downstream, and in 2012, the water flux of the north and south ports was relatively close to that of the north-south port. Beigang slightly larger, the whole north branch water flux upstream. In this paper, the rise, ebb, net water and diversion ratio of spring tide, ebb tide and net water volume in the north-south branch of the north-south port and the north-south branch of the port in the 1950s, 1970s and 2012 are quantitatively given, and the causes of the change in different years are analyzed in combination with the change of river regime.
【作者單位】: 華東師范大學(xué)河口海岸國家重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金項(xiàng)目(41476077) 上海市科委重點(diǎn)項(xiàng)目(14231200402)
【分類號】:TV148
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