长江口北槽中段枯季输盐输沙特征研究

发布时间：2018-06-02 00:32

本文选题：含沙量 + 盐度　；参考：《泥沙研究》2016年03期

【摘要】：基于2012年4月15日至23日在长江口北槽中段获得的枯季水文泥沙定点观测资料,运用通量机制分解法探讨了测点处从小潮到大潮连续16个潮周期的输盐输沙特征。结果表明,从小潮到大潮,测点处向海输盐中,欧拉余流输移项贡献最大;向陆输盐中,小潮时以"潮泵效应"输移项为主,中潮和大潮以斯托克斯漂移输移项为主,垂向净环流输移项次之。在向海输沙中,欧拉余流输移项贡献最大;在向陆输沙中,以斯托克斯漂移输移项为主,垂向净环流输移项次之。由于盐水楔的出现,北槽存在重力环流,这对北槽泥沙输运过程具有重要影响。小潮时水体垂向混合弱于大潮,盐水楔主要出现在近底部水层,这是导致垂向净环流输沙项对向陆输沙的贡献率从小潮向大潮不断减小的一个重要原因。
[Abstract]:Based on the hydrological and sediment observation data obtained from the middle section of the northern channel of the Yangtze River Estuary from 15 to 23 April 2012, the characteristics of salt and sediment transport in 16 successive tidal periods from the small tide to the spring tide at the measured points were studied by using the flux mechanism decomposition method. The results show that the Eulerian residual current transport contributes most to the sea transport from the small tide to the spring tide, the "tidal pump effect" is the main transport term in the low tide, and the Stokes drift transport is the main transport term in the middle tide and the spring tide. The vertical net circulation transport term is the second. The Euler residual current transport is the most important in the marine sediment transport, while the Stokes drift transport is the main one, and the vertical net circulation transport is the second. Due to the presence of brine wedge, gravity circulation exists in the north channel, which has an important effect on the sediment transport process in the north channel. The vertical mixing of water during low tide is weaker than that of spring tide, and the brine wedge mainly appears in the water layer near the bottom, which is an important reason that the contribution rate of vertical net circulation sediment transport to the trending land sediment transport is decreasing continuously from the small tide to the spring tide.
【作者单位】：华东师范大学河口海岸学国家重点实验室;安徽省灵璧中学;
【基金】：国家自然科学基金项目(41176069)
【分类号】：TV148.4

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