# 长江口盐水入侵研究（罗小峰）

【作者】罗小峰 【导师】陈志昌
【作者基本信息】南京水利科学研究院，海岸工程，2000年，硕士

【中文摘要】 长江口地区由于径流和潮流的相互消长，盐水入侵极其复杂。本文在前人对长江口地区盐水入侵研究的基础上，根据现场实测资料分析研究了长江口地区动力特性及其对盐水入侵的影响，并进一步分析了长江口地区盐水入侵时空变化规律。 建立了平面二维水流盐度数学模型。通过水流计算，对长江口的流场有大致了解，并在此基础上进行盐度计算。在资料分析中，发现盐度纵向扩散梯度从外海向上游是递减的，本文在盐度验证计算时相应的采取了变紊动扩散系数，验证结果取得了较满意的结果。 将模型应用于长江口，计算区域包括北支在内，对天然情况下（不结合任何工程）洪枯季和大小潮四种水文组合进行了计算。通过计算结果，分析了各水道在不同组次下的盐水入侵情况，进一步得出盐水入侵与径流和潮流的关系。重点对拦门沙水域滩槽盐水入侵进行分析，研究盐水入侵的流体力学机理和盐度扩散输移规律。 模型计算结果再现了长江口地区水流和盐度的基本规律。

【英文摘要】 Saltwater intrusion regular and influence factor in Changjiang estuary are analyzed by field data, based on the previous study.A 2-D depth-integrated numerical model is developed to compute saltwater intrusion. By the field data process, the longitudinal salinity gradient is reduced from down to up, varied horizon salinity diffusion coefficient is adopted accordingly. The result of salinity verification is fitted with the observed data.Neap tide and spring tide in flood season and dry season are respectively computed in Changjiang estuary by the model. Saltwater intrusion in each passage is analyzed, the effect of discharge and tide can be gained. At mouth bar of estuary, saltwater intrusion in channel and bar is also analyzed.The computation results are able to reproduce essential features of tidal current and water intrusion in Changjiang estuary.

【中文关键词】 长江口; 盐水入侵; 数值计算; 盐度紊动扩散系数
【英文关键词】 Changjiang estuary; saltwater intrusion; numerical computation; salinity diffusion coefficient

TAG: 研究 盐水 长江口
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