长江河口控制站泥沙絮凝特性研究

发布时间：2018-03-20 05:13

本文选题：长江河口　切入点：泥沙　出处：《泥沙研究》2016年05期 　论文类型：期刊论文

【摘要】：基于2008-2014年逐月现场激光粒度仪(LISST)在长江口徐六泾的定点观测数据,分析了河口控制站徐六泾的悬沙絮凝特性,研究给出絮团粒径与有效密度及沉速的关系。统计表明絮团平均粒径变化范围20~120μm,比分散颗粒中值粒径(平均5.3μm)大一到两个数量级。絮团的分形维数主要在1.8~2.4,有效密度变化范围70~600kg/m~3,其随絮团增大呈减小趋势。洪枯季对比表明,洪季絮团沉降速度比枯季大18%,平均沉速分别为0.26mm/s和0.22mm/s,比以往估算得到的长江口浑浊带絮团沉速小。由此说明为更好认识流域到河口的泥沙输运过程,有必要针对长江河口不同区域进行分段的研究。
[Abstract]:Based on the fixed point observation data of laser particle size analyzer LISST from 2008 to 2014 in Xuliujing, an estuary control station, the flocculation characteristics of suspended sediment in Xuliujing, a estuary control station, are analyzed. The relationship between the particle size of flocs and the effective density and settling velocity is given. Statistics show that the average particle size of flocs varies from 20 渭 m to 120 渭 m, which is one to two orders of magnitude larger than that of the median particle size of dispersed particles (5.3 渭 m). The fractal dimension of flocs is mainly 1.8U / 2.4, which is effective. The variation range of density is 70 ~ 600kg / m ~ (-3), and the density decreases with the increase of flocs. The comparison of flood and dry season shows that, The settling velocity of flocs in flood season is 18% higher than that in dry season, and the average settling velocity is 0.26 mm / s and 0.22 mm / s, respectively, which is smaller than that in the muddy zone of the Changjiang Estuary, which shows that the sediment transport process from river basin to estuary can be better recognized. It is necessary to study the different regions of the Yangtze River estuary.
【作者单位】：华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金项目(51320105005;41276080;41406094;41506105) 华东师范大学河口海岸学国家重点实验室自主课题(2015RCDW02)
【分类号】：TV148.1

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