长江口深水航道水流特征沿程分布准调和分析

发布时间：2018-05-27 04:08

本文选题：长江口 + 深水航道　；参考：《科学技术与工程》2016年07期

【摘要】：根据长江口深水航道治理工程二期2005年8月大潮期间的水文测验资料,选取NG0、NG3、CB1、CS0、CS1、CB2、CS2、CS6、CSW、CS3、CS7、CS4、CS5共13个站位测点的二个潮周期的六层流速测量资料,对这些测点数据进行准潮流调和分析,得出P_1,K_1,M_2,M_3,M_4,2MK_5,M_6,3MK_7,M_8,M_(10)共10个分潮的潮流调和常数及余流结果,并计算给出了相应椭圆要素。研究分析发现,潮流特征系数值均不超过0.25,沿程各测点区域潮流类型以半日潮为主。对太阴半日分潮M_2的椭圆长半轴、椭圆短半轴、椭率以及格林威治迟角等椭圆要素空间分布特征进行分析比较。总结潮流椭圆要素、潮流特征、浅水影响分子、余流以及最大可能潮流流速的沿程空间变化规律以及动力影响分析。M_2分潮的椭圆要素有较强的规律性,浅水影响因子随水深变小而增大,在总体上都有沿程减小的趋势。最大可能潮流流速在垂向从表层到近底层逐渐减小,符合水流流速沿水深的分布。研究结果对理解深水航道动力状况、淤积机制和指导航道工程整治具有一定价值。
[Abstract]:Based on the hydrological data during the spring tide in August 2005 in the second phase of the Yangtze Estuary Deepwater Channel Regulation Project, the six-layer velocity data of two tidal periods of 13 stations at 13 stations were selected and the data were analyzed by using quasi-tidal current harmonic analysis of the data of NG0 / NG3C / C / C / C _ 0 / C _ (2) / C _ (2) / C _ (2) / C _ (2) / C _ (6) / CS _ (6) / C _ (7) C _ (7) C _ (4) C _ (4) C _ 5. The results of the current harmonic constant and the residual current of the total of 10 components of the current have been obtained, and the corresponding elliptical elements have been calculated. It is found that the characteristic coefficient of tidal current is not more than 0.25, and the regional tidal current type is mainly semi-diurnal tide. The spatial distribution characteristics of elliptical elements such as elliptical long half axis, elliptical short half axis, ellipticity and Greenwich's late angle of Taiyin semidiurnal tide M _ 2 are analyzed and compared. The elliptical elements of tidal current, the characteristics of tidal current, the influence molecules of shallow water, the law of spatial variation of residual current and the maximum possible tidal current velocity along the course, and the elliptical elements of dynamic influence analysis. The influence factors of shallow water increase with the decrease of water depth and decrease along the whole. The maximum possible tidal current velocity decreases gradually from the surface to the near bottom layer in the vertical direction, which accords with the distribution of the flow velocity along the depth of the water. The results are valuable for understanding the dynamic state of deepwater channel, silting mechanism and guiding regulation of waterway engineering.
【作者单位】：河海大学海岸灾害与防护教育部重点实验室;河海大学港口海岸与近海工程学院;
【基金】：国家自然科学基金面上项目(51279055)资助
【分类号】：U612.23

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