河口三角洲径流和潮汐相互作用模型及应用

发布时间：2018-04-29 14:59

本文选题：潮汐 + 径流　；参考：《热带海洋学报》2017年05期

【摘要】：受径流影响和调制,径优型河口潮汐的非线性作用强,潮汐调和分析和预报误差大。文章在调和分析方法的基础上,结合河口三角洲内径潮相互作用机理,假定河道地形变化微弱,采用实测潮水位和上游径流量,建立径流和潮汐调和分析(river-tidal harmonic analysis,简称RTHA)模型,用于分析和研究珠江三角洲的径流和潮汐的相互作用过程。结果表明,对于珠江河口年尺度的潮水位数据,RTHA模型分析和预报的标准误差0.12~0.17 m,方差贡献(相关指数)为91%~98%,特别是在径流作用强的河口三角洲中上段,RTHA模型结果远高于传统的调和分析和预报结果,可以以较高精度分离径流和潮汐信号。利用该回归模型对珠江径流影响下非线性潮汐的变化进行研究,结果发现,珠江径流量的洪枯季变化引起河口全日分潮、半日分潮、三分之一分潮的振幅洪季小、枯季大,口门段四分之一分潮的振幅洪季大、枯季小;洪季全日分潮、半日分潮传播速度变小(位相增大),分潮振幅沿程衰减幅度显著增大,自枯季的10%~30%迅速增加到洪季的70%~80%。
[Abstract]:Due to the influence and modulation of runoff, the nonlinear effect of diametral estuary is strong, and the error of tidal harmonic analysis and prediction is large. On the basis of harmonic analysis method and combined with the interaction mechanism of inner diameter tide in estuarine delta, assuming that the variation of river channel topography is weak, a model of runoff and tidal harmonic analysis is established by using measured tidal level and upstream runoff. It is used to analyze and study the interaction between runoff and tide in the Pearl River Delta. The results show that For the annual tidal level data of the Pearl River Estuary, the standard error of RTHA model analysis and prediction is 0.12 ~ 0.17 m, and the variance contribution (correlation index) is 91 ~ 98, especially in the upper and middle part of the estuary delta with strong runoff. The result of RTHA model is much higher than that of the traditional RTHA model. Harmonic analysis and prediction results of the Runoff and tidal signals can be separated with high accuracy. The regression model is used to study the variation of nonlinear tide under the influence of Pearl River runoff. The results show that the variation of flood and dry season of Pearl River runoff results in the whole day tide, half day tide, the amplitude of the third minute tide is small, and the dry season is large. The amplitude of a quarter of the tide in Koumen section is large in the flood season and small in the dry season, and in the whole day of the flood season, the propagation velocity of the half-day tide becomes smaller (the phase increases, the attenuation amplitude of the amplitude along the course of the tidal component increases significantly, and the amplitude increases rapidly from 1030% in the dry season to 70% in the flood season.
【作者单位】：中山大学河口海岸研究所河口水利技术国家地方联合工程实验室;
【基金】：国家重点研究发展计划(2016YFC0402600) 国家自然科学基金项目(41106015)~~
【分类号】：P333.1;P731.23

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