Response of tidal asymmetry characteristics to shoreline evolution in Pearl River Estuary
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摘要:
河口地区的潮汐不对称性影响着近岸物质运输和地貌演变。基于Delft 3D FM二维水动力模型，模拟了伶仃洋在1 970 s、2 010 s和2016年治导线岸线条件下的潮汐运动。通过非稳态调和分析和偏度计算方法，量化了该海域潮汐不对称性对于岸线变化的响应，并通过分析不同分潮组合的贡献，探讨潮汐不对称变化的机制。研究结果表明：伶仃洋的大小潮涨落潮的潮高不对称性不同，岸线向海推进会增强潮汐不对称性的涨潮优势。岸线向海推进会增大浅水文分潮的潮汐振幅，减小天文分潮的潮汐振幅，同时加快潮波传播速度。天文分潮组合对潮汐不对称性的贡献向上游逐渐减弱，而浅水分潮组合的贡献则逐渐增强。
Abstract:
Tidal asymmetry exerts an influence on nearshore material transportation and geomorphic evolution.Based on the Delft 3D FM,a two-dimensional hydrodynamic model is employed to establish the tidal movement simulations of Lingding Bay under the conditions of 1 970 s,2 010 s and the 2016 governing guideline shoreline.The response of tidal asymmetry to the seaward advancement of the shoreline in this area is analyzed by combining the reconciliation analysis and the skewness calculation method.Furthermore,the mechanism underlying tidal asymmetry change is examined by analyzing the contribution of different tidal constituent combinations.The research results show that the tidal height asymmetry between spring and neap tides in Lingding Bay varies.The seaward advance of the shoreline strengthens the flood tide dominance in tidal asymmetry.The seaward extension of the shoreline increases the tidal amplitude of the shallow water components while reducing the amplitude of the astronomical components,concurrently accelerating the tidal wave propagation speed.The contribution of the astronomical tidal components to tidal asymmetry gradually decreases upstream,whereas the contribution of the shallow water tidal components gradually increases.
