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闽江感潮河段潮汐-洪水相互作用数值模拟

Keywords: 闽江感潮河段 ADCIRC二维模型 高分辨率 洪-潮相互作用

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Abstract:

本文分析了闽江感潮河段洪水、潮汐特征,利用高精度GIS数据建立了基于非结构三角网的高分辨率洪-潮耦合模型,在闽江口重点区域的网格分辨率达到50~100 m.选取竹岐断面作为径流边界并基于"2006.6.6"洪水过程设计了3组数值实验,模拟结果表明:相比于只考虑洪水或者潮汐,在耦合洪水和潮汐后,各代表站的模拟值与实测值更为吻合;在30年一遇洪水的作用下,闽江感潮河段各断面的原有潮汐特征都不同程度地被洪水信号所影响,其中,文山里和解放大桥站表现出明显的洪水特征,而峡南、白岩潭和琯头站则表现出洪、潮混合特征;从峡南到琯头对应河段在高潮时段流速减小而低潮时段则流速增大,说明该河段存在很明显的洪-潮相互作用

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