| 摘要: |
| 研究河口口门形态与泥沙输移特征之间的关系对河口管理具有重要意义。以磨刀门河口区域作为主要研究区域，构建二维潮流波浪泥沙模型分析典型洪潮组合下的河口泥沙输移及岸滩演变趋势。结果表明：在设计磨刀门口门形态中，喇叭口设计方案输沙能力最大，典型设计洪水过程中，较现状工况输沙量可提升3.06%，可增加口门陆域开发面积24.37km2，其余方案较现状工况输沙能力均减小；中长期冲淤演变过程中，在上游输沙与波浪掀沙作用下，喇叭口方案会形成尖瘦型拦门沙，单汊方案会形成所有方案中最大体积的拦门沙，其余分汊方案拦门沙会逐渐发育至西汊。本研究泥沙输移特征对口门形态的响应数值模拟分析可以为河口综合治理、防洪减灾、生态保护、同类型河口的水沙地貌演变提供科学依据。 |
| 关键词: 河口口门形态、泥沙输移、磨刀门、潮流泥沙模型 |
| DOI： |
| 分类号: |
| 基金项目:国家重点研发计划项目(2021YFC3001000) |
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| Numerical Simulation Analysis of the Response of Sediment Transport to Estuary Morphology in Modaomen |
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Qiu Wenqing1, Zhang Wenqing2, Wang Hangang2, Wang Yu2, Shen Cancheng2
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1.Guangzhou Port Co,Ltd,Guangzhou;2.Pearl River Water Conservancy Committee Pearl River Water Resources Science Research Institute,Guangzhou
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| Abstract: |
| Studying the relationship between estuarine mouth morphology and sediment transport characteristics is of great significance for estuary management. Taking the Modaomen Estuary as the main research area, a two-dimensional tidal current, wave and sediment model was established to analyze the estuarine sediment transport and shoreline evolution trends under typical flood-tide combinations. The results show that among the designed Modaomen Estuary mouth morphologies, the trumpet-shaped scheme has the strongest sediment transport capacity. During a typical designed flood process, its sediment transport volume can be increased by 3.06% compared with the current situation, and the land development area at the estuary mouth can be expanded by 24.37 km2. The sediment transport capacities of other schemes are all lower than that of the current situation. In the medium and long-term scouring and silting evolution process, under the combined action of upstream sediment transport and wave-induced sediment resuspension, the trumpet-shaped scheme will form a sharp and thin tidal delta. The single-channel scheme will form the tidal delta with the largest volume among all schemes. For the other multi-channel schemes, the tidal delta will gradually develop in the channel with the smaller flow rate. The numerical simulation analysis of the response of sediment transport characteristics to estuary mouth morphology in this study can provide a scientific basis for the comprehensive management of estuaries, flood control and disaster reduction, ecological protection, and the hydro-sediment-geomorphology evolution of similar estuaries. |
| Key words: Estuary Morphology Sediment Transport Modaomen Tidal Current-Sediment Model |
