| 摘要: |
| 针对杭州湾滩涂区域的促淤和回淤问题，构建宁波湾南岸区域的水动力及冲淤数值计算模型，结合现场实测冲淤数据验证短期冲淤数值计算模型可靠性，得到该区域未来较长时间尺度下的自然回淤状况，同时对比人工筑堤择优选取促淤方案。研究结果表明，开挖导流作用下的自然淤积滩涂恢复效果显著，而隔堤的修建对于沟槽的泥沙滞留淤积作用显著，修筑-2.22 m高程隔堤后原本低洼的区域平均促淤厚度达0.22 m，低洼区域内部海床高程可以达到2.5 m左右，因而采取以导流自然淤积为主辅以隔堤的滩涂促淤恢复手段，对于高含沙量海域低洼区域的泥沙淤积效果尤为显著。 |
| 关键词: 杭州湾 人工促淤 冲淤计算 数值模拟 |
| DOI：10.20016/j.cnki.hykfygl.2024.06.014 |
| 投稿时间：2023-09-05修订日期：2024-06-17 |
| 基金项目:国家重点研发专项（2018YFB1501901）;浙江省自然科学基金项目（LO20D060003）. |
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| Study on Numerical Simulation and Prediction of Silt Return in Hangzhou Bay Beach |
| LI Ran,GONG Ming,XU Xuefeng,SONG Zekun,YANG Wankang,KAI Liqiong |
| Ocean Engineering Survey and Design Research Institute, Second Institute of Oceanography of MNR,;Ocean Engineering Survey and Design Research Institute, Second Institute of Oceanography of MNR,; Key Laboratory of Marine Space Resources Management, Ministry of Natural Resources |
| Abstract: |
| Aiming at the problems of siltation promotion and siltation return in the beach area of Hangzhou Bay, a numerical calculation model of hydrodynamic and scour and siltation in the south bank of Ningbo Bay was constructed, and the reliability of the short-term scour and siltation numerical calculation model was verified by combining with the field measured scour and siltation data, so as to obtain the natural siltation situation in this area under a longer time scale in the future. Meanwhile, the siltation promotion scheme was selected by comparing with artificial embankment construction. The research results show that the restoration effect of natural silt beach under the action of excavation diversion is remarkable, and the construction of barrier has a significant effect on the retention and sedimentation of sediment in the trench. After the construction of the barrier with a height of -2.22m, the average thickness of sediment promotion in the low-lying area reaches 0.22m, and the elevation of seabed in the low-lying area can reach about 2.5m. Therefore, it is particularly effective for the sediment deposition in low-lying areas in the high sediment content sea area to adopt the method of natural diversion and separation embankment. |
| Key words: Hangzhou Bay, Artificial silting promotion, Scouring and silting calculation, Numerical simulation |
