| 摘要: |
| 本文针对长江口深水航道南坝田挡沙堤加高工程前后浮泥特征，通过对工程前后浮泥多维度特征深入剖析，得到了工程后深水航道浮泥量减小的结果，从浮泥的角度验证了北槽南坝田挡沙堤加高工程的减淤效果，为长江口深水航道的长期稳定维护提供了关键依据，助力合理规划后续河口治理工程，优化工程设计，降低维护成本，进一步保障区域水运安全与经济发展。得出的结论如下：（1）常态天气小潮汛期间，工程后浮泥厚度、方量、分布显著减小，其中浮泥方量平均减少55万方，浮泥厚度平均减小0.21m，浮泥分布（0.5m以上厚度）里程减小5.30km。（2）非常态天气过程中，在相同累积波能条件下，风后的浮泥体积及方量，南坝田挡沙堤加高工程后的明显小于工程前。（3）工程后浮泥厚度峰值减小了0.50m，就0.5m以上厚度浮泥而言，工程后浮泥厚度减小了0.21m，浮泥分布里程缩减了5.46km，浮泥发生次数减少了29%。另外，大厚度浮泥厚度、分布里程、发生频率减小更为显著。 |
| 关键词: 浮泥 常态天气 非常态天气 最大厚度 平均厚度 分布范围 发生频率 |
| DOI： |
| 分类号:TV148 |
| 基金项目: |
|
| Analysis of the Characteristics of the Fluid Mud in the Deepwater Channel of the North Passage of the Yangtze Estuary before and after the Heightening Project of the South Dam Field Sand-Blocking Dike |
|
CAO Jie, CHENG Chen, WANG Zhong Yin, WANG Yuan Ye
|
|
Key Laboratory of Estuarine Coastal Engineering,Ministry of Transport,Shanghai Estuarine and Coastal Science Research Center
|
| Abstract: |
| This paper focuses on the characteristics of fluid mud before and after the heightening project of the sand - blocking dike in the South Dam Field of the Yangtze River Estuary Deepwater Channel. Through an in - depth analysis of the multi - dimensional characteristics of fluid mud before and after the project, it is concluded that the amount of fluid mud in the deepwater channel has decreased after the project. From the perspective of fluid mud, the sediment - reduction effect of the heightening project of the sand - blocking dike in the South Dam Field of the North Passage is verified, which provides a key basis for the long - term stable maintenance of the Yangtze River Estuary Deepwater Channel, helps to rationally plan subsequent estuary regulation projects, optimize project design, reduce maintenance costs, and further ensure regional waterway transportation safety and economic development. The conclusions are as follows:(1) During normal - weather neap tides, the thickness, volume and distribution of fluid mud have significantly decreased after the project. Specifically, the average volume of fluid mud has decreased by 550,000 cubic meters, the average thickness of fluid mud has decreased by 0.21m, and the mileage of fluid mud distribution (with a thickness of more than 0.5m) has decreased by 5.30km.(2) During abnormal - weather processes, under the same cumulative wave energy conditions, the volume and quantity of fluid mud after the wind are significantly smaller after the heightening project of the sand - blocking dike in the South Dam Field than before the project.(3) After the project, the peak value of fluid mud thickness has decreased by 0.50m. For fluid mud with a thickness of more than 0.5m, the thickness of fluid mud has decreased by 0.21m, the distribution mileage has decreased by 5.46km, and the occurrence frequency has decreased by 29%. In addition, the thickness, distribution mileage and occurrence frequency of thick fluid mud have decreased more significantly. |
| Key words: fluid mud, normal weather, abnormal weather, maximum thickness,average thickness,distribution range,occurrence frequency |
