| 李溢汶,吴巍巍,代 斌.低含沙条件下长江口丁坝群冲淤及水动力变化特点*[J].水运工程,2025,(1):85-92 |
| 低含沙条件下长江口丁坝群冲淤及水动力变化特点* |
| Alluvial and hydrodynamic characteristics of spur-dikes under low sediment concentration condition in the Yangtze River Estuary |
| |
| DOI： |
| 中文关键词: 低含沙条件 丁坝群 滩槽冲淤 水动力 长江口 青草沙水库 |
| 英文关键词:low sediment concentration spur-dikes riverbed evolution hydrodynamic the Yangtze River Estuary Qingcaosha Reservoir |
| 基金项目:国家重点研发计划政府间国际科技创新合作项目（2022YFE0117500） |
|
| 摘要点击次数: 39 |
| 全文下载次数: 0 |
| 中文摘要: |
| 为研究丁坝群工程在低含沙条件下的保滩效果及其与水动力的响应关系，采用青草沙水库北堤外侧2014—2021年实测水下地形数据，定量分析丁坝群工程实施后区域的滩槽冲淤演变特点，基于MIKE21数值模型模拟丁坝群工程在2014与2021年地形条件下的水动力与正向风浪特点。结果表明：青草沙水库北堤丁坝群工程实施后，坝田滩地在2014—2021年间出现了最大厚度近10 m的淤积，滩地高程淤积至0 m附近后保持稳定、冲淤速度变缓，形成的岸坡比降在1:3~1:5；丁坝群头部无冲刷坑形成，与外侧新桥通道底高程在丁坝群实施前已达到-15 m有关；随着坝田滩地的整体淤高，近主槽侧滩面涨落潮流速均呈增大趋势，模拟条件下的高低潮位、有效波高变幅小于0.03 m，基本未受到坝田淤高的影响。丁坝群工程在低含沙条件下仍具有固沙保滩效果，可为长江口水流冲蚀堤岸的护滩带建设提供基础。 |
| 英文摘要: |
| In order to study the shoal protection effect and hydrodynamic characteristics of spur-dikes under the condition of low sediment concentration,the measured topographic data of 2014 to 2021 are used to quantitative analysis the evolution characteristics around the north dikes of Qingcaosha Reservoir after the implementation of spur-dikes.The hydrodynamic and frontal incident waves' characteristics of spur-dikes are simulated under the terrain in 2014 and 2021 on the basis of the numerical model MIKE21.The results show that siltation appears in dam field shoals between 2014 and 2021,with a maximum siltation thickness of nearly 10 meters after the implementation of spur-dikes in north dikes of Qingcaosha Reservoir.The rates of erosion and siltation in shoals slow down,after the elevation of shoals reaches 0 m,they remain stable with a slope between 1:3 and 1:5.There is no scouring pits formed at the head of spur-dikes,which may be related to the fact that the elevation of the Xinqiao Channel has reached -15 m before the implementation of spur-dikes.With the sedimentation of shoals in the dam field,the tidal current velocity of the beach near the main channel is increasing.The amplitudes of tide levels and significant wave height under simulated conditions are less than 0.03 m,which is basically not affected by the siltation of the dam field.The spur-dikes has protection effects under low sediment concentration,which can be used to build the foundation of beach protection projects for the Yangtze River Estuary's water flow erosion embankments. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
