新水沙环境下青草沙水库外侧滩地形态调整特征及保护措施  

Morphological adjustment characteristics and protection measures of outer beaches around Qingcaosha Reservoir under new flow and sediment conditions

作　　者：李溢汶 杜锐 吴彩娥 LI Yiwen;DU Rui;WU Caie(Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]上海勘测设计研究院有限公司,上海200434

出　　处：《水利水电科技进展》2023年第4期73-78,共6页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划政府间国际科技创新合作项目(2022YFE0117500);上海市科学技术委员会科技创新行动计划项目(21DZ1201700)。

摘　　要：采用青草沙水库周边2014-2019年实测水下地形数据,定量分析了各堤段滩地形态调整特征,基于MIKE21数值模型对护滩措施的效果进行了模拟。结果表明:2014年后青草沙水库外侧滩地基本未出现明显的淤积外延发展,且局部沙体逐渐萎缩,其中北堤中段外侧滩地头部大幅度冲退,最大距离近900 m(-5 m及-10 m等深线),沙体形态呈扁平化调整,须适时进行保护;新桥通道进、出口落潮主流略有偏转,向水库大堤侧靠近,影响滩地的冲淤过程;在青草沙外侧滩地头部沙体实施潜堤护滩措施后,北堤中段外沙体滩面流速整体明显减小,且对周边区域的水动力过程影响较小。The measured topographic data from 2014 to 2019 were used to quantitatively analyze the morphological adjustment of the shoals around the Qingcaosha Reservoir.The effects of corresponding protection measures for the shoals were explored based on the numerical model MIKE21.The results show that the outer beaches around the Qingcaosha Reservoir stopped sedimentation,and some parts of the beaches shrank after 2014.The head of shoals had been significantly scoured in the middle part of the north dikes,and the maximum scouring distance was nearly 900 m(-5 m and-10 m depth contours).The shoals’shape was flattened,which must be protected in time.The ebb tide mainstream at the inlet and outlet of the Xinqiao channel deflected to the reservoir dikes,which affected the scouring evolution process of the shoals.After the implementation of submerged bank protection at the head of the Qingcaosha Reservoir,the velocity decreased significantly in shoal area outside the middle part of the north dikes,and the protection measures had little impact on the surrounding hydrodynamic processes.

关 键 词：滩地冲淤 护滩措施 长江口 南北港分汊口 青草沙水库 

分 类 号：TV147[水利工程—水力学及河流动力学]