建闸河口整治工程与河床演变特征

发布时间：2018-07-01 12:14

本文选题：双龙河口 + 挡潮闸　；参考：《同济大学学报(自然科学版)》2017年05期

【摘要】：建闸河口整治工程引起的河床演变调整十分复杂.基于验证好的潮流、泥沙输运及河床演变模型分析了双龙河口整治一期工程和二期工程后水动力和河床演变的响应特征.结果表明,闸下河道水动力变化和河道冲淤分布与局部浚深拓宽及纳潮量增加有密切联系.若仅对河道上段局部河道进行整治,浚深拓宽段的涨落潮不对称现象加剧,局部产生回流区.若以固定坡降对整条河道进行整治,则涨落潮流速显著增加且不对称性减小.纳潮量增加在工程初期会引起口门段冲刷,而局部拓宽段会因流速相对减小而产生淤积,特别是在回流区淤积严重.因此为延长工程寿命,尚需辅以定期开闸放水和局部清淤等措施.
[Abstract]:The river bed evolution and adjustment caused by the construction gate estuary regulation project is very complex. Based on the verified tidal current, sediment transport and riverbed evolution model are used to analyze the response characteristics of hydrodynamics and riverbed evolution after the first and second stage of Shuangyong Estuary Regulation Project. The results show that the hydrodynamic changes and the distribution of scour and silt are closely related to the widening of local dredging and the increase of tidal absorption. If only the upper part of the river is renovated, the asymmetry of the ebb and drop tide in the dredged widening section will be aggravated, and the local backflow area will be produced. If a fixed slope is used to regulate the whole river channel, the fluctuation tidal current velocity increases significantly and the asymmetry decreases. At the beginning of the project, the increase of tidal absorption will cause erosion of the entrance section, while the local widening section will be silted due to the relative decrease of the velocity of flow, especially in the backflow area. Therefore, in order to prolong the life of the project, some measures such as regular opening of water and local desilting are needed.
【作者单位】：同济大学土木工程学院;国家海洋局秦皇岛海洋环境监测中心站;河北省地矿局水文工程地质勘查院;
【基金】：中央分成海域使用金项目(THY-2011)
【分类号】：TV147;TV66

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