闽江竹岐至侯官河段河床演变规律与整治初探

近年来，竹岐至侯官河段冲淤变化快，局部河段流态恶化，时有船舶搁浅，甚至出现翻船事故，航道整治迫在眉睫，本文根据大量实测的水文、泥沙和地形资料，分析该河段近年来的演变规律和影响因素，发现受水电站泄水、采沙和特殊水文年水文动力因素等综合影响，该河段总体演变趋势是冲刷，但浅滩淤积，且整治建筑物对河床冲淤有较大影响，在此基础上，从水流动力基本理论出发，用二维数值模拟方法，进一步研究整治建筑物对流场的影响，揭示了局部河段流态恶化的原因，提出修建N18坝束水归槽，修建S15坝调整局部河段流场改善流态的整治方案，模拟计算表明，这一措施效果良好，研究成果可供工程实践参考。

Study on Regulation Measures and River-Bed Evolution of Zhuqi-Houguan of Minjiang River

Erosion and deposition of river bed in Zhuqi Houguan is fast, local regime of flow worsen in recent year, sometimes a ship gets stranded,even a ship turns over, it is important to regulate waterways. According to a great deal of hydrology dynamic, sediment transport and topography data, the rule of river bed evolution and influence factors are analyzed, a total tendency of river bed evolution is river bed erosion but shoal deposition under the influence of dynamic of hydroelectric power station discharge, sand production and hydrology dynamic in particular water year, and regulation works have influence on erosion and deposition of river bed.On the basis, the influence of regulation work on velocity field is studied by a plane 2 D mathematics model for unsteady flow, reason of bad regime of flow is revealed, building N18 dike to contract river width and building S15 dike to regulate local flow and to improve regime of flow are raised.The calculated results show that the regulation plane is good. The result can be used for reference in engineering practice.