河湖水系连通对城市河道生态修复水动力作用效果——以猎德涌为例
Hydrodynamic Effects of River-Lake System Connectivity on Ecological Restoration of Urban Rivers:A Case Study of Liede River
王少波 1张舒 1熊玉龙 1周新民2
作者信息
- 1. 水利部珠江水利委员会水文局,广东 广州 510611
- 2. 广州市河涌监测中心,广东 广州 510000
- 折叠
摘要
为探讨河湖水系连通对再生水补给型城市河道生态修复水动力作用效果,以猎德涌为例,采用四级架构建立河湖水动力和污染物输移数学模型,分析"水系连通-调蓄-水质"驱动响应规律.研究显示,猎德涌河床平均坡降达到1.95‰,具有典型山溪性河道特征;猎德涌口水闸调度主要影响闸前约1/3长度河道的水深,中、上游河段水深主要受上游补水流量控制;因此,上游补水流量恒定时,水面率和湿周率变化主要集中在下游1/3河段内.水系连通后,人工湖的调蓄能力可维持猎德涌当前补水流量时长约20.1 h,并将污染物滞留于人工湖内约3.2 d,进入猎德涌的污染物经过约10 d后抵达涌口,可有效缓解长虹湖泵站直接补水带来的生态冲击.结果表明,通过水系连通优化再生水补给型城市河道的水动力条件,可显著改善河道水质及水生生物栖息地环境,从而促进生态修复.
Abstract
To investigate the hydrodynamic effects of river-lake system connectivity on the ecological restoration of urban rivers supplemented by reclaimed water,a four-tier framework was employed to establish a mathematical model of river-lake hydrodynamics and pollutant transport by using the Liede River as an example.The study analyzed the driving response patterns of"system connectivity-regulation and storage-water quality."The findings indicate that the average slope of the Liede River bed is 1.95‰,exhibiting typical characteristics of a mountain stream.The operation of the sluice gate at the mouth of the Liede River primarily affects the water depth of approximately one-third of the river upstream of the gate,while the water depth in the middle and upper reaches is mainly controlled by the upstream replenishment flow.Consequently,when the upstream replenishment flow is constant,changes in the water surface rate and wetted perimeter rate are predominantly concentrated in the downstream one-third of the river.After water system connectivity,the regulation and storage capacity of the artificial lake can sustain the current replenishment flow of the Liede River for approximately 20.1 hours and retain pollutants within the artificial lake for about 3.2 days.Pollutants entering the Liede River take around 10 days to reach the river mouth,effectively mitigating the ecological impact of direct water replenishment from the Changhong Lake Pumping Station.The results demonstrate that optimizing the hydrodynamic conditions of urban rivers supplemented by reclaimed water through water system connectivity can significantly enhance river water quality and aquatic habitat environments,thereby promoting ecological restoration.
关键词
城市河道/再生水/水系连通/生态修复/水动力模型/猎德涌Key words
urban river/reclaimed water/water system connectivity/ecological restoration/hydrodynamic model/Liede River引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据