刘培,魏乾坤,陈秋伶

• 1:水利部珠江河口治理与保护重点实验室
• 2:水利部珠江水利委员会珠江水利科学研究院

摘要(Abstract)：

【目的】河流水系是城市重要的资源和环境载体，水系连通是保证河流系统健康完整和功能正常发挥的重要条件，而活水调度是提高水体流动性和改善水生态环境的重要手段。水系连通指标是分析和评价连通性的关键，【方法】针对珠江三角洲地区的复杂河网，首次提出将往复流河段和断头涌河段长度占比纳入水系连通评价指标体系，分析研究典型区域水系现存问题，提出水系连通与调度方案，采用数学模型评估方案效果，研究珠江三角洲复杂河网水系连通与活水调度工程问题。【结果】结果显示：现状良安水系水动力条件较差，存在往复流和水体交换周期长等问题，水质污染严重，通过清淤疏浚、水系连通和引水工程调度活水，使往复流变为单向流，将现状15.3 d的河道平均换水周期最小缩短至7.3 d,河道现状流速0.021 m/s最大增加至0.124 m/s,区域的水动力条件和区域水质得到明显改善。【结论】结果表明：珠江三角洲城市化程度较高地区的河涌常存在有复流河段和断头涌河段影响河道的水质，有针对性地提出水系连通评价指标体系，并采取合适的清疏引水工程调度等措施，加强水系内部循环，可以改善水系的水质，提升水系综合治理的效果。研究结果可为珠江三角洲复杂河网区水环境问题改善与解决提供典型案例参考。

关键词(KeyWords)： 珠江三角洲;水系连通;指标体系;水环境;活水;水资源调度

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2021YFC3001000)

作者(Author): 刘培,魏乾坤,陈秋伶

DOI: 10.13928/j.cnki.wrahe.2024.01.010

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