异龙湖水质时空演变特征及其驱动力分析
Analysis on spatial-temporal variation characteristics and driving forces of water quality in Yilong Lake
投稿时间:2024-01-24  修订日期:2024-04-15
DOI:
中文关键词:  水动力特性  时空演变特征  污染物来源解析  驱动力因素  内源释放  异龙湖
英文关键词:Hydrodynamic characteristics  Characteristics of spatiotemporal evolution  Analysis of pollutant sources  Driving factors  Endogenous release  Yilong Lake
基金项目:国家自然科学基金:NSFC-云南联合基金(U2202207)
作者单位邮编
马巍* 中国水利水电科学研究院 水生态环境研究所 100038
王军亮 中国水利水电科学研究院 水生态环境研究所 
王云飞 中国南水北调集团中线有限公司河北分公司 
毛宗波 云南省水利水电勘测设计研究院 
金超 中国水利水电科学研究院 水生态环境研究所 
秦银徽 云南省水利水电勘测设计研究院 
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中文摘要:
      异龙湖是云南九大高原湖泊中流域面积最小、湖泊水量最少、水质污染程度相对最重、最易受人类活动干扰和近年来唯一干涸过的高原浅水型湖泊,受自然环境条件和人类活动双重驱动影响,近年来异龙湖水质演变过程十分复杂、水质污染问题日益突出。本文以构建的湖泊水动力与水质模型为主要技术手段,并结合湖流原位观测,深入研究了异龙湖的水动力特性及入湖污染物的迁移扩散规律,初步揭示了异龙湖水质的时空演变特征及其成因。其中,水资源总量不足和不恰当的调度运行管理是影响异龙湖水质年际波动变化并逐步向封闭性湖泊转变的最主要因子,不利的湖流形态与不同特征污染物的来源组成是驱动异龙湖水质时空分布差异性的关键因素,随降雨径流输入的外源、湖区浮游植物异常增殖合成的大量有机物和湖泊底泥释放的大量内源负荷是异龙湖2021年水质变差与快速返劣的重要驱动因素,因此,增加流域内清洁水资源量和入出湖水量、加快湖泊内源与陆域污染物输入治理、强化对雨季主要入湖河流水质浓度的管控,是实现近期湖区水质快速脱劣并持续性改善的关键。
英文摘要:
      Yilong Lake is the smallest plateau shallow water lake among the nine major plateau lakes in Yunnan, with the smallest watershed area, the least water volume, the relatively heaviest water pollution level, the most susceptible to human activities, and the only one that has dried up in recent years. Driven by both natural environmental conditions and human activities, the water quality evolution process of Yilong Lake has been very complex in recent years, and the problem of water pollution has become increasingly prominent. This article uses the constructed lake hydrodynamic and water quality model as the main technical means, combined with in-situ observation of lake flow, to deeply study the hydrodynamic characteristics of Yilong Lake and the migration and diffusion laws of pollutants entering the lake. It preliminarily reveals the spatiotemporal evolution characteristics and causes of water quality in Yilong Lake. Among them, insufficient total water resources and inappropriate scheduling and operation management are the main factors affecting the interannual fluctuation of water quality in Yilong Lake and gradually transitioning to a closed lake. The unfavorable lake flow pattern and the source composition of different characteristic pollutants are the most critical factors driving the spatiotemporal distribution differences of water quality in Yilong Lake. The external factors that input with rainfall runoff The abnormal proliferation and synthesis of phytoplankton in the lake area, as well as the release of a large amount of endogenous loads from lake sediment, are important driving factors for the deterioration and rapid return of water quality in Yilong Lake in 2021. Therefore, increasing the amount of clean water resources and inflow and outflow in the basin, accelerating the treatment of endogenous and terrestrial pollutants in the lake, and strengthening the control of water quality concentration in the main rivers entering the lake during the rainy season, It is the key to achieving rapid deterioration and continuous improvement of water quality in the lake area in the near future.
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