| 引用本文: | 任鹏,范中亚,杨忠勇,朱士江,王文才,崔玉洁,和玉芳.沿江城市中小型闸控通江湖泊总磷变化特征及成因分析——以安庆市石塘湖为例.湖泊科学,2023,35(4):1359-1369. DOI:10.18307/2023.0427 |
| Ren Peng,Fan Zhongya,Yang Zhongyong,Zhu Shijiang,Wang Wencai,Cui Yujie,He Yufang.Variation characteristics and causes of total phosphorus in small and medium-sized gate-controlled lakes along the Yangtze River—A case study of Lake Shitang in Anqing City. J. Lake Sci.2023,35(4):1359-1369. DOI:10.18307/2023.0427 |
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| 沿江城市中小型闸控通江湖泊总磷变化特征及成因分析——以安庆市石塘湖为例 |
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任鹏1,2, 范中亚3, 杨忠勇1, 朱士江1, 王文才3, 崔玉洁1, 和玉芳4
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1.三峡大学, 三峡库区生态环境教育部工程研究中心, 宜昌 443002;2.浙江华东工程咨询有限公司, 杭州 311122;3.生态环境部华南环境科学研究所, 广州 510655;4.河北省水利规划设计研究院有限公司, 石家庄 050021
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| 摘要: |
| 长江中下游沿江城郊闸控湖泊普遍面临总磷浓度偏高的现象,解析其总磷时空变化特征及影响驱动机制成为精准治理与修复此类湖泊前亟待解决的关键性问题。本文基于安庆市沿江城郊中小型闸控湖泊--石塘湖实测气象降雨、水文、河湖水质等数据,采用多因子相关性分析、变异系数法和主成分分析的方法,研究各指标因子与湖泊总磷浓度时空变化的响应关系。结果表明:(1)湖泊水质呈现丰(5-8月)、平(3-4月和9-10月)、枯(11-次年2月)水期聚类效果显著,但湖泊空间差异不明显;湖泊水质的季节性变化受总磷浓度变化控制,其他理化指标影响较弱。(2)高强度降雨和汛期闸站调度下的水动力变化决定污染物迁移速率,是导致湖泊总磷浓度在丰水期更容易受入湖河流输入影响而达到峰值的主要驱动因子。(3)高强度人类活动导致入湖河流季节性输入是石塘湖总磷上升的决定性因素,从单位土地利用类型产生单位总磷负荷来看,农业用地远大于城镇建设用地,林地和草地充当污染物进入湖泊的预前“汇”。因此,从治理策略和途径来看,可在控制外源输入的同时,适当调节闸站以减弱丰水期水动力强度,减少入湖河流总磷输入影响的同时,发挥湖泊营养盐的滞留净化能力。本文主要从人类活动导致的外源污染及闸站抽排调度角度分析沿江城郊闸控湖泊石塘湖总磷变化、影响因素及驱动机制,可以为此类城郊中小型沿江闸控型湖泊污染治理提供理论参考。 |
| 关键词: 总磷 闸站调度 水动力 驱动机制 石塘湖 长江 |
| DOI：10.18307/2023.0427 |
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| 基金项目:国家自然科学基金项目(52009066,U2040220)、长江生态环境保护修复联合研究项目(第一期)(2019-LHYJ-01-0212,2019-LHYJ-01-0212-17)、长江生态保护与修复安全驻点研究项目(2018CJA030301-014)、长江科学院开放研究基金项目(CKWV20221003/KY)和湖北省高校优秀中青年科技创新团队项目(T2021003)联合资助。[ZK)] |
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| Variation characteristics and causes of total phosphorus in small and medium-sized gate-controlled lakes along the Yangtze River—A case study of Lake Shitang in Anqing City |
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Ren Peng1,2, Fan Zhongya3, Yang Zhongyong1, Zhu Shijiang1, Wang Wencai3, Cui Yujie1, He Yufang4
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1.Engineering Research Center of Eco-Environment in Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, P. R. China;2.Power China Zhejiang Huadong Engineering Consulting Corporation Limited, Hangzhou 311122, P. R. China;3.South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, P. R. China;4.Hebei Water Resources Planning and Design Institute Co. LTD, Shijiazhuang 050021, P. R. China
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| Abstract: |
| The gate-controlled lakes along the middle and lower reaches of theYangze River are generally facing with the phenomenon of high total phosphorus concentration. Analyzing the spatiotemporal variation characteristics and impact driving mechanisms of total phosphorus has become a key issue that needs to be urgently addressed before precise governance and restoration of such lakes. Based on the measured meteorological rainfall, hydrology, water quality and other data of Lake Shitang, a small and medium-sized gate-controlled lake in the suburbs of Anqing City along the Yangtze River, this paper uses the methods of multi factor correlation analysis, coefficient of variation and principal component analysis to study the response relationship between each index factor and the temporal and spatial changes of total phosphorus concentration in the lake. The results show that: (1) the clustering effect of lake water quality is significant during the abundant (May-August), flat (March-April and September-October), and dry (November-February of the following year), but the spatial differences of lakes are not significant. The seasonal changes in lake water quality are controlled by changes in total phosphorus concentration, while other physical and chemical indicators have a weaker impact. (2) The hydrodynamic changes under high intensity rainfall and flood season gate station scheduling determine the migration rate of pollutants, which is the main driving factor that makes the total phosphorus concentration in lakes more susceptible to the impact of river input during the flood season and reaches its peak. (3) The seasonal input of rivers entering the lake caused by high-intensity human activities is the decisive factor for the increase of total phosphorus in Lake Shitang. From the perspective of the unit total phosphorus load generated by unit land use type, agricultural land is far greater than urban construction land, and forest and grassland serve as the pre sink of pollutants entering the lake. Therefore, from the perspective of governance strategies and approaches, it is possible to control external inputs while appropriately adjusting gate stations to reduce the hydrodynamic intensity during the high water season, reduce the impact of total phosphorus input into rivers entering the lake, and at the same time, exert the retention and purification capacity of lake nutrients. This article mainly analyzes the changes, influencing factors, and driving mechanisms of total phosphorus in Lake Shitang, a gate controlled lake in the suburbs of the Yangtze River, from the perspective of external pollution caused by human activities and gate station discharge scheduling. It can provide theoretical reference for the pollution control of small and medium-sized gate controlled lakes in such suburbs. |
| Key words: Total phosphorus regulation station hydrodynamic driving mechanism Lake Shitang Yangtze River |
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