| 摘要: |
| 总磷作为长江经济带地表水的首要污染物,一直备受关注,开展东洞庭湖及长江湖南段总磷分布与通量调查具有重要的意义。2021年8月(丰水期),对入湖出湖口、湖体核心区和长江湖南段全面开展大规模专项调查与分析,结果表明:入东洞庭湖的来水总磷浓度高于湖体核心区域平均浓度,部分入湖水体所汇入的总磷通量对东洞庭湖的总磷增量贡献相对较大;东洞庭湖核心区域西边部分水域总磷平均浓度比东边岳阳城区沿线水域总磷平均浓度更高;长江干流湖南段右岸总磷浓度略低于左岸(靠湖北):该时段洞庭湖汇入长江的水体总磷浓度低于长江干流上游来水总磷浓度,洞庭湖出水有利于降低长江干流总磷浓度;该时段长江干流湖南段其他排口对长江干流总磷输入贡献相对较小。笔者针对调查分析结果提出了污染防治建议。 |
| 关键词: 洞庭湖 长江湖南段 总磷 通量 调查分析 |
| DOI： |
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| 基金项目:湖南省科技创新计划项目“蓝藻水华监测预警与应急处置体系研究” (2023SK2062) |
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| Investigation and analysis of total phosphorus distribution and contribution in Dongting Lake and the Hunan section of the Yangtze River during the flood season |
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| Abstract: |
| Total phosphorus, as the primary pollutant in the surface water of the Yangtze River Economic Belt, has always been of great concern. Conducting investigations on the distribution and flux of total phosphorus in Dongting Lake while the Hunan section of the Yangtze River is of great significance. In August 2021 (flood season), a large-scale special investigation and analysis was conducted on there. The results showed that the total phosphorus concentration in the incoming water of Dongting Lake was higher than the average concentration in the core area of the lake, and the total phosphorus flux from some incoming water bodies contributed relatively more to the total phosphorus increment of Dongting Lake. The average concentration of total phosphorus in the western part of the core area of Dongdongting Lake is higher than that along the Yueyang urban area in the east; The total phosphorus concentration on the right bank of the main stream of the Yangtze River in the Hunan section is slightly lower than that on the left bank (near Hubei). During this period, the total phosphorus concentration in the water body of Dongting Lake that flows into the Yangtze River is lower than that in the upstream water of the main stream of the Yangtze River. The effluent of Dongting Lake is conducive to reducing the total phosphorus concentration in the main stream of the Yangtze River. The contribution of outlets in the Hunan section of the Yangtze River percentage was relatively small. The manuscript demonstrated pollution prevention and control suggestions based on the investigation and analysis results. |
| Key words: Dongting Lake Hunan section of the Yangtze River Total phosphorus Contribution Investigation and analysis |
