Xu Chen, Wan Rongrong, Yang Guishan, Lv Wen, Ma Qian, Li Bing
Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China E-mail:
Suzhou Substation of Jiangsu Province Hydrology and Water Resources Investigation Bureau, Suzhou 215006, China.
Water Sci Technol. 2019 Feb;79(3):544-555. doi: 10.2166/wcc.2018.201.
Total phosphorus (TP) standards for lakes differ from those for rivers in GB3838-2002. This disjunction may lead to the failure of lake-water quality improvement plans that control nutrient inputs from inflow rivers. With monthly monitoring data for the period 2009-2015, Northwest Lake Taihu was regarded as a case study and the BATHTUB model was utilised to simulate the correspondence between concentrations of TP in the lake and in its inflow rivers. A control plan for TP in Northwest Lake Taihu's inflow rivers is proposed. To guarantee the fulfillment of the control goals of TP in the lake, concentration of TP in the inflow rivers of North Zone, Zhushan Bay, Meiliang Bay and Gonghu Bay should be reduced by 50%, 58%, 18% and 11%, respectively, and TP flux loads should be maintained under 227.35, 173.39, 113.69 and 90.62 ta, respectively. Meanwhile, total TP influxes from Northwest Lake Taihu should be maintained under 604.63 ta. A control plan that is more restrictive than GB3838-2002 should be proposed to address the TP pollution of the lake. This research provides the foundation for quantifying reduction of the nutrient loading from the catchment and for maintaining Lake Taihu and other typical eutrophic lakes.
GB3838 - 2002中湖泊的总磷（TP）标准与河流的不同。这种脱节可能导致控制入湖河流养分输入的湖泊水质改善计划失败。以2009 - 2015年的月度监测数据为基础，以太湖西北部为例，利用BATHTUB模型模拟湖泊及其入湖河流中TP浓度之间的对应关系。提出了太湖西北部入湖河流的TP控制计划。为确保湖泊TP控制目标的实现，北区、竺山湾、梅梁湾和贡湖湾入湖河流中的TP浓度应分别降低50%、58%、18%和11%，TP通量负荷应分别维持在227.35、173.39、113.69和90.62吨以下。同时，太湖西北部的总TP入湖量应维持在604.63吨以下。应提出比GB3838 - 2002更严格的控制计划，以解决湖泊的TP污染问题。该研究为量化流域养分负荷削减以及维护太湖和其他典型富营养化湖泊提供了依据。
