环境科技

为探究不同因子下通江河流排涝泵站排涝水对干流水环境的影响范围，合理确定建设规模，以泰州市某排涝泵站扩建工程为例，构建区域二维水环境数学模型，在保障取水口断面Ⅱ类水质达标的基础上，系统模拟不同泵站规模、排涝阶段水质及长江来水情景下的污染物扩散过程。结果表明，TP为决定污染带范围的关键指标；纵向达标距离与排涝流量呈幂函数正相关，决定系数均高于0.97，且在不同长江来水情景下存在规律性差异；基于模型反算，当泵站扩建规模不超过13 m³/s时，下游1 480 m处取水口断面水质可稳定达标。

In order to investigate the extent to which drainage from a pumping station located in a river connected to the Yangtze River affects the water environment of the mainstream under different influencing factors, and to reasonably determine the appropriate construction scale, a regional two-dimensional water environment mathematical model was developed using the expansion project of a certain drainage pumping station in Taizhou City as a case study. On the basis of ensuring that the water quality at the water intake section meets the Class II standard, the model systematically simulated the process of pollutant diffusion under various conditions, including different pumping station scales, water quality characteristics during different drainage stages, and varying Yangtze River inflow scenarios. The results indicate the following: Total phosphorus is the key indicator that determines the extent of the pollution zone;The longitudinal compliance distance exhibits a power-law positive correlation with the drainage flow rate, with the coefficients of determination exceeding 0.97 in all cases, and it shows regular differences under different Yangtze River inflow scenarios;Based on inverse modeling using the developed model, when the expanded capacity of the pumping station does not exceed 13 m³/s, the water quality at the water intake section, which is located 1,480 m downstream, can stably meet the required standard.