Jiang Zhi, Liu Chang, Wang Shiyan, Li Cunwu, Zou Jiaxiang, Li Budong, Wu Weixiong
State Key Laboratory of Simulation and Regulation of River Basin Water Cycle, China Institute of Water Resources and Hydropower Research, Beijing 100038, China E-mail:
Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Water Sci Technol. 2022 Apr;85(8):2398-2411. doi: 10.2166/wst.2022.101.
Nitrogen (N) and phosphorus (P) concentrations are the fundamental factors affecting the nutrient status and productivity of lakes, and extrinsic inputs of N and P primarily cause eutrophication of lakes. In this essay, taking Hongze Lake as the study area, a two-dimensional hydrodynamic and water quality mathematical model of Hongze Lake was constructed, and based on calibration and verification of parameters, numerical simulation was performed on the changes in N and P concentrations in this lake after water transfer. The study results exhibited that before and after project construction, the absolute values of rates of changes in the annual average concentrations of ammonia nitrogen (NH-N), total phosphorus (TP), total nitrogen (TN), and permanganate index (COD) in Hongze Lake were all lower than 20%, which demonstrates marginal changes in the annual average concentrations. By analyzing the seasonal and spatial distribution characteristics of the concentrations of N, P and other pollutants in the lake area before and after the project operation, it is found that the main reasons that affect the water quality change in the lake area after the project operation are the newly added water transfer volume, water transfer location, and water transfer quality.
氮（N）和磷（P）浓度是影响湖泊营养状况和生产力的基本因素，而N和P的外部输入是湖泊富营养化的主要原因。本文以洪泽湖为研究区域，构建了洪泽湖二维水动力和水质数学模型，并在参数校准和验证的基础上，对调水后该湖N和P浓度的变化进行了数值模拟。研究结果表明，工程建设前后，洪泽湖氨氮（NH-N）、总磷（TP）、总氮（TN）和高锰酸盐指数（COD）年均浓度变化率的绝对值均低于20%，表明年均浓度变化不大。通过分析工程运行前后湖区N、P等污染物浓度的季节和空间分布特征，发现影响工程运行后湖区水质变化的主要原因是新增调水量、调水位置和调水水质。
