Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China.
Spatial Information Research Center of Fujian Province, Fuzhou University, Fuzhou 350108, China.
Int J Environ Res Public Health. 2019 Aug 16;16(16):2949. doi: 10.3390/ijerph16162949.
A coupled model is an effective tool to understand the nutrient fate associated with hydrodynamic and ecosystem processes and thereby developing a water resource management strategy. This paper presents a coupled modeling approach that consists of a watershed model and a hydrodynamic model to evaluate the nutrient fate in a river-reservoir system. The results obtained from the model showed a good agreement with field observations. The results revealed that the Shuikou reservoir (Fuzhou, China)exhibited complicated hydrodynamic characteristics, which may induce the pattern of nutrient export. Reservoirs can greatly lower water quality as a result of decreasing water movement. Three scenarios were analyzed for water management. The NH-N (Ammonia Nitrogen) decreased sharply in the outlet of Shuikou reservoir after NH-N level in its tributary was reduced. After removing the farming cages, the water quality of the outlet of Shuikou reservoir was improved significantly. The DO (Dissolved Oxygen) had increased by 3%-10%, NH-N had reduced by 5%-17%, and TP (Total Phosphorus) had reduced by 6%-21%. This study demonstrates that the proposed coupled modeling approach can effectively characterize waterway risks for water management in such a river-reservoir system.
耦合模型是理解与水动力和生态系统过程相关的养分命运并制定水资源管理策略的有效工具。本文提出了一种耦合建模方法，该方法由流域模型和水动力模型组成，用于评估河流-水库系统中的养分命运。模型得到的结果与现场观测结果吻合较好。结果表明，水口水库（中国福州）表现出复杂的水动力特征，这可能导致养分输出模式的出现。水库会由于水的流动性降低而大大降低水质。分析了三种水管理情景。在其支流的 NH-N（氨氮）水平降低后，水口水库的出水口的 NH-N 急剧下降。拆除养殖笼后，水口水库出水口的水质得到显著改善。DO（溶解氧）增加了 3％-10％，NH-N 减少了 5％-17％，TP（总磷）减少了 6％-21％。本研究表明，所提出的耦合建模方法可以有效地描述此类河流-水库系统中的水道风险，以进行水管理。
