Department of Civil and Disaster Prevention Engineering, National United University, Miao-Li, 36003, Taiwan,
Environ Monit Assess. 2014 Dec;186(12):8807-25. doi: 10.1007/s10661-014-4045-6. Epub 2014 Sep 16.
A coupled three-dimensional hydrodynamic and water quality model has been developed and applied to the Danshuei River estuarine system and adjacent coastal sea. The water quality model considers various species of nitrogen, phosphorus, organic carbon, and phytoplankton as well as dissolved oxygen and is driven by a three-dimensional hydrodynamic model. The hydrodynamic and water quality models were validated with observations of water surface elevation, velocity, salinity distribution, and water quality parameters. Statistical error analysis shows that predictions of hydrodynamics, salinity, dissolved oxygen, and nutrients from the model simulation quantitatively agreed with the observed data. The validated model was then applied to predict water quality conditions as a result of a reduction in nutrient loadings based on different engineering strategies. The simulated results revealed that the dissolved oxygen concentration would increase significantly and would be higher than 2 mg/L in the main stream and in three tributaries to meet the minimum statutory requirement for dissolved oxygen. Active estuarine management focused on the reduction of anthropogenic nutrient loads is needed for improvement in water quality.
已开发并应用耦合三维水动力与水质模型于淡水河河口与邻近海域。水质模型考虑了各种氮、磷、有机碳、浮游植物以及溶解氧等物质，由三维水动力模型驱动。水动力与水质模型通过水位、流速、盐度分布和水质参数的观测进行验证。统计误差分析表明，模型模拟的水动力、盐度、溶解氧和营养物质预测与观测数据定量一致。验证后的模型应用于预测水质状况，分析基于不同工程策略的营养负荷减少所带来的影响。模拟结果表明，溶解氧浓度将显著增加，在主流和三条支流中都将高于 2mg/L，以满足溶解氧的最低法定要求。为改善水质，需要积极管理河口，减少人为营养负荷。
