期刊
JOURNAL OF HYDROLOGY
卷 566, 期 -, 页码 484-499出版社
ELSEVIER
DOI: 10.1016/j.jhydrol.2018.09.033
关键词
Eutrophication; Three Gorges Reservoir; Numerical simulation; Water age; Transport process; Chlorophyll a concentration
资金
- National Natural Science Foundation of China [91647210]
- 111 Project [B18031]
- National Key Research and Development Program of China [2016YFC0402506]
- Open Research Fund Program of State Key Laboratory of Hydroscience and Engineering [sklhse-2018-B-02]
After the impoundment of Three Gorges Reservoir, algal blooms frequently occurred in the tributaries of the reservoir, which has posed a great challenge for the local aquatic environment and ecology. To investigate the main causes and key factors of the algal blooms, the Environmental Fluid Dynamics Code (EFDC) model is applied to the simulation of the three-dimensional hydrodynamics and water quality in the Yangtze River and Xiangxi Bay, and the concept of water age is adopted to quantitatively analyze the effects of hydrodynamics on the water quality by linking water age and phytoplankton levels, which has seldom been explored in previous studies. The model results show good agreement with the field data, and the simulation reproduces the thermal stratification and density current in Xiangxi Bay. The results show that Xiangxi Bay exhibits quite complicated hydrodynamic characteristics, and could be divided into different zones according to the transport process. In the upper reach, the water quality is mainly affected by the upstream inflows, while it is mainly affected by the intrusion flow from the mainstream near the river mouth. Water age and water temperature are found to be the key factors influencing the algal blooms in Xiangxi Bay. Besides, a significant positive correlation has been found between the chlorophyll a (chl-a) concentration in the surface layer and the water age of the dominant water source. This conclusion can be adopted to interpret the longitudinal distribution of chl-a concentration and to explain why Xiangxi Bay is susceptible to algal blooms. The correlation between water age and chl-a concentration is further used to evaluate the effectiveness of water level fluctuation in preventing algal blooms. The analyses and findings in this study could help to better understand the complicated hydrodynamic and water quality processes in Xiangxi Bay following the impoundment, and provide insights into ecological and environmental management of Three Gorges Reservoir.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据