Simulation Study on Nitrogen and Phosphorus Reycling Response of Changing Dissolved Oxygen Concentration in Lake Dianchi

被引：0
|
作者：
Hu M. [1 ]
Zhu T. [2 ]
Jiang Q. [1 ]
Zou R. [3 ,4 ,5 ]
Wu Z. [1 ]
Zhang X. [1 ]
Ye R. [5 ]
Liu Y. [1 ]
机构：
[1] College of Environmental Science and Engineering, State Environmental Protection Key Laboratory of All Materials Flux in Rivers, Beijing
[2] Kunming Dianchi Investment Co., Ltd, Kunming
[3] Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Kunming
[4] Beijing Inteliway Co., Ltd, Beijing
[5] Nanjing Innotwater Environmental Technology Co., Ltd, Nanjing
来源：
Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2021年 / 57卷 / 03期
关键词：
Dissolved oxygen (DO); Lake Dianchi; Nitrogen and phosphorus cycle; Sediment release; Water quality model;
D O I：
10.13209/j.0479-8023.2021.024
中图分类号：
学科分类号：
摘要：
A three-dimensional hydrodynamic-water quality model of Lake Dianchi was used to simulate the dynamic process of lake hydrodynamics and water quality, identify the characteristics of dissolved oxygen (Do) in the lake water. Combined with the setting of the external load reduction scenario, the effects of dissolved oxygen on the endogenous release of sediment and the cycle of nitrogen and phosphorus were explored. The results are conckyded. 1) The severe hypoxia in Lake Dianchi from June to September is caused by a combination of algae outbreaks and obstructed oxygen transport in the water. 2) Dissolved oxygen regulates the release of nitrogen and phosphorus nutrients in the sediment, and then significantly affects the concentration of nitrogen and phosphorus in the bottom water. 3) The improvement of the hypoxia condition at the bottom of the lake has high requirements on the reduction of external load. 4) The dissolved oxygen concentration at the phosphorus absorption-release equilibrium point of the sediment is about 3.3 mg/L, and the change in nitrogen concentration in Lake Dianchi is more susceptible to external load. © 2021 Peking University.
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页码：481 / 488
页数：7
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