摘要
基于滇池外海的三维水动力‒水质模型,模拟湖泊水动力及水质的动态过程,识别湖泊水体中溶解氧特征,并通过设置外部负荷削减情景,探究溶解氧浓度对底泥内源释放以及氮磷循环的影响。结果表明:1)由于藻类爆发与水体氧传输受阻的共同作用,滇池底层水体6—9月间存在较严重的缺氧现象;2)溶解氧调控底泥氮、磷营养物质的释放,进而显著地影响底层水体中氮、磷浓度;3)滇池底层缺氧状况的改善对外部负荷削减要求较高;4)底泥的磷吸收‒释放平衡点溶解氧浓度约为3.3 mg/L,滇池水体中氮浓度的变化更易受外源负荷作用影响。
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.
作者
胡梦辰
朱滔
蒋青松
邹锐
吴桢
张晓玲
叶瑞
刘永
HU Mengchen;ZHU Tao;JIANG Qingsong;ZOU Rui;WU Zhen;ZHANG Xiaoling;YE Rui;LIU Yong(College of Environmental Science and Engineering,State Environmental Protection Key Laboratory of All Materials Flux in Rivers,Beijing 100871;Kunming Dianchi Investment Co.,Ltd,Kunming 650034;Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed,Kunming 650034;Beijing Inteliway Co.,Ltd,Beijing 100080;Nanjing Innotwater Environmental Technology Co.,Ltd,Nanjing 210012)
出处
《北京大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第3期481-488,共8页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
“十三五”规划项目“滇池流域水污染控制工程评估及精准治污决策系统研究”(JKM2019070419)
国家自然科学基金(51779002)
水利部珠江河口动力学及伴生过程调控重点实验室开放研究基金(No.[2017]KJ11)资助
关键词
水质模型
溶解氧
氮磷循环
底泥释放
滇池
water quality model
dissolved oxygen(DO)
nitrogen and phosphorus cycle
sediment release
Lake Dianchi
