环境工程学报2023，Vol.17Issue(12)：3969-3977,9.DOI:10.12030/j.cjee.202309008
金沙江梯级水电站运行后三峡库区总磷通量变化分析
Change of total phosphorus flux in the Three Gorges Reservoir area after the operation of the Jinsha river cascade hydropower station
摘要
Abstract
In the downstream of Jinsha River,four cascade hydropower stations were constructed successively,namely Wudongde,Baihetan,Xiluodu and Xiangjiaba.The construction and operation of these four large-scale hydropower projects had an important impact on the downstream hydrological situation,and in turn affected the migration process of phosphorus.Based on the construction and operation characteristics of four cascade hydropower stations,the research period was divided into two hydropower stations operation stage(2016-2019)and hydropower stations operation stage(2020-2022).By analyzing the changes of total phosphorus(TP)concentration,flow and flux at monitoring stations from Panzhihua to Nanjiguan section in the two stages,the influence of cascade hydropower station on TP flux in the Three Gorges reservoir area was illustrated.Except for the Jialing River inlet section,the TP concentration of the other sections decreased during the four hydropower stations operation stage.The operation of the four hydropower stations further strengthened the regulating effect of the cascade hydropower stations,but the fluctuation of the inflow flow of the Three Gorges is not reduced during the four hydropower stations operation stage,which meant that the influence of the inflow flow of the Three Gorges could not be ignored.Except for the Tuojiang River and Jialing River,the average annual TP flux of the other sections decreased to a certain extent during the four hydropower stations operation stage.The average annual TP flux of the Tuo River in the two hydropower stations operation stage did not change significantly,and the average annual TP flux of the Jialing River in the four hydropower stations operation stage increased by 52％compared with that in the two hydropower stations operation stage.The contribution of Xiangjiaba TP discharge to the TP flux of the Three Gorges reservoir decreased from 31％in the two hydropower stations operation stage to 26％in the four hydropower stations operation stage.It is necessary to pay attention to the source and sink effect of the cascade hydropower station on the Jinsha River and its influence on the TP of the Three Gorges Reservoir.This result can provide a reference for continuous observation of the phosphorus migration in Changjiang river basins after the operation of the cascade hydropower stations.关键词
金沙江/梯级水电站/调蓄作用/三峡库区/总磷通量Key words
Jinsha River/cascade hydropower station/regulating effect/Three Gorges Reservoir/total phosphorus flux分类
资源环境引用本文复制引用
范向军,邓先明,谢国超,覃道品,翟婉盈..金沙江梯级水电站运行后三峡库区总磷通量变化分析[J].环境工程学报,2023,17(12):3969-3977,9.基金项目
中国长江三峡集团有限公司资助项目(0711596) （0711596）
