Change characteristics of DSi and nutrition structure at the Yangtze River Estuary after Three Gorges Project impounding and their ecological effect

Li, Lei; Shen, Xiaoyun; Jiang, Mei

doi:10.1515/aep-2017-0012

Cited by 3 publications

(1 citation statement)

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“…With a length of over 6000 km, the Yangtze River has hundreds of large dams (higher than 15 m; Li et al, 2017;Ran et al, 2017). Three Gorges Reservoir (TGR), one of the largest hydropower complex projects in the world, has signi cantly reversed the seasonal changes in natural hydrology; in its operation, the water level is arti cially regulated to a low level for the need of hydropower energy or ood control in summer and a high level for stable water supply or navigation in winter (Han et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Long-term impacts of reservoir operation on the spatiotemporal variation in nitrogen forms in the post-Three Gorges Dam period (2004–2016)

Nie

Chen

Niu

et al. 2021

Environ Sci Pollut Res

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Nitrogen (N) is an essential nutrient limiting life, and its biochemical cycling and distribution in rivers have been markedly affected by river engineering construction and operation. Here, we comprehensively analyzed the spatiotemporal variations and driving environmental factors of N distributions based on the long-term observations (from 2004 to 2016) of seven stations in the Three Gorges Reservoir (TGR). In the study period, the overall water quality status of the river reach improved, whereas N pollution was severe and tended to be aggravated after the TGR impoundment. The anti-seasonal reservoir operation strongly affected the variations in N forms. The total nitrogen (TN) concentration in the mainstream of the Yangtze River continuously increased, although it was still lower than that in the incoming tributaries (Wu and Jialing rivers). Further analysis showed that this increase occurred probably because of external inputs, including the upstream (76%), non-point (22%), and point source pollution inputs (2%). Besides, different N forms showed signi cant seasonal variations; among them, the TN and nitrate nitrogen concentrations were the lowest in the impoundment season (October-February), and the ammonia nitrogen concentrations were the highest in the sluicing season (March-May). These parameters varied likely because of internal N transformation. Redundancy analysis revealed that the water level regulated by the anti-seasonal operation was the largest contributor. Our ndings could provide a basis for managing and predicting the water quality in the Yangtze River.

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Section: Introductionmentioning

confidence: 99%