The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

Zeng, Qinghui; Qin, Lang; Li, Xuyong

doi:10.1016/j.scitotenv.2015.07.042

Cited by 82 publications

(34 citation statements)

References 38 publications

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“…In these seasons, internal P loading and temperature is suitable for phytoplankton growth; Microcystis is known to be affected by temperature and Oscillatoria is affected by total dissolved phosphorus (Su et al 2014). In late summer (August to September), algal blooms are likely to appear, consistent with the May to October bloom predictions of Zeng et al (2015). Similarly, Nürnberg and LaZerte (2016) used mass balance method to calculate Lake Winnipeg, yielding internal P loading for the whole lake.…”

Section: Discussionmentioning

confidence: 80%

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Qin

Zeng

Zhang

et al. 2016

Environ Sci Pollut Res

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Much attention had been paid to reducing external loading of nutrients to improve water quality, while internal loading from sediment, which has been largely neglected, is also an important source for water eutrophication. The internal load in deep lakes or reservoirs is not easy to be detected and be quantified. In this study, three different methods (mass balance method, Fick's law, and regression equation) were combined to calculate the gross or/and net P release from sediment using limited data. Our results indicated that (1) ); (2) Hot periods of sediment releasing were suggested to occur from March to April and from August to September, which correspond to periods of high risks of algae blooms. The remaining months of the year were shown as net nutrient retention; (3) for the whole region, Baihedam and Chaohekuqu were identified as zones with a higher possibility to release P from sediment. (4) P loading to the Miyun Reservoir was greater in the inflow than in the outflow, suggesting a portion of the inflow P load was retained in the water or sediment; hence, release of sediment P may continue to be a major source of phosphorus in the future.

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Section: Discussionmentioning

confidence: 80%

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Qin

Zeng

Zhang

et al. 2016

Environ Sci Pollut Res

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“…The annual freshwater input into the reservoir is about 0.286 billion m 3 , and the average water residence time of Miyun Reservoir is 3.7 years. Miyun Reservoir is a mountain valley reservoir with a maximum water depth of approximately 40 m. Bottom elevations are higher in the north and lower in the west and south (Zeng et al 2015). Two major inflows to Miyun Reservoir are the Bai River and the Chao River.…”

Section: Study Areamentioning

confidence: 99%

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Zeng

Qin

Bao

et al. 2016

Environ Sci Pollut Res

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Eutrophication is one of the greatest threats to global freshwater ecosystems. The phytoplankton responses to nutrient inputs vary in different water bodies, so it is particularly important to determine the nutrient thresholds and synergistic interactions between nutrients in different freshwater ecosystems. Field sampling and bioassay experiments were conducted to determine the thresholds of soluble reactive phosphorus (SRP), nitrate-nitrogen (NO 3 -N), and ammonium-nitrogen (NH 4 -N) in Miyun Reservoir. A separate nutrient addition bioassay was designed to assess the synergistic interactions between these nutrients. Chlorophyll a (Chl a) concentrations were used to estimate phytoplankton biomass. The results showed the following: (1) nutrient threshold bioassay indicated that eutrophication thresholds of SRP, NO 3 -N, and NH 4 -N should be targeted at below 0.04 mg P L −1 , 0.5 mg N L −1 , and 0.3 mg N L −1 , respectively, to limit the growth of phytoplankton. (2) The stimulatory effect of BNH 4 -N plus P^on phytoplankton biomass was greater than (4) Ammonium was an important factor for the growth of phytoplankton and inputs of both NH 4 -N and NO 3 -N should be reduced to control bloom formation. Our findings imply that although P load reduction is important, appropriate reductions of all forms of N in watershed is recommended in the nutrient management strategy for Miyun Reservoir.

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“…Although some studies indicate that transferred water is safe and has little impact on the trophic state of the receiving water [14], its ecological effectiveness as a nutrient sink providing pollution control and sediment retention will be impacted if the extant inner protection zone is damaged. The inner protection zone may even be turned from an NPS sink to an NPS source [26].…”

Section: Prediction Of the Inner Protection Zone's Defense For N And mentioning

confidence: 99%

“…Numerous ecological changes during inter-basin water transfers have been proposed, including the introduction of nonindigenous species, secondary salinization, disturbances in water chemistry and quality, changes in hydrologic regimes, and alterations of habitats [8,[11][12][13][14][15][16][17][18]. The major concerns of these studies were about the protection of water source regions and transfer canals so as to ensure water safety.…”

Section: Introductionmentioning

confidence: 99%

Decline of N and P Uptake in the Inner Protection Zone of a Terminal Reservoir during Inter-Basin Water Transfers

Yang

Bai

Zhao

et al. 2018

Water

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Inter-basin water transfer projects are designed to relieve water scarcity around the world. However, ecological problems relating to reductions in protection zone functions can occur during inter-basin transfers. This paper uses the largest inter-basin water transfer project in the world, namely, the South-to-North Water Transfer Project (SNWTP) in China, as an example to analyze the variation of Miyun Reservoir's inner protection zone functions when water is transferred. Specifically, a riparian model (RIPAM) coupled with remote sensing data were used to calculate the nitrogen (N) and phosphorus (P) losses due to plant uptake, and these results were validated by in situ survey data. Then, correlations between water levels and N and P removal were analyzed. The results show that water table disturbances resulting from elevated water levels strongly influence the growth of plants and have obvious negative impacts on N and P removal in the inner protection zone. With the implementation of the middle route of the SNWTP, the water level of Miyun will rise to 150 m in 2020, and subsequently, the total net primary productivity (NPP) could decline by more than 40.90% from the level in 2015, while the N and P uptake could decline by more than 53.03% and 43.49%, respectively, from the levels in 2015, according to the modeling results. This will lead to declines in the inner protection zone's defense effectiveness for N and P interception and increases in risks to the security of water resources. The results of this study provide useful knowledge for managing the defense function of the terminal reservoir's inner protection zone and for ensuring that water quality is maintained during the diversion process.

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The potential impact of an inter-basin water transfer project on nutrients (nitrogen and phosphorous) and chlorophyll a of the receiving water system

Cited by 82 publications

References 38 publications

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Critical nutrient thresholds needed to control eutrophication and synergistic interactions between phosphorus and different nitrogen sources

Decline of N and P Uptake in the Inner Protection Zone of a Terminal Reservoir during Inter-Basin Water Transfers

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