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Seasonal-Spatial Distribution and Long-Term Variation of Transparency in Xin'anjiang Reservoir: Implications for Reservoir Management.

Wu Z, Zhang Y, Zhou Y, Liu M, Shi K, Yu Z - Int J Environ Res Public Health (2015)

Bottom Line: The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases.The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality.A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir.

View Article: PubMed Central - PubMed

Affiliation: Chun'an Environmental Monitoring Station, Hangzhou 311700, China. caepb@126.com.

ABSTRACT
Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xin'anjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xin'anjiang Reservoir.

No MeSH data available.


Related in: MedlinePlus

Location of Qiandaohu in China and the locations of Chun’an meteorological station (▲) and the transparency observation sites from 1988 to 2013 showing the two data sources: (●) from 1988–2013, the observation sites were located in one inlet (Hangtoudao), and the only outlet of the reservoir (Daba) was used for long-term specific observations; (○) in 2013 and 2014, the observation sites were evenly distributed around the reservoir in winter, spring and summer. The 60 sites were classified into two groups. Type I: located in the adjacent waters of the three incoming rivers, including sites 1–19 and 28–33. Type II: located in the main body of the reservoir, including sites 20–27 and 34–60.
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ijerph-12-09492-f001: Location of Qiandaohu in China and the locations of Chun’an meteorological station (▲) and the transparency observation sites from 1988 to 2013 showing the two data sources: (●) from 1988–2013, the observation sites were located in one inlet (Hangtoudao), and the only outlet of the reservoir (Daba) was used for long-term specific observations; (○) in 2013 and 2014, the observation sites were evenly distributed around the reservoir in winter, spring and summer. The 60 sites were classified into two groups. Type I: located in the adjacent waters of the three incoming rivers, including sites 1–19 and 28–33. Type II: located in the main body of the reservoir, including sites 20–27 and 34–60.

Mentions: Xin’anjiang Reservoir (29°22′–29°50′ N, 118°36′–119°14′ E) was built in 1959 and is located in western Zhejiang Province and southern Anhui Province (Figure 1, star in the upper figure). The reservoir is long and narrow, with many bays, and the greatest length and width of its bays are 150 km and 50 km, respectively. In the reservoir, there are numerous islands (another name given to this reservoir, “Qiandao”, means one thousand islands). Xin’anjiang Reservoir has a water area of 580 km2, a mean depth of 34 m, a water volume of 178.4 × 108 m3, and a catchment area of 10,480 km2 when the water level is 108 m. Xin’anjiang Reservoir provides many ecosystem services and economic development functions including drinking water supply, flood alleviation, power production, and shipping. In addition, the reservoir is an important recreational and aesthetic resource that adds to the economic vitality and quality of life for Chun’an County. Therefore, the protection and long-term monitoring of reservoir water quality are major concerns for local agencies and citizen groups.


Seasonal-Spatial Distribution and Long-Term Variation of Transparency in Xin'anjiang Reservoir: Implications for Reservoir Management.

Wu Z, Zhang Y, Zhou Y, Liu M, Shi K, Yu Z - Int J Environ Res Public Health (2015)

Location of Qiandaohu in China and the locations of Chun’an meteorological station (▲) and the transparency observation sites from 1988 to 2013 showing the two data sources: (●) from 1988–2013, the observation sites were located in one inlet (Hangtoudao), and the only outlet of the reservoir (Daba) was used for long-term specific observations; (○) in 2013 and 2014, the observation sites were evenly distributed around the reservoir in winter, spring and summer. The 60 sites were classified into two groups. Type I: located in the adjacent waters of the three incoming rivers, including sites 1–19 and 28–33. Type II: located in the main body of the reservoir, including sites 20–27 and 34–60.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555293&req=5

ijerph-12-09492-f001: Location of Qiandaohu in China and the locations of Chun’an meteorological station (▲) and the transparency observation sites from 1988 to 2013 showing the two data sources: (●) from 1988–2013, the observation sites were located in one inlet (Hangtoudao), and the only outlet of the reservoir (Daba) was used for long-term specific observations; (○) in 2013 and 2014, the observation sites were evenly distributed around the reservoir in winter, spring and summer. The 60 sites were classified into two groups. Type I: located in the adjacent waters of the three incoming rivers, including sites 1–19 and 28–33. Type II: located in the main body of the reservoir, including sites 20–27 and 34–60.
Mentions: Xin’anjiang Reservoir (29°22′–29°50′ N, 118°36′–119°14′ E) was built in 1959 and is located in western Zhejiang Province and southern Anhui Province (Figure 1, star in the upper figure). The reservoir is long and narrow, with many bays, and the greatest length and width of its bays are 150 km and 50 km, respectively. In the reservoir, there are numerous islands (another name given to this reservoir, “Qiandao”, means one thousand islands). Xin’anjiang Reservoir has a water area of 580 km2, a mean depth of 34 m, a water volume of 178.4 × 108 m3, and a catchment area of 10,480 km2 when the water level is 108 m. Xin’anjiang Reservoir provides many ecosystem services and economic development functions including drinking water supply, flood alleviation, power production, and shipping. In addition, the reservoir is an important recreational and aesthetic resource that adds to the economic vitality and quality of life for Chun’an County. Therefore, the protection and long-term monitoring of reservoir water quality are major concerns for local agencies and citizen groups.

Bottom Line: The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases.The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality.A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir.

View Article: PubMed Central - PubMed

Affiliation: Chun'an Environmental Monitoring Station, Hangzhou 311700, China. caepb@126.com.

ABSTRACT
Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xin'anjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xin'anjiang Reservoir.

No MeSH data available.


Related in: MedlinePlus