Limits...
Factors Contributing to Hypoxia in the Minjiang River Estuary, Southeast China.

Zhang P, Pang Y, Pan H, Shi C, Huang Y, Wang J - Int J Environ Res Public Health (2015)

Bottom Line: Dissolved oxygen (DO) is not only a fundamental parameter of coastal water quality, but also an indication of organics decomposed in water and their degree of eutrophication.There has been a concern about the deterioration of dissolved oxygen conditions in the Minjiang River Estuary, the longest river in Fujian Province, Southeast China.In this study, the syntheses effects on DO was analyzed by using a four year time series of DO concentration and ancillary parameters (river discharge, water level, and temperature) from the Fuzhou Research Academy of Environmental Sciences, at three automated stations along the Minjiang River Estuary.

View Article: PubMed Central - PubMed

Affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China. zhap2014@163.com.

ABSTRACT
Dissolved oxygen (DO) is not only a fundamental parameter of coastal water quality, but also an indication of organics decomposed in water and their degree of eutrophication. There has been a concern about the deterioration of dissolved oxygen conditions in the Minjiang River Estuary, the longest river in Fujian Province, Southeast China. In this study, the syntheses effects on DO was analyzed by using a four year time series of DO concentration and ancillary parameters (river discharge, water level, and temperature) from the Fuzhou Research Academy of Environmental Sciences, at three automated stations along the Minjiang River Estuary. Hypoxia occurred exclusively in the fluvial sections of the estuary during the high temperature and low river discharge period and was remarkably more serious in the river reach near the large urban area of Fuzhou. Enhancement of respiration by temperature and discharge of domestic sewage and industrial wastewater, versus regeneration of waters and dilution of pollutant concentration with increased river discharge, which regarded as the dominant antagonist processes that controlled the appearance of seasonal hypoxia. During the high temperature and the drought period, minimal mainstream flow above 700 m(3)Ÿs(-1), reduction of pollutants and forbidding sediment dredging in the South Channel should be guaranteed for strong supports on water quality management and drinking water source protection.

No MeSH data available.


Related in: MedlinePlus

Observed average concentration of DO during the summer and the autumn period (June–November, triangle) and during the winter and the spring period (December–May, circle) along the estuary from 1995–2013. The North Channel (black line) and the South Channel (gray line) were plotted, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4555285&req=5

ijerph-12-09357-f005: Observed average concentration of DO during the summer and the autumn period (June–November, triangle) and during the winter and the spring period (December–May, circle) along the estuary from 1995–2013. The North Channel (black line) and the South Channel (gray line) were plotted, respectively.

Mentions: Contrary to weekly averaged data of three stations, water quality of seven routine monitoring points in the Minjiang River as shown in Figure 5 from 1995–2013, revealed the evolution of water quality along the Minjiang River. To separate the effect of temperature, average concentration of DO was analyzed during the high temperature seasons (June–November) and the low temperature seasons (December–May) along the estuary. The averaged DO at different monitoring points (except the Shuikou point) was 0.76–1.39 mg·L−1 higher in summer and autumn than in winter and spring. As the river discharge outlet was located at the bottom of Shuikou Dam, DO at Shuikou was low. However, the reaeration rate was far greater than oxygen consumption rate in the river because of the great momentum of river discharge and relatively low biochemical reaction due to its good water quality. As a result, averaged DO was increased to more than 5.5 mg·L−1 at Geyangkou, located 9.1 km from Shuikou Dam. DO would be further increased until the discharge flow running into the bifurcated channel of the Minjiang River. In the fluvial section of the North Channel around the municipal district of Fuzhou, DO was decreased significantly.


Factors Contributing to Hypoxia in the Minjiang River Estuary, Southeast China.

Zhang P, Pang Y, Pan H, Shi C, Huang Y, Wang J - Int J Environ Res Public Health (2015)

Observed average concentration of DO during the summer and the autumn period (June–November, triangle) and during the winter and the spring period (December–May, circle) along the estuary from 1995–2013. The North Channel (black line) and the South Channel (gray line) were plotted, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555285&req=5

ijerph-12-09357-f005: Observed average concentration of DO during the summer and the autumn period (June–November, triangle) and during the winter and the spring period (December–May, circle) along the estuary from 1995–2013. The North Channel (black line) and the South Channel (gray line) were plotted, respectively.
Mentions: Contrary to weekly averaged data of three stations, water quality of seven routine monitoring points in the Minjiang River as shown in Figure 5 from 1995–2013, revealed the evolution of water quality along the Minjiang River. To separate the effect of temperature, average concentration of DO was analyzed during the high temperature seasons (June–November) and the low temperature seasons (December–May) along the estuary. The averaged DO at different monitoring points (except the Shuikou point) was 0.76–1.39 mg·L−1 higher in summer and autumn than in winter and spring. As the river discharge outlet was located at the bottom of Shuikou Dam, DO at Shuikou was low. However, the reaeration rate was far greater than oxygen consumption rate in the river because of the great momentum of river discharge and relatively low biochemical reaction due to its good water quality. As a result, averaged DO was increased to more than 5.5 mg·L−1 at Geyangkou, located 9.1 km from Shuikou Dam. DO would be further increased until the discharge flow running into the bifurcated channel of the Minjiang River. In the fluvial section of the North Channel around the municipal district of Fuzhou, DO was decreased significantly.

Bottom Line: Dissolved oxygen (DO) is not only a fundamental parameter of coastal water quality, but also an indication of organics decomposed in water and their degree of eutrophication.There has been a concern about the deterioration of dissolved oxygen conditions in the Minjiang River Estuary, the longest river in Fujian Province, Southeast China.In this study, the syntheses effects on DO was analyzed by using a four year time series of DO concentration and ancillary parameters (river discharge, water level, and temperature) from the Fuzhou Research Academy of Environmental Sciences, at three automated stations along the Minjiang River Estuary.

View Article: PubMed Central - PubMed

Affiliation: College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China. zhap2014@163.com.

ABSTRACT
Dissolved oxygen (DO) is not only a fundamental parameter of coastal water quality, but also an indication of organics decomposed in water and their degree of eutrophication. There has been a concern about the deterioration of dissolved oxygen conditions in the Minjiang River Estuary, the longest river in Fujian Province, Southeast China. In this study, the syntheses effects on DO was analyzed by using a four year time series of DO concentration and ancillary parameters (river discharge, water level, and temperature) from the Fuzhou Research Academy of Environmental Sciences, at three automated stations along the Minjiang River Estuary. Hypoxia occurred exclusively in the fluvial sections of the estuary during the high temperature and low river discharge period and was remarkably more serious in the river reach near the large urban area of Fuzhou. Enhancement of respiration by temperature and discharge of domestic sewage and industrial wastewater, versus regeneration of waters and dilution of pollutant concentration with increased river discharge, which regarded as the dominant antagonist processes that controlled the appearance of seasonal hypoxia. During the high temperature and the drought period, minimal mainstream flow above 700 m(3)Ÿs(-1), reduction of pollutants and forbidding sediment dredging in the South Channel should be guaranteed for strong supports on water quality management and drinking water source protection.

No MeSH data available.


Related in: MedlinePlus