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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.


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Change of split ratio of North Channel (%) under different discharge grades from 2005–2012.
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ijerph-12-09357-f002: Change of split ratio of North Channel (%) under different discharge grades from 2005–2012.

Mentions: The split ratio of the North Channel (SRNC) is a proportion of discharge of the North Channel in the total river discharge. Historical data showed that SRNC, affected by the morphology of the North Channel and the South Channel, was 70% during the drought period and 30% during the flood period before 1990. But SRNC had a big change in recent years. We counted SRNC by daily discharge under different grades of discharge of Zhuqi Station from 2005–2012 (Figure 2). The results showed that SRNC had a negative correlation with river discharge at the same hydrological year, for example, SRNC decreased from 108% to 29% while river discharge of Zhuqi increased from 0–500 m3·s−1 to 5000~ m3·s−1 in 2006; this is because the average width of the South Channel is wider than the North Channel, but the average bottom elevation of the North Channel is 2–3 m deeper than the South Channel, which makes SRNC bigger during the drought period than during the flood period.


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)

Change of split ratio of North Channel (%) under different discharge grades from 2005–2012.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-09357-f002: Change of split ratio of North Channel (%) under different discharge grades from 2005–2012.
Mentions: The split ratio of the North Channel (SRNC) is a proportion of discharge of the North Channel in the total river discharge. Historical data showed that SRNC, affected by the morphology of the North Channel and the South Channel, was 70% during the drought period and 30% during the flood period before 1990. But SRNC had a big change in recent years. We counted SRNC by daily discharge under different grades of discharge of Zhuqi Station from 2005–2012 (Figure 2). The results showed that SRNC had a negative correlation with river discharge at the same hydrological year, for example, SRNC decreased from 108% to 29% while river discharge of Zhuqi increased from 0–500 m3·s−1 to 5000~ m3·s−1 in 2006; this is because the average width of the South Channel is wider than the North Channel, but the average bottom elevation of the North Channel is 2–3 m deeper than the South Channel, which makes SRNC bigger during the drought period than during the flood period.

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