scholarly journals Assessment of Water Quality Evolution in the Pearl River Estuary (South Guangzhou) from 2008 to 2017

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 59 ◽  
Author(s):  
Yanping Zhao ◽  
Yumei Song ◽  
Jinli Cui ◽  
Shuchai Gan ◽  
Xi Yang ◽  
...  
Keyword(s):  
Water Quality ◽  
Monitoring Program ◽  
River Estuary ◽  
Oxygen Demand ◽  
Pearl River Estuary ◽  
Control Measures ◽  
Pearl River ◽  
Estuarine Water ◽  
The Pearl River Estuary ◽  
The Pearl River

To control the water pollution in the Pearl River Estuary (PRE), a series of measures have been enacted in recent years. The efficacy of these measures on water quality improvement is, however, currently unknown. To evaluate the variation of water quality in response to the pollution control measures in the PRE during the last decade (2008–2017), our study conducted a long-term monitoring program of estuarine water in the representative city Guangzhou that targeted fecal coliform (F. Coli), biochemical oxygen demand (BOD5), chemical oxygen demand (CODCr), potassium permanganate index (CODMn), petroleum, total nitrogen (TN), ammonia nitrogen (NH3–N) and total phosphorus (TP). In the last decade, F. Coli, BOD5, CODCr and CODMn, petroleum and NH3–N have shown a significant reduction by 78.8%, 50.9%, 37.5%, 18.9%, 75.0% and 25.0%, respectively. In contrast, TN and TP remained stable. Water quality index calculations indicated that the water quality was elevated from the marginal–fair level to the good level, particularly after 2012. The biochemical pollutants and nutrients in the estuarine water most likely originated from the upper river due to the wastewater discharge, fecal pollution and agricultural input. The success of pollutant reduction could thus be attributed to industrial upgrading and relocation, as well as the improvement of the sewage treatment system in Guangzhou. However, efficient approaches to reduce TN pollution should be implemented in the future.

Spatial assessment of water quality using chemometrics in the Pearl River Estuary, China

2017 ◽  
Vol 11 (1) ◽  
pp. 114-126 ◽  
Author(s):  
Meilin Wu ◽  
Youshao Wang ◽  
Junde Dong ◽  
Fulin Sun ◽  
Yutu Wang ◽  
...  
Keyword(s):  
Water Quality ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Spatial Assessment ◽  
The Pearl River Estuary ◽  
The Pearl River

scholarly journals Impacts of anthropogenic inputs on the hypoxia and oxygen dynamics in the Pearl River Estuary

2018 ◽  
Author(s):  
Bin Wang ◽  
Jiatang Hu ◽  
Shiyu Li ◽  
Liuqian Yu ◽  
Jia Huang
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
River Estuary ◽  
Oxygen Demand ◽  
Pearl River Estuary ◽  
Sediment Oxygen Demand ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
Anthropogenic Inputs ◽  
The Pearl River

Abstract. In summer, the Pearl River Estuary experiences hypoxia, largely driven by the high input of freshwater with low dissolved oxygen (DO) and abundant nutrients and particulate organic carbon from the Pearl River network. In this study, we used a well-validated coupled physical-biogeochemical model to study the response of hypoxia and oxygen dynamics to variations of anthropogenic inputs (i.e. DO, nutrients, and particulate organic carbon). Model results showed that hypoxia in the Pearl River Estuary was confined to the shelf off the Modaomen sub-estuary with a hypoxic area of ~ 200 km2 mainly due to the combined effect of re-aeration and sediment oxygen demand. Numerical experiments suggested that hypoxia in the Pearl River Estuary was most sensitive to riverine inputs of particulate organic carbon , followed by DO concentrations and nutrients. Specifically, a 50 % decrease (increase) in riverine input of particulate organic carbon led to a 47 % decrease (64 % increase) in hypoxic area, with the sediment oxygen demand and water column production being the two most important processes contributing to the changes in DO concentration and hypoxic extent. Changes in the riverine inputs of DO and nutrients had little impact on the simulated hypoxia because of the buffering effects of re-aeration, i.e. the re-aeration compensated the changes in surface apparent oxygen utilization (AOU) associated with river-induced variations of oxygen source and sink processes. The Pearl River Estuary features shallow waters (with averaged depth of 10 m) where oxygen provided by the re-aeration could penetrate to bottom waters via vertical diffusion that largely offset the changes in DO contributed by other oxygen source and sink processes. This study highlights the importance of re-aeration in determining the hypoxic extent and the buffering effects of re-aeration in reducing hypoxia variability in shallow estuary.

scholarly journals Dissolved and Particulate Beryllium Isotopes in the Pearl River Estuary: Their Geochemical Behavior in Estuarine Water and Potential Contributions From Anthropogenic Sources

2021 ◽  
Vol 8 ◽  
Author(s):  
Weiyuan Kong ◽  
Liping Zhou ◽  
Georges Aumaître ◽  
Didier Bourlès ◽  
Karim Keddadouche
Keyword(s):  
River Estuary ◽  
Pearl River Estuary ◽  
Transport Processes ◽  
Anthropogenic Sources ◽  
Pearl River ◽  
Anthropogenic Source ◽  
Estuarine Water ◽  
The Pearl River Estuary ◽  
Contamination Levels ◽  
The Pearl River

The ratio of cosmogenic 10Be and its stable isotope 9Be has been used as a proxy of long-term continental weathering fluxes and denudation rates, but transport processes of these isotopes from river water to estuarine water and seawater, as well as interference of potential anthropogenic source of 9Be on natural 10Be/9Be around populated estuaries are not well constrained. Here, we present results of 10Be and 9Be concentrations of dissolved and reactive particulate phase in the Pearl River Estuary (PRE) and its eight major outlets. The concentrations of Cu, Cd, and Pb are also measured, allowing us to assess their contamination levels and anthropogenic source together with 9Be by the geo-accumulation index (Igeo–reac) and enrichment factor (EF). A wide distribution pattern of dissolved 10Be (137–1,194 at/gwater) and 9Be (0.781–8.31 × 10–12 g/gwater) among these outlets is observed. The distribution coefficients (Kd) of both isotopes between sediment and water are in the order of 105, and on average only 5% of 10Be exists as dissolved form. Compared with total meteoric 10Be deposited on the river basin, 23% of the meteoric 10Be is retained while 38% of 10Be finally escape the estuary and is transported into coastal seawater. Despite the high contamination levels of Cu and Cd, the lower Igeo–reac and EF values of 9Be indicate that 9Be is hardly polluted by anthropogenic source. Thus, the 10Be/9Be in the PRE area is mainly associated with natural processes instead of human activities.

Water Quality and Phytoplankton Blooms in the Pearl River Estuary

2006 ◽  
pp. 139-145 ◽  
Author(s):  
Yan Li ◽  
Liangmin Huang ◽  
Jianfang Chen ◽  
Mingjiang Zhou ◽  
Yehui Tan
Keyword(s):  
Water Quality ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
Phytoplankton Blooms ◽  
The Pearl River Estuary ◽  
The Pearl River
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