Remotely sensed assessment of water quality levels in the Pearl River Estuary, China

Chen, Chuqun; Tang, Shiling; Pan, Zhilin; Zhan, Haigang; Larson, Magnus; Jönsson, Lennart

doi:10.1016/j.marpolbul.2007.03.010

Cited by 57 publications

(33 citation statements)

References 16 publications

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“…Eutrophication index or composite pollution index (CPI) can be used to evaluate the pollution status of a given water body, especially with the issue of eutrophication (Lund 1967;SOA 2011;Zou et al 1985;Chen et al 2007). Coastal water quality in China is dominated by nutrient pollution (SOA 2010(SOA , 2011(SOA , 2013, and, in order to evaluate the overall water quality status in regional waters which can be classified as different water bodies with different WQLs, an area-weighted nutrient pollution index (AWCPI-NP) is proposed in this study (Eq.…”

Section: Area-weighted Water Quality Levelmentioning

confidence: 99%

Interpreting the progressive eutrophication behind the world’s largest macroalgal blooms with water quality and ocean color data

et al. 2015

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World's largest macroalgal blooms (MAB) caused by Ulva prolifera outbreak every summer in the Yellow Sea since 2007, which bring potential damage to regional marine environment and economics. Assessing the evolution of historic eutrophication status is of importance for exploring the reasons for the blooms. In this study, we used an area-weighted nutrient pollution index (AWCPI-NP) and ocean color data to assess temporal changes in eutrophication status in the Yellow Sea basin. Results show that significant shifts occurred from the pre-MAB phase (2001( ) to MAB phase (2007: the average AWCPI-NP was higher than that in the pre-MAB phase (2001)(2002)(2003)(2004)(2005)(2006) by about 45 %; chlorophyll a concentration, an indicator of eutrophication, increased by about 15 % in the region of MAB. Meanwhile, in the Jiangsu Shoal, the origin place of the floating macroalgae, the annual in situ nutrient concentrations increased rapidly from 2000 to 2011. The result obtained through our approach highlights that the MAB in the Yellow Sea might be primarily linked to the progressive eutrophication. In order to reduce this hazard, policy makers should include this new knowledge for an effective countermeasure planning.

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Section: Area-weighted Water Quality Levelmentioning

confidence: 99%

Interpreting the progressive eutrophication behind the world’s largest macroalgal blooms with water quality and ocean color data

et al. 2015

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“…A recent study of water quality assessment from satellite data is reported by using the composite pollution index (CPI) calculated from the measured chemical oxygen demand (COD) and nutrient concentrations. The distribution of water quality levels from the CPI calculation was retrieved from SeaWiFs water-leaving radiance [18]. These studies not only show that the spatial distribution of nutrients, phytoplankton biomass, and dissolved oxygen is highly related to the PRE dynamic interaction with adjacent coastal waters [19,20], but also indicate that water nutrients in Hong Kong's Victoria Harbor are strongly influenced by the PRE discharge and sewage effluent in the wet season from May to September [21,22].…”

Section: Introductionmentioning

confidence: 93%

Investigating the Impacts of Landuse-landcover (LULC) Change in the Pearl River Delta Region on Water Quality in the Pearl River Estuary and Hong Kong’s Coast

Zhang

Wang

et al. 2009

Remote Sensing

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Water quality information in the coastal region of Hong Kong and the Pearl River Estuary (PRE) is of great concern to the local community. Due to great landuse-landcover (LULC) changes with rapid industrialization and urbanization in the Pearl River Delta (PRD) region, water quality in the PRE has worsened during the last 20 years. Frequent red tide and harmful algal blooms have occurred in the estuary and its adjacent coastal waters since the 1980s and have caused important economic losses, also possibly threatening to the coastal environment, fishery, and public health in Hong Kong. In addition, recent literature shows that water nutrients in Victoria Harbor of Hong Kong have been proven to be strongly influenced by both the Pearl River and sewage effluent in the wet season (May to September), but it is still unclear how the PRE diluted water intrudes into Victoria Harbor. Due to the cloudy and rainy conditions in the wet season in Hong Kong, ASAR images will be used to monitor the PRE river plumes and track the intruding routes of PRE water nutrients. In this paper, we first review LULC change in the PRD and then show our preliminary results to analyze water quality spatial and temporal information from remote observations with different sensors in the coastal region and estuary. The study will also emphasizes on time series of analysis of LULC trends related to annual sediment yields and critical source areas of erosion for the PRD region since the 1980s.

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“…As a result mainly of the high level of dissolved inorganic nitrogen (DIN) concentration, the water quality in the PRE and some adjacent areas is water quality level 5 (WQL 5, i.e. the worst polluted water (Chen et al, 2007)), according to the Chinese seawater quality standard (GB 3097-1997) in which water quality is divided into five WQLs. It is thus necessary to understand the process of spatial-temporal variation of environmental indicators in order to find a way to solve the environmental problems and develop new tools for building ecorestoration strategies in the PRE (Huang et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Modelling study on environmental indicators in an estuary

Sun

Lin

Jiang

et al. 2014

Proceedings of the Institution of Civil Engineers - Water Manag

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This paper reports on an investigation of the spatial and temporal variation of main environmental indicators in the Pearl River estuary using a numerical water quality model. An integrated field survey was undertaken in 2006 and 2007, and the data obtained were used to set up and verify the model. The water quality model was driven by a hydrodynamic model in which the monthly average freshwater discharges from eight major entrances were taken into account and the seaward boundary elevations were specified based on eight major tidal constituents. Two environmental indicators -dissolved inorganic nitrogen and chemical oxygen demand -were chosen as nutrient and pollution indicators, respectively, according to the actual pollution conditions. Both land-based sources (carried by the discharges) and air-based sources (wet and dry atmospheric depositions) were included in the water quality model and the processes of advection, diffusion and degradation were also modelled. The model predictions generally agreed well with the sampling data, and existing field and model results. The present contributions of the main sources were investigated and prospective scenarios of pollution reductions were predicted.

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Remotely sensed assessment of water quality levels in the Pearl River Estuary, China

Cited by 57 publications

References 16 publications

Interpreting the progressive eutrophication behind the world’s largest macroalgal blooms with water quality and ocean color data

Interpreting the progressive eutrophication behind the world’s largest macroalgal blooms with water quality and ocean color data

Investigating the Impacts of Landuse-landcover (LULC) Change in the Pearl River Delta Region on Water Quality in the Pearl River Estuary and Hong Kong’s Coast

Modelling study on environmental indicators in an estuary

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