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  • 1
    Language: English
    In: Environmental Monitoring and Assessment, 2008, Vol.140(1), pp.147-159
    Description: Accurate knowledge of the quality and environmental impact of the highway runoff in Pear River Delta, South China is required to assess this important non-point pollution source. This paper presents the quality characterization and environmental impact assessment of rainfall runoff from highways in urban and rural area of Guangzhou, the largest city of Pear River Delta over 1 year’s investigation. Multiple regression and Pearson correlation analysis were used to determine influence of the rainfall characteristics on water quality and correlations among the constituents in highway runoff. The results and analysis indicates that the runoff water is nearly neutral with low biodegradability. Oil and grease (O&G), suspended solids (SS) and heavy metals are the dominant pollutants in contrast to the low level of nutrient constituents in runoff. Quality of highway runoff at rural site is better than that of at urban site for most constituents. Depth and antecedent dry period are the main rainfall factors influencing quality of highway runoff. The correlation patterns among constituents in highway runoff at urban site are consistent with their dominant phases in water. Strong correlations ( r  ≥ 0.80) are found among chemical oxygen demand (COD), total phosphorus, Cu and Zn as well as conductivity, nitrate nitrogen and total nitrogen. O&G, COD, SS and Pb in highway runoff at urban site substantially exceed their concentrations in receiving water of Pear River. The soil directly discharged by highway runoff at rural site has contaminated seriously by heavy metals in surface layer accompanying with pH conversion from original acidic to alkaline at present.
    Keywords: Correlation analysis ; Event mean concentration ; Highway runoff ; Multiple regression ; Rainfall characteristics ; Soil contamination ; Water quality
    ISSN: 0167-6369
    E-ISSN: 1573-2959
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  • 2
    Language: English
    In: The Science of the Total Environment, April 15, 2013, Vol.450-451, p.92(16)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.scitotenv.2013.01.096 Byline: David Kaiser, Daniela Unger, Guanglong Qiu, Haolang Zhou, Huayang Gan Keywords: Macro-tides; Anthropogenic impact; Long-term trend; Flushing; Nutrient pollution; River export Abstract: Global understanding of land-ocean nutrient fluxes increasingly recognizes the disproportionate importance of small rivers. We studied nutrient fluxes from a small catchment in fast developing southern China to uncover effects of land-use. Water was sampled in the macro-tidal estuary of Nanliu River and adjacent Lianzhou Bay in spring and summer of investigate spatial and temporal variations of dissolved nutrients. High riverine concentrations of nitrate (NO.sub.3; up to 220[mu]M) and phosphate (PO.sub.4; up to 3.7[mu]M) mainly originated from agricultural fertilizer input. Riverine dissolved silica (Si; up to 47[mu]M) increased in the oligosaline part of the estuary through human disturbance of bottom sediments. Dissolved organic nitrogen (DON; up to 194[mu]M) and ammonium (NH.sub.4; up to 40[mu]M) concentrations increased within the estuary due to inputs from livestock and mussel beds, respectively. Aquaculture ponds contained high concentrations of NH.sub.4 (up to 355[mu]M) and DON (up to 151[mu]M) but are not an important source to the estuary due to rare wastewater discharge and low absolute nutrient amounts relative to river export. Nutrient concentrations in Lianzhou Bay were low because tidal currents disperse land-derived nutrients offshore into the adjacent Beibu Gulf. A high proportion of regenerated nitrogen in the bay suggests that primary production is sustained by rapid in situ nutrient cycling between primary producers and benthic consumers. High nutrient export makes the Nanliu River an important nutrient source for the north-western South China Sea, despite its proportionately small size. Macro-tide induced short-term concentration changes exceed variability on seasonal and sub-seasonal scales. All nutrients vary inter-annually and between seasons, depending on precipitation-driven river runoff. Total nutrient export to Beibu Gulf coastal waters is stronger during the high discharge period in summer and autumn. In recent years changing nitrogen to phosphorus ratios have alleviated phosphorus limitation in Lianzhou Bay, permitting increased primary productivity. Article History: Received 12 November 2012; Revised 28 January 2013; Accepted 28 January 2013
    Keywords: Ponds ; Rivers ; Fertilizers ; Rain ; Livestock ; Tidal Currents ; Phosphates ; Estuaries
    ISSN: 0048-9697
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Science of the total environment, 2013, Vol.450, pp.92-107
    Description: Global understanding of land–ocean nutrient fluxes increasingly recognizes the disproportionate importance of small rivers. We studied nutrient fluxes from a small catchment in fast developing southern China to uncover effects of land-use. Water was sampled in the macro-tidal estuary of Nanliu River and adjacent Lianzhou Bay in spring and summer of investigate spatial and temporal variations of dissolved nutrients. High riverine concentrations of nitrate (NO₃; up to 220μM) and phosphate (PO₄; up to 3.7μM) mainly originated from agricultural fertilizer input. Riverine dissolved silica (Si; up to 47μM) increased in the oligosaline part of the estuary through human disturbance of bottom sediments. Dissolved organic nitrogen (DON; up to 194μM) and ammonium (NH₄; up to 40μM) concentrations increased within the estuary due to inputs from livestock and mussel beds, respectively. Aquaculture ponds contained high concentrations of NH₄ (up to 355μM) and DON (up to 151μM) but are not an important source to the estuary due to rare wastewater discharge and low absolute nutrient amounts relative to river export. Nutrient concentrations in Lianzhou Bay were low because tidal currents disperse land-derived nutrients offshore into the adjacent Beibu Gulf. A high proportion of regenerated nitrogen in the bay suggests that primary production is sustained by rapid in situ nutrient cycling between primary producers and benthic consumers. High nutrient export makes the Nanliu River an important nutrient source for the north-western South China Sea, despite its proportionately small size. Macro-tide induced short-term concentration changes exceed variability on seasonal and sub-seasonal scales. All nutrients vary inter-annually and between seasons, depending on precipitation-driven river runoff. Total nutrient export to Beibu Gulf coastal waters is stronger during the high discharge period in summer and autumn. In recent years changing nitrogen to phosphorus ratios have alleviated phosphorus limitation in Lianzhou Bay, permitting increased primary productivity. ; p. 92-107.
    Keywords: Fertilizers ; Watersheds ; Trophic Relationships ; Spring ; Nitrogen ; Biogeochemical Cycles ; Estuaries ; Autumn ; Silica ; Sediments ; Dissolved Organic Nitrogen ; Nutrient Transport ; Seasonal Variation ; Mussels ; Nitrates ; Phosphorus ; Primary Productivity ; Humans ; Phosphates ; Rivers ; Nutrient Content ; Livestock ; Tides ; Nutrients ; Ponds ; Runoff ; Summer ; Coastal Water
    ISSN: 0048-9697
    Source: AGRIS (Food and Agriculture Organization of the United Nations)
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  • 4
    Language: English
    In: Science of the Total Environment, 15 April 2013, Vol.450-451, pp.92-107
    Description: Global understanding of land–ocean nutrient fluxes increasingly recognizes the disproportionate importance of small rivers. We studied nutrient fluxes from a small catchment in fast developing southern China to uncover effects of land-use. Water was sampled in the macro-tidal estuary of Nanliu River and adjacent Lianzhou Bay in spring and summer of investigate spatial and temporal variations of dissolved nutrients. High riverine concentrations of nitrate (NO ; up to 220 μM) and phosphate (PO ; up to 3.7 μM) mainly originated from agricultural fertilizer input. Riverine dissolved silica (Si; up to 47 μM) increased in the oligosaline part of the estuary through human disturbance of bottom sediments. Dissolved organic nitrogen (DON; up to 194 μM) and ammonium (NH ; up to 40 μM) concentrations increased within the estuary due to inputs from livestock and mussel beds, respectively. Aquaculture ponds contained high concentrations of NH (up to 355 μM) and DON (up to 151 μM) but are not an important source to the estuary due to rare wastewater discharge and low absolute nutrient amounts relative to river export. Nutrient concentrations in Lianzhou Bay were low because tidal currents disperse land-derived nutrients offshore into the adjacent Beibu Gulf. A high proportion of regenerated nitrogen in the bay suggests that primary production is sustained by rapid in situ nutrient cycling between primary producers and benthic consumers. High nutrient export makes the Nanliu River an important nutrient source for the north-western South China Sea, despite its proportionately small size. Macro-tide induced short-term concentration changes exceed variability on seasonal and sub-seasonal scales. All nutrients vary inter-annually and between seasons, depending on precipitation-driven river runoff. Total nutrient export to Beibu Gulf coastal waters is stronger during the high discharge period in summer and autumn. In recent years changing nitrogen to phosphorus ratios have alleviated phosphorus limitation in Lianzhou Bay, permitting increased primary productivity. ► Small catchments supply high proportion of nutrients to north western South China Sea. ► Hinterland and offshore sources, not intensive aquaculture, dominate nitrogen input. ► Marcotides prevent near-shore eutrophication by dispersing human nutrient inputs. ► Long-term changes in nutrient delivery increased coastal productivity.
    Keywords: Macro-Tides ; Anthropogenic Impact ; Long-Term Trend ; Flushing ; Nutrient Pollution ; River Export ; Environmental Sciences ; Biology ; Public Health
    ISSN: 0048-9697
    E-ISSN: 1879-1026
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  • 5
    Language: English
    In: Marine Geology & Quaternary Geology, 08/28/2010, Vol.30(4), pp.131-140
    Description: The concentration, correlation, spatial distribution and sources of thirteen trace elements in the surface sediments from eight outles of the Pear River estuary were analyzed by multiple statistics; the factors affecting element spatial distribution were also discussed along with the comparison of the element concentration of this study with the sediments from the Pear River, shallow water of South China Sea and other areas. The mean concentration of Sr, Zn, Zr and Ba are higher than 100 mu g/g, while the values of Cd and Hg are lower than 1 mu g/g in surface sediment of Pear River estuary; the values of other analyzed elements lie within the range of 21.5-82.3 mu g/g. Evident correlations exist among Co, Ga ,Zr; Ba, Pb, Ga and between Cu and Ni and Cr and Ni. Factor analysis indicates that weathering of land rock, artificial discharge and marine biology are the main sources of the trace elements in the surface sediments of the Pear River estuary. The spatial distribution of all studied elements except for Sr demonstrates a content decline with the distance from the shore and low values occur in some outlet areas. The source and sedimentary environment are two major factors influencing the distribution of the elements. The mean concentration of all studied trace elements aside from Zr and Sr in the study area exceeds the values from the Pear River and the shallow water of the South China Sea; the mean concentration of Pb, As, Cd and Zn in the study area are appreciably higher than the mean values of shale in the world.
    Keywords: Sediment Chemistry ; Shallow Water ; Estuaries ; Geochemistry ; River Discharge ; Weathering ; Sedimentary Environments ; Estuarine Sedimentation ; Trace Elements ; Rivers ; Fluvial Sediments ; Zinc ; Estuaries ; Cadmium ; Trace Elements ; Spatial Distribution ; Shallow Water ; Lead ; Rivers ; Fluvial Sediments ; Zinc ; Estuaries ; Cadmium ; Trace Elements ; Spatial Distribution ; Shallow Water ; Lead ; Isew, South China Sea ; China, People'S Rep., Zhu R. ; Isew, China, People'S Rep., Guangdong Prov., Zhujiang Estuary ; Marine ; Geochemistry of Sediments ; Network Design ; Sewage ; Ecology/Community Studies;
    ISSN: 0256-1492
    Source: CrossRef
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  • 6
    Language: English
    In: Marine Pollution Bulletin, 15 January 2013, Vol.66(1-2), pp.252-258
    Description: ► Spatial and temporal distributions of As, Cd and Hg were presented. ► Mean sedimentation rates were 0.93–1.37 cm year during 1920s to 2008. ► Metal content increased evidently in 1985–2008 due to anthropogenic impacts. ► Locally the surface sediments have potential ecological risk of As to benthos. Contamination with As, Cd and Hg, their spatial and temporal distribution are reported from the coastal wetland sediments of the northern Beibu Gulf, South China Sea. The content of As, Cd, Hg and TOC in surface sediments is 8.1 ± 5.8 μg g , 0.08 ± 0.14 μg g , 0.034 ± 0.028 μg g and 0.45 ± 0.39%, respectively. The mean sedimentation rates are 0.93–1.37 cm year during 1920s to 2008 determined by Pb and Cs dating in three cores. The vertical profiles of As, Cd and Hg content in the cores retrieved from Qin and Nanliu River estuaries show increasing trends during 1985–2008 due to anthropogenic impact caused by local economic development. Locally the surface sediments have potential ecological risk of As to benthos according to the NOAA sediment quality guidelines.
    Keywords: Trace Metal ; Sediment ; Geochronology ; Coastal Wetland ; Beibu Gulf ; Environmental Sciences ; Oceanography
    ISSN: 0025-326X
    E-ISSN: 1879-3363
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  • 7
    Language: English
    In: Environmental Earth Sciences, 2015, Vol.74(9), pp.6819-6830
    Description: The deposition history, enrichment influence factors, and ecological risk assessment of heavy metals are examined on two sediment cores retrieved from the Xuwen National Coral Reef Nature Reserve, China. 210 Pb ex and 137 Cs dating reveals that the mean sedimentation rate is about 1.5 cm a −1 in the reserve. The concentrations of Pb, Cd, As, and Hg in sediments begin to show evident increasing trends in the 1980s. This is most likely to be caused by the anthropogenic excessive inputs originated from the large-scale development of agricultural chemical usage, coal combustion in cane sugar industry, and marine transportation after the implementation of China open policy in 1979. The annual load of heavy metals received by the reserve in recent years is estimated at about 594 tons, in which Cr and Zn are dominated and account for a proportion of 64 %. Although the ecological risk of heavy metals is assessed as low according to the sediment quality guidelines (China marine sediment quality and US NOAA screening quick reference), appropriate pollution control measures should be undertaken to prevent the occurrences of significant adverse biological effects induced by the continuous accumulations of Pb, Cd, As, and Hg in the sediments of study area.
    Keywords: Heavy metals ; Ecological risk assessment ; Sediment ; Coral reef ; Pb and Cs dating
    ISSN: 1866-6280
    E-ISSN: 1866-6299
    Source: Springer Science & Business Media B.V.
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  • 8
    Language: English
    In: Marine Geology & Quaternary Geology, 2013, Vol.33(3), p.15
    ISSN: 0256-1492
    Source: CrossRef
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  • 9
    Language: English
    In: Environmental Earth Sciences, 11/2015, Vol.74(9), pp.6819-6830
    Description: The deposition history, enrichment influence factors, and ecological risk assessment of heavy metals are examined on two sediment cores retrieved from the Xuwen National Coral Reef Nature Reserve, China. (super 210) Pb (sub ex) and (super 137) Cs dating reveals that the mean sedimentation rate is about 1.5 cm a (super -1) in the reserve. The concentrations of Pb, Cd, As, and Hg in sediments begin to show evident increasing trends in the 1980s. This is most likely to be caused by the anthropogenic excessive inputs originated from the large-scale development of agricultural chemical usage, coal combustion in cane sugar industry, and marine transportation after the implementation of China open policy in 1979. The annual load of heavy metals received by the reserve in recent years is estimated at about 594 tons, in which Cr and Zn are dominated and account for a proportion of 64 %. Although the ecological risk of heavy metals is assessed as low according to the sediment quality guidelines (China marine sediment quality and US NOAA screening quick reference), appropriate pollution control measures should be undertaken to prevent the occurrences of significant adverse biological effects induced by the continuous accumulations of Pb, Cd, As, and Hg in the sediments of study area. Copyright 2015 Springer-Verlag Berlin Heidelberg
    Keywords: Environmental Geology ; Oceanography ; Alkali Metals ; Arsenic ; Asia ; Bedload ; Bioaccumulation ; Cadmium ; Cesium ; Chemical Composition ; Chemical Waste ; China ; Chronology ; Coastal Environment ; Concentration ; Critical Load ; Cs-137 ; Degradation ; Depositional Environment ; Discharge ; Ecosystems ; Environmental Analysis ; Far East ; Guangdong China ; Gulf Of Tonkin ; Hainan China ; Heavy Metals ; Human Activity ; Industrial Waste ; Isotopes ; Lead ; Leizhou Peninsula ; Mercury ; Metals ; Nearshore Environment ; North Pacific ; Northwest Pacific ; Pacific Ocean ; Pb-210 ; Pharmaceutical Waste ; Pollutants ; Pollution ; Protection ; Qingzhou Strait ; Radioactive Fallout ; Radioactive Isotopes ; Risk Assessment ; Sediment Quality ; Sedimentation ; Sedimentation Rates ; Sediments ; Soils ; South China Sea ; Testing ; Toxic Materials ; Waste Disposal ; West Pacific ; Xuwen Coral Reef Reserve ; Yields ; Zhujiang River;
    ISSN: 1866-6280
    E-ISSN: 1866-6299
    Source: Springer (via CrossRef)
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  • 10
    Language: English
    In: Marine Geology, Sept 1, 2014, Vol.355, p.361(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.margeo.2014.07.001 Byline: Yugen Ni, Rudolf Endler, Zhen Xia, Michael Endler, Jan Harff, Huayang Gan, Detlef E. Schulz-Bull, Joanna J. Waniek Abstract: Analysis of high resolution sub-bottom profiles, topographical data and sediment samples reveals that the tidal delta system of Qiongzhou Strait is morphologically a "butterfly delta" system consisting of Western Mouth Tidal Delta (WMTD) and Eastern Mouth Tidal Delta (EMTD). WMTD covers an area of about 11,000km.sup.2, and is more than two times larger than EMTD (4000km.sup.2). WMTD is fan-shaped with a tributary branch extending southwards along Hainan Island, while EMTD is typically fan-shaped. Seismic architectures of WMTD and EMTD are both characterized by a thick progradational unit overlying a thin transgression unit. Both WMTD and EMTD start to develop at about 8.7calkaBP when Qiongzhou Strait completely opened, and have the same three sedimentary facies: tidal delta top, tidal delta slope and tidal delta toe. The formation of WMTD and EMTD is attributed to Qiongzhou Strait's hydrodynamic regime which is dominated by the strong east-west reciprocal-tidal currents and influenced by the year-round westward mean flow modified by the wind-driven seasonal currents. Article History: Received 23 May 2014; Revised 1 July 2014; Accepted 4 July 2014
    Keywords: Tidal Currents -- Analysis ; Geologic Facies -- Analysis
    ISSN: 0025-3227
    Source: Cengage Learning, Inc.
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