Chunan Environmental Monitoring Station

Hangzhou, China

Chunan Environmental Monitoring Station

Hangzhou, China
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Sheng H.,Nanjing Forestry University | Sheng H.,Hangzhou Institute of Environmental Protection Science | Wu Z.,Chunan Environmental Monitoring Station | Liu M.,Hangzhou Institute of Environmental Protection Science | And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Based on the monthly water quality monitoring data and hydro-meteorological data from 2003 to 2012, this study analyzed water quality and nutritional status in Xin'anjiang reservoir and investigated the relationship between water quality change and hydro-meteorological factors. The results showed that the interannual variability of total phosphorus, total nitrogen, BOD and pH value were significant in the past 10 years in Xin'anjiang Reservoir. Chlorophyll a concentration increased in recent 10 years. Comprehensive nutrition state index showed that the reservoir trophic status was improved gradually from oligotrophic to mesotrophic. Nutrient and chlorophyll a was higher in riverine zone than transitional and lacustrine zone and in flooding season than dry season, which indicated that reservoir nutrients came mainly from non-point source pollution. The mean annual air temperature and water temperature decreased, while rainfall, out flow and in flow increased. The correlation analysis showed that hydro-meteorological factors had significant impacts on water quality index. ©, 2014, Science Press. All right reserved.


Dong C.-Y.,Zhejiang GongShang University | Yu Z.-M.,Hangzhou Institute of Environmental Protection Science | Wu Z.-X.,Chunan Environmental Monitoring Station | Wu C.-J.,Zhejiang GongShang University
Huanjing Kexue/Environmental Science | Year: 2013

Lake Qiandao is a typical subtropical man-made reservoir in China. The investigation on the seasonal and vertical dynamics of water temperature, dissolved oxygen (DO), pH value, turbidity, photosynthetic available radiation (PAR) and chlorophyll a was conducted in 2011 in order to find out the physical characteristics of Lake Qiandao. The average surface water temperature ranged from 10.4 to 32.7°C. A monomictic thermal stratification was observed in Lake Qiandao, initiating in April and lasting until December. The results showed that thermal stratification had influences on vertical distribution of DO, pH value, turbidity, PAR and chlorophyll a. Very strong stratification of DO was found, inducing lower oxygen concentration in the thermocline layer and temporal hypoxia in the bottom water. The maximum turbidity was found in the thermocline layer and the precipitation affected the surface turbidity value. Moreover, the chlorophyll a concentration was higher in the surface water and lower in the bottom water as found in this study, implying that water quality was affected by stratification. Besides, the maximum photosynthesis rate and algal growth rate were found at the depth 5-10 m below the water surface. Therefore, the results can provide theoretical support for the sampling and analysis of algal blooms in Lake Qiandao.


Yin Y.,Hangzhou Institute of Environmental Science | Wu Z.-X.,Chunan Environmental Monitoring Station | Liu M.-L.,Hangzhou Institute of Environmental Science | He J.-B.,Hangzhou Institute of Environmental Science | Yu Z.-M.,Hangzhou Institute of Environmental Science
Huanjing Kexue/Environmental Science | Year: 2014

Based on monthly in situ data collected at six sampling sites in Qiandaohu Lake between 2011 and 2012, the dynamic distributions of dissolved oxygen (DO) were analyzed and the relationships between DO and the environmental factors were investigated. The results showed that there were obviously vertical and temporal variations in the distributions of DO. In winter, the average values of DO were generally higher than those in other seasons, but no significant vertical distribution variation was found except Dabaqian. However, the vertical differences of DO in summer were larger than those in spring and autumn. Moreover, the maximum values of DO found in euphotic zone at the sites of Xiaojinshan, Santandao, Dabaqian in summer were 11.59, 12.52, 10.96 mg·L-1, respectively. The maximum DO at surface layer was found in spring while the minimum value appeared in autumn. Seasonal differences in relationships between dissolved oxygen and water temperature, pH, and Chla concentration were discussed. In summer, highly significant linear correlation between DO and water temperature was found indicating that the temperature thermal stratification was the key factor to influence the vertical distribution of DO. The relative higher correlation coefficients between DO and pH, Chla concentration in spring and summer were due to the phytoplankton photosynthesis.


Wu Z.,Chun'an Environmental Monitoring Station | Zhang Y.,CAS Nanjing Institute of Geography and Limnology | Zhou Y.,CAS Nanjing Institute of Geography and Limnology | Zhou Y.,University of Chinese Academy of Sciences | And 3 more authors.
International Journal of Environmental Research and Public Health | Year: 2015

Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xin’anjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin’anjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xin’anjiang Reservoir. © 2015 by the authors; licensee MDPI, Basel, Switzerland.


Zhang M.,Hangzhou Environmental Monitoring Central Station | Tang F.-L.,Hangzhou Environmental Monitoring Central Station | Wu Z.-X.,Chunan Environmental Monitoring Station | Chen F.,Hangzhou Environmental Monitoring Central Station | And 3 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

Polycyclic aromatic hydrocarbons (PAHs) were quantitatively determined by HPLC in several surface sediment samples collected in December 2012 from Xin'anjiang Reservoir. The results showed that 15 of the 16 US EPA priority controlled PAHs were detected. Total concentrations of PAHs in surface sediments of the studied reservoir ranged from 258 to 906 ng/g dry weight (dw), with average 558 ng/g dw, lower pollution level. The distribution of PAHs is found to be influenced by riverine discharge and point-source pollution. The PAHs in the sediments were dominated by high molecular weight PAHs. According to the ratio of feature components, the PAHs in surface sediment from the Xin'anjiang Reservoir originated largely from coal and biomass incomplete combustion in the surrounding areas and exhaustion of boats or cars. In addition, the ecological risk of surface sediment in Xin'anjiang Reservoir was assessed with the methods of sediment quality guidelines and sediment quality standards (SQSs), and the result indicated that there was no great biological impact associated with the PAHs in the surface sediment of Xin'anjiang Reservoir. However, the concentrations of some points have been exceeded the threshold effect level evaluated in accordance with SQSs. It is necessary to identify the contamination source and control the pollution input.


Tang F.-L.,Hangzhou Environmental Monitoring Central Station | Zhang M.,Hangzhou Environmental Monitoring Central Station | Xu J.-F.,Hangzhou Environmental Monitoring Central Station | Ruan D.-D.,Hangzhou Environmental Monitoring Central Station | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

Organochlorine pesticides (OCPs) were quantitatively determined by GC in several surface water samples collected in July 2011 and November 2011 from Lake Qiandao (Xin'an River Reservoir) and its major input rivers. Then the component characteristics and source apportionment of HCHs and DDTs were confirmed, and the health risk assessment was evaluated. The results showed that 8 OCPs were found to be in trace amount, and p,p'-DDT, α-HCH and p,p'-DDE were the highest frequently detected OCPs. The concentrations of total OCPs in surface water of the studied Lake ranged from 1.9 to 7.6 ng·L-1, which were at lower pollution level, and 1.2-212 ng·L-1 in the samples from its three major input rivers. The spatial distribution of OCPs in the water of lake was varying, and Xin'an River, the mainstream of the lake, was the main input source of OCPs. Also, different contamination patterns among sampling seasons were found, the concentrations of OCPs in surface water collected in wet period were higher than those in dry season, which display the characteristics of nonpoint source pollution. According to the ratio of feature components, the OCPs in surface water from the Lake Qiandao originated largely from long distance transmission or degradation of technical HCHs, while additional sources of DDTs existed in the region. In addition, human health risk assessment of ingestion through the drinking water and skin contact absorption was performed using EPA recommends methods, the carcinogenic and non-carcinogenic risks caused by OCPs were 0.06×10-7-23.2×10-7 and 3.43×10-5-6.01×10-3, respectively. According to the acceptable risk level, the carcinogenic and non-carcinogenic risks of the chemicals investigated can be considered negligible in water body of Lake Qiandao.


Zhang Y.,CAS Nanjing Institute of Geography and Limnology | Wu Z.,Chunan Environmental Monitoring Station | Liu M.,Institute of Environmental Protection Science | He J.,Institute of Environmental Protection Science | And 3 more authors.
Limnology and Oceanography | Year: 2014

Using the vertical temperature profiles of Lake Qiandaohu from January 2010 to April 2013, we evaluated the monthly and seasonal variations of water temperature and thermocline parameters, and developed empirical models among thermocline depth (TD), thickness (TT), and strength (TS). We also developed empirical models between TD, TT, TS, and surface-water temperature (0-2 m) (T0-2 m), and transparency (Secchi disk depth, SDD). Additionally, we assessed the changes in TD, TT, and TS over the past 62 yr, based on our empirical models, air temperature data from 1951 to 2012, and SDD data from 1987 to 2012. Lake Qiandaohu is warm monomictic, with a long period of thermal stratification from April until January, and only a short period of mixing in the winter or spring (February or March). There were significant correlations between SDD and TD (positive), and between SDD and TT (negative). There was a significant negative correlation between T0-2 m and TD during the stratification weakness period (July-February), and a significant positive correlation between T0-2 m and TT for all data, including the stratification formation and weakness periods. Air temperature near the lake rose 1.2°C between 1951 and 2012, corresponding to a 0.8°C increase in T0-2 m, and a 0.78 m decrease in SDD between 1987 and 2012. The increase in air temperature and the decrease in SDD caused a decrease in TD and an increase in TT, facilitating the thermal stratification and stability of the lake; therefore, climate warming has had a significant effect on the thermal regime of Lake Qiandaohu. © 2014, by the Association for the Sciences of Limnology and Oceanography, Inc.


Zhang Y.,CAS Nanjing Institute of Geography and Limnology | Wu Z.,Chunan Environmental Monitoring Station | Liu M.,Institute of Environmental Protection Science | He J.,Institute of Environmental Protection Science | And 7 more authors.
Water Research | Year: 2015

From January 2010 to March 2014, detailed depth profiles of water temperature, dissolved oxygen (DO), and chromophoric dissolved organic matter (CDOM) were collected at three sites in Lake Qiandaohu, a large, deep subtropical reservoir in China. Additionally, we assessed the changes in DO stratification over the past 61 years (1953-2013) based on our empirical models and long-term air temperature and transparency data. The DO concentration never fell below 2mg/L, the critical value for anoxia, and the DO depth profiles were closely linked to the water temperature depth profiles. In the stable stratification period in summer and autumn, the significant increase in CDOM in the metalimnion explained the decrease in DO due to the oxygen consumed by CDOM. Well-developed oxygen stratification was detected at the three sites in spring, summer and autumn and was associated with thermal stratification. Oxycline depth was significantly negatively correlated with daily air temperature and thermocline thickness but significantly positively correlated with thermocline depth during the stratification weakness period (July-February). However, there were no significant correlations among these parameters during the stratification formation period (March-June). The increase of 1.67°C in yearly average daily air temperature between 1980 and 2013 and the decrease of 0.78m in Secchi disk depth caused a decrease of 1.65m and 2.78m in oxycline depth, respectively, facilitating oxygen stratification and decreasing water quality. Therefore, climate warming has had a substantial effect on water quality through changing the DO regime in Lake Qiandaohu. © 2015 Elsevier Ltd.


PubMed | Chunan Environmental Monitoring Station, CAS Nanjing Institute of Geography and Limnology and Institute of Environmental Protection Science
Type: Journal Article | Journal: International journal of environmental research and public health | Year: 2015

Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xinanjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xinanjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xinanjiang Reservoir.


PubMed | Chunan Environmental Monitoring Station, CAS Nanjing Institute of Geography and Limnology and Institute of Environmental Protection Science
Type: | Journal: Water research | Year: 2015

From January 2010 to March 2014, detailed depth profiles of water temperature, dissolved oxygen (DO), and chromophoric dissolved organic matter (CDOM) were collected at three sites in Lake Qiandaohu, a large, deep subtropical reservoir in China. Additionally, we assessed the changes in DO stratification over the past 61 years (1953-2013) based on our empirical models and long-term air temperature and transparency data. The DO concentration never fell below 2 mg/L, the critical value for anoxia, and the DO depth profiles were closely linked to the water temperature depth profiles. In the stable stratification period in summer and autumn, the significant increase in CDOM in the metalimnion explained the decrease in DO due to the oxygen consumed by CDOM. Well-developed oxygen stratification was detected at the three sites in spring, summer and autumn and was associated with thermal stratification. Oxycline depth was significantly negatively correlated with daily air temperature and thermocline thickness but significantly positively correlated with thermocline depth during the stratification weakness period (July-February). However, there were no significant correlations among these parameters during the stratification formation period (March-June). The increase of 1.67 C in yearly average daily air temperature between 1980 and 2013 and the decrease of 0.78 m in Secchi disk depth caused a decrease of 1.65 m and 2.78 m in oxycline depth, respectively, facilitating oxygen stratification and decreasing water quality. Therefore, climate warming has had a substantial effect on water quality through changing the DO regime in Lake Qiandaohu.

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