Spatial and temporal variations of suspended solid concentrations from 2000 to 2013 in Poyang Lake,China |
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| Authors: | Juanle Wang Eryang Chen Ge Li Lu Zhang Xiaoming Cao Yongjie Zhang Yujie Wang |
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| Institution: | 1.State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,China;2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing,China;3.Anhui Huadian Engineering Consulting & Design Co., Ltd.,Hefei,China;4.School of Civil and Architectural Engineering,Shandong University of Technology,Zibo,China;5.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography & Limnology,Chinese Academy of Sciences,Nanjing,China;6.Institute of Desertification Studies,Chinese Academy of Forestry,Beijing,China |
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| Abstract: | Concentrations of suspended solids in lakes can affect the latter’s primary productivity and reflect changes in sediment deposition. Determining the temporal and spatial distribution of suspended solid concentrations has important significance in lake water environmental management; this is particularly urgent for Poyang Lake, the largest freshwater lake in China. In this study, suspended solid concentration inversion models for Poyang Lake were created using a semi-empirical method with regression analysis between continuously measured suspended solid concentration data and multi-band moderate-resolution imaging spectroradiometer images for spring, summer, autumn, and winter from 2009 to 2012. The coefficient of determination (R2) is from 0.6 to 0.9 and the average relative error for the accuracy verification was between 10 and 30%. The seasonal distributions of suspended solid concentrations in Poyang Lake from 2000 to 2013 were then obtained using optimal reversal models. The results showed that the seasonal variation in suspended solid concentrations had a “W” shape in which high spring and autumn and low summer and winter values. The suspended solid concentrations increased annually from 2000 to 2013 and were mainly distributed in the northern and central portions of the lake, with lower values along the shorelines. Further analysis indicated that the large difference in water level between the wet and dry seasons is an important factor in explaining these seasonal variations. Moreover, the suspended solid concentrations were poorly correlated with water temperature and chlorophyll-a concentration but more highly correlated with the deferred chlorophyll-a concentration. |
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