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| The Concentration Variation of Chlorophyll-a in Artificial Shallow Lake During High Suspended Sediment Water Supplement |
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| KeyWord:Dongchang Lake; water supplement; suspended sediment; chlorophyll-a; synchronously monitoring |
| Author Name | Affiliation | | LUO Chuan-ting | College of Environmental Science and Engineering, Ocean University of China | | CHEN You-yuan | College of Environmental Science and Engineering, Ocean University of China
Key Laboratory of Marine Environment and Ecology（Ocean University of China）, Ministry of Education | | ZHANG Chao | College of Environmental Science and Engineering, Ocean University of China |
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| Abstract: |
| The water supplement from Yellow River to Dongchang Lake was conducted on April 23, 2012 to April 26, 2012. Sample collection, flow velocity and suspended sediment concentration monitoring were synchronously implemented at 1~12 monitoring sites in the whole lake and 5 monitoring sites（A~E） of the longitudinal profile from inlet to outlet, respectively. The variation of suspended sediment（SS） concentrations and chlorophyll-a concentrations were analyzed from the whole lake to the longitudinal profile. Average concentration of chlorophyll-a was 4.07 μg·L-1 before the water supplement and 7.74 μg·L-1 after the water supplement, among which the Yellow River water contributed 21.1%. Increase in chlorophyll-a concentration from big to small , velocities and SS concentrations obviously appeared the peak values in A, B, but C, D, E showed a decreasing trend in turn. Chlorophyll-a concentrations of the five monitoring sites presented highly significant negative correlation with SS concentrations by 0.81 within the process of water supplement, while only about 0.43 without water supplement. Besides, monitoring sites in the lake which SS contents dominated by fine particles, Chlorophyll-a concentrations had a large rate of increase, whereas SS dominated by coarse particles showed a small increase of chlorophyll-a concentrations. In summary, it can infer that high concentration of coarse particles of suspended sediment inhibited the increase of chlorophyll-a concentration. While, fine particles or colloidal particles of suspended sediment offered a chance to increase chlorophyll-a concentration. These effects only happened in the short-term of the replenishment. The results showed suspended sediment might be one of the main factors of water environment that affected the variation of chlorophyll-a concentrations under the water supplement period. |
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