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| Time-lag responses of turbidity to wind values in Meiliang Bay, Taihu Lake |
| QU Shan, WANG Jian-jian, YUAN Yuan |
| Key Laboratory of Hydrometeorological Disaster Mechanismand Warning of Ministry of Water Resources, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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Abstract The wind values from the field high-frequency simultaneous observations were used to quantitatively characterize the wind direction and wind speed variations, and the generalized summation model (GAM) was used to evaluate the hysteresis effects of individual wind speeds and integrated wind values on surface and bottom turbidity of the Taihu Lake. The results show that: (1) the turbidity in the area of Meiliang Bay in the Taihu Lake was low under light wind conditions (wind speed < 4m/s or wind value < 3), and increased continuously with wind speed. With an increase in wind value, the turbidity showed an increasing trend in the early stage and a flat trend in the later stage; (2) the short-term change in wind direction had a small effect on the turbidity, while the long-term accumulation of one-way wind had a large effect; (3) the lag time of surface turbidity was 5h 45min to wind speed alone, and 1h to wind value, and the lag time of bottom turbidity to wind speed and wind value was 7h and 2h, respectively. Obviously, there was a specific time-lagged responses of turbidity to both wind speed and wind direction, becoming obvious with water depth. Due to the influence of other factors (e.g., topography, etc.), the lake flow had a certain vertical shear, and the influence of wind direction on turbidity variation gradually became weak. Obviously, the dual effects of wind direction and the hysteresis effect determine the accuracy of the eutrophication model, and the studies on wind speed's effects on shallow lakes' ecosystems need to be further enhanced with no ignorance of the effects of wind direction.
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Received: 12 October 2022
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