受潮汐影响的半封闭水体活水工程设计与运行
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摘要
东坡湖是受潮汐影响的半封闭水体,水面面积大,水动力条件差,水体停留时间长,为藻类繁殖创造了有利的水文条件,富营养化特征明显。结合海甸岛自然水系和东坡湖特点,在东坡湖设置活水泵站和节制闸,通过扩大涵口尺寸,并利用闸泵联合调度,增大了纳潮量,水流向由往复流调整为单向流,水体停留时间由22. 3 d减少到13. 4 d,改善了东坡湖的水动力条件。活水工程实施后,东坡湖的水质稳定达到《地表水环境质量标准》(GB 3838—2002)Ⅴ类标准,有效改善了水质和感官指标。
Dongpo Lake is a semi-closed water with tidal influence. It has large water surface area,poor hydrodynamic condition and long retention time, which creates favorable hydrological conditions for algal bloom and leads to eutrophication. Combing the characteristics of natural water system of Haidian Island and Dongpo Lake,a pumping station and a sluice were set up in Dongpo Lake. By expanding the culvert size and using joint scheduling of sluice & pumping station,the tidal influx was increased,the water flow direction was adjusted from reciprocating flow to undirectional flow,and the retention time was reduced from 22. 3 days to 13. 4 days,which effectively improved the hydrodynamic conditions of Dongpo Lake. After implementation of the water flowing scheme,the water quality had consistently met level V criteria of Environmental Quality Standards for Surface Water (GB 3838-2002),which effectively improved water quality and sensory indicators.
Dongpo Lake is a semi-closed water with tidal influence. It has large water surface area,poor hydrodynamic condition and long retention time, which creates favorable hydrological conditions for algal bloom and leads to eutrophication. Combing the characteristics of natural water system of Haidian Island and Dongpo Lake,a pumping station and a sluice were set up in Dongpo Lake. By expanding the culvert size and using joint scheduling of sluice & pumping station,the tidal influx was increased,the water flow direction was adjusted from reciprocating flow to undirectional flow,and the retention time was reduced from 22. 3 days to 13. 4 days,which effectively improved the hydrodynamic conditions of Dongpo Lake. After implementation of the water flowing scheme,the water quality had consistently met level V criteria of Environmental Quality Standards for Surface Water (GB 3838-2002),which effectively improved water quality and sensory indicators.
引文
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[4]胡和平，文坛花，郝永怀，等．受潮汐影响的断头河道活水工程的设计与运行[J]．中国给水排水，2019,35(2):49-52.Hu Heping,Wen Tanhua,Hao Yonghuai,et al.Design and operation of water flowing project of the truncated river with tidal influence[J].China Water&Wastewater,2019,35(2):49-52(in Chinese).
[2]Kawara O,Yura E,Fujii S,et al.A study on the role of hydraulic retention time in eutrophication of the Asahi River Dam reservoir[J].Water Sci Technol,1998,37(2):245-252．
[3]Jones I D,Elliott J A.Modelling the efects of changing retention time on abundance and composition of phytoplankton species in a small lake[J].Freshwater Biol,2007,52(6):988-997．
[4]胡和平，文坛花，郝永怀，等．受潮汐影响的断头河道活水工程的设计与运行[J]．中国给水排水，2019,35(2):49-52.Hu Heping,Wen Tanhua,Hao Yonghuai,et al.Design and operation of water flowing project of the truncated river with tidal influence[J].China Water&Wastewater,2019,35(2):49-52(in Chinese).