摘要
为充分利用补水改善水体富营养状况,并预测补水对水体水质的改善效果,以重庆主城重污染河流伏牛溪生态补水工程为例,基于平面二维模型MIKE21,针对不同补水点位置、数量和水量分配方案对水体水质和水动力改善效果进行数值模拟。结果表明:采用单点补水方式,占水库总面积78.2%的水体达到地表V类水质标准,但滞留区水质无法达标;采用两点补水方式,在最优水量分配方案下,占水库总面积90.1%的水体达到地表Ⅴ类水质标准;采用三点补水方式,水库中水质改善速度较快,但在最优水量分配方案下,只有占水库总面积76.4%的水体达到地表Ⅴ类水质标准。结合达标水体面积、水质改善速度和工程经济性等因素综合考虑,确定12000m^(3)/d和3000m^(3)/d分配补水点水量的两点补水方式,为伏牛溪生态补水工程实施时的优化配置方式。
In order to make full use of hydrodynamic force produced by water replenishment to mitigate eutrophication and predict the effect of water quality improvement,taking the ecological water replenishment project of heavily polluted Funiu Creek in Chongqing as an example,this study simulated the effect of hydrodynamic and water quality improvement applying two-dimensional MIKE21 model.The location,quantity and flow distribution of different water replenishment points were considered.It is found that,when one point is adopted,78.2% of the study area reaches the standard of class Ⅴ water quality.However,the water quality in the stagnant area cannot;When two points and the optimal water allocation scheme are adopted,the area reaching the standard increases to 90.1%;When three points are adopted,the water quality in the reservoir improved faster,but only 76.4% of it meets the requirement even with the optimal water allocation scheme.Taking into account the area size reaching standard,water quality improvement speed,engineering economy and so on,the two-point water replenishment method,in which water quantity at the replenishment point is respectively 12000 m^(3)/d and 3000 m^(3)/d,is the optimal allocation method for the implementation of Funiu Creek ecological replenishment project.
作者
王菲菲
卿晓霞
俞思嘉
WANG Feifei;QING Xiaoxia;YU Sijia(College of Environment and Ecology,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《水文》
CSCD
北大核心
2021年第5期48-52,90,共6页
Journal of China Hydrology
基金
山地城市面源污染控制和雨洪管理技术研究与示范(2017YFC0404704)
重庆海绵城市建设与运维技术研究与示范(cstc2018jszx-zdyfxmX0010)。
关键词
数值模拟
MIKE21
生态补水
城市河流
补水工程配置方式
numerical simulation
MIKE21
ecological water replenishment
urban river
water replenishment project allocation method
作者简介
王菲菲(1996-),女,河南郑州人,硕士研究生,主要研究方向为海绵城市。E-mail:Wangff1088@126.com;通信作者:卿晓霞(1963-),女,重庆人,博士、教授、博导,主要研究方向为海绵城市和水污染自动控制。E-mail:qxx118@126.com。
