河流曲度对水体中磷去除影响的试验研究
作 者：
陈睿东;陈菁;肖晨光;金秋;樊荣;陈炼钢
关键词：
河流曲度;总磷去除;上覆水;孔隙水;潜流交换
摘 要：
降低总磷浓度已成为我国河流污染治理的重要部分.为揭示河流曲度对水体中磷去除影响的机制,通过4组不同河流曲度的循环水试验,对比研究磷素在上覆水、河岸孔隙水中随时间变化的迁移转化特性.结果显示:上覆水总磷浓度下降过程可分为快、慢2个阶段,在快下降阶段,高曲度河流上覆水总磷浓度下降速率显著大于低曲度河流,上覆水总磷浓度去除效率随曲度增大而提高;受纵向潜流交换和横向扩散影响,弯曲河流河岸各点孔隙水总磷浓度存在差异(1号>2号; 3号>4号; 5号>6号);受横向扩散影响,顺直河流孔隙水总磷浓度沿远离河道的方向减小;上覆水磷去除效率受纵向潜流交换影响显著,受横向扩散影响小.
作 者：
CHEN Rui-dong;CHEN Jing;XIAO Chen-guang;JIN Qiu;FAN Rong;CHEN Lian-gang;College of Agricultural Engineering,Hohai University;Nanjing Hydraulic Research Institute;
单 位：
CHEN Rui-dong%CHEN Jing%XIAO Chen-guang%JIN Qiu%FAN Rong%CHEN Lian-gang%College of Agricultural Engineering,Hohai University%Nanjing Hydraulic Research Institute
关键词：
river sinuosity;;reducing the total phosphorus;;overlying water;;pore water;;hyporheic exchange
摘 要：
Reducing the total phosphorus( TP) concentration has become an important part of river pollution control in China. In order to reveal the mechanism of the influence of river sinuosity on phosphorus( P) removal in water,four groups of circulating water tests with different river sinuosity were conducted to compare and study the migration and transformation characteristics of phosphorus in overlying water and pore water along river banks over time. The results show that: The decrease process of total phosphorus concentration in overlying water can be divided into two stages: fast and slow. In the fast descending stage,the decreasing rate of total phosphorus concentration in the overlying water of the high-sinuosity river is significantly higher than that of the low-sinuosity river. The removal efficiency of total phosphorus in overlying water increases with the increase of sinuosity. Due to the influence of longitudinal hyporheic exchange and lateral diffusion,the total phosphorus concentration in pore water at each point on the banks of curved rivers is different( 1# > 2#; 3 # > 4 #; 5# >6#); under the influence of lateral diffusion,the total phosphorus concentration in the pore water decreases along the direction away from the channel. The removal efficiency of phosphorus in overlying water is significantly affected by the longitudinal hyporheic exchange but not by the transverse diffusion.
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