摘要
为对比研究农田地表控制和非控制排水条件下,不同时段暴雨产生地表径流中磷质量浓度和总排水量的变化规律,进行平均降雨强度为0.49 mm/min、历时126 min的降雨排水试验。试验结果表明:非控制排水各时段平均磷排出质量浓度为8.48 mg/L,控制排水平均磷排出质量浓度为4.4 mg/L;控制排水量比非控制排水量减少了13.5%;非控制排水磷排出量为271.6 mg/m2,控制排水磷排出量为136.5 mg/m2。控制排水总排水量的减少和排水中磷质量浓度的降低,使得控制排水磷排出量仅为非控制排水的50.3%。农田地表控制排水显著减少了磷的排出量。
To find out the regularities of the variation of phosphor concentration in surface runoff caused by heavy rains with the total volume of drain discharge under the controlled drainage and non-controlled drainage for different periods, drainage experiments under rainfall lasting 126 minutes with an averaged intensity of 0.49 mm/min were performed. The results show that the averaged concentration of phosphor discharge for each duration under non-controlled drainage is 8.48 mg/L while the averaged concentration of phosphor discharge is 4.4 mg/L under controlled drainage; the volume of drain discharge under controlled drainage is 13.5 % less than that under non-controlled drainage; the amount of phosphor discharge under non-controlled drainage is 271.6 mg/m^2 while it is only 136.5 mg/m^2 under controlled drainage. Because controlled drainage decreases the total volume of drain discharge and also the phosphor concentration in the drain discharge, the phosphor discharge under controlled drainage is only 50.3 % of that under non-controlled drainage. Therefore the controlled drainage evidently decreases the amount of phosphor discharge.
出处
《水利水电科技进展》
CSCD
北大核心
2006年第4期24-26,39,共4页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金资助项目(50309003)
河海大学科技创新基金重点资助项目(2084/405002)
关键词
地表控制排水
磷质量浓度
排水量
面源污染
controlled discharge from field surface
phosphor concentration
volume of drain discharge
non-point pollution
