摘要
弥散系数是评价一条河流对突发性污染的承载能力的重要指标,径流流速和地下河管道结构是重要的水文地质条件要素。以荧光素纳和罗丹明B为示踪剂在寨底地下河进行示踪实验,用GGUN野外用荧光光度仪自动检测。根据实验所得数据,绘制穿透BTC曲线。通过对溶解运移方程进行拉布拉斯(Laplace)或傅里叶(Fourier)转换使之成为矩分析方程,用矩分析的方法得出弥散系数为0.83～0.91 m2/s,平均流速为142.2～150.3 m/d。试验中,在监测点的回收率为78.8%～91.0%,初步推测地下河管道无其他排泄支流。根据BTC曲线拖尾很长,推测存在地下湖。
Dispersion coefficient is an important parameter to evaluate rivers＇ degradation ability to accidental pollution. As runoff velocity and structure of the underground river are the important elements of hydrogeology, the paper takes a tracer test of uranine and rhodamine b in Zhaidi subterranean river, then monitors the motion trial by fluorescence speetrophotometer GGUN - FL30, and draws BTC curve according to the monitoring data. Then solute transport equations are converted into mo- ment analysis equations according to Laplace or Fourier conversion principle. The result of moment analysis shows that the dis- persion coefficient of the studied subterranean river is between 0. 83 mE/s to 0. 91 m2/s, average flow velocity is from 142.2 m/d to 150.3 m/d and the tracer recover is around 78.8% to 91% , which means no other branches in the subterranean riv- er. Moreover, long tail in BTC curve indicates the existence of underground lake.
出处
《地下水》
2013年第4期13-15,共3页
Ground water
基金
国家自然科学基金<西南岩溶地下河中石油烃BTEX污染物的归宿与迁移机理研究>(编号:41172229)
关键词
示踪实验
矩分析
地下河
弥散系数
Tracer test
moment analysis
subterranean river and dispersion coefficient
