摘要
本文以时域反射仪 (TimeDomainReflectometry ,TDR)作为溶质锋的探测手段 ,对利用边界层方法确定的参数和利用穿透曲线拟合法确定的参数进行了比较 ,结果表明边界层方法确定的扩散弥散系数 (D)与穿透曲线拟合法确定的扩散弥散系数基本相近 .但 ,因为TDR灵敏度的限制 ,边界层方法确定的延迟因子 (R)大于穿透曲线拟合法确定的延迟因子 .应用边界层方法确定的参数 ,比较了用边界层方法和精确方法预测的浓度剖面图 ,表明边界层方法在一定时间内可以精确地预测污染物的动态浓度分布 .实验结果不仅说明了TDR作为溶质锋探测手段的可行性 。
The movement of solute front in soil is detected by means of time domain reflectometry(TDR).The comparison of the parameters obtained from boundary layer theory method(BLTM) and break\|through curve fitting shows that the former method is better than the later.But the value of retardation factor R determined by BLTM is greater than that from break\|through curve fitting,due to the sensitivity limitation of TDR.A lag deviation of the solute front judged by TDR is always occurred.The solution profiles calculated with the BLTM and the analytical solution using the parameters identified by BLTM prove that the dynamic distribution of pollutants can be accurately forecasted by BLTM in a certain time.
出处
《水利学报》
EI
CSCD
北大核心
2002年第1期92-96,共5页
Journal of Hydraulic Engineering
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 186 0 5 )
国家自然科学基金资助项目 ( 5 98792 0 6 )
