基于示踪剂质量守恒的测流模型研究

Study on Model of Measuring Seepage Velocity Basing on Tracer Mass Conservation

地下水渗透流速是一个很重要的水文地质参数,示踪技术可较为准确地估算地下水渗透流速。针对前人计算公式受诸多条件限制或存在不足之处,根据示踪剂质量守恒原理重新建立了示踪稀释物理模型,利用微元法推导了含水层水平流速计算新公式,修正了广义稀释定理,讨论了新公式与传统公式的内在联系,给出了实测数据的处理方法。应用于工程实例,表明采用新公式能够得到更为丰富的含水层水平流速变化信息,并与地质条件相一致,计算结果更为可靠的。

Seepage velocity of groundwater is a very important hydrogeological parameter of aquifer which can be estimated by tracer technique. There exist shortcomings or restricted conditions in preceding formulae of obtaining the seepage velocity. A tracer dilution physical model of measuring seepage velocity was reestablished according to tracer mass conservation, and a new formula of calculating the horizontal seepage velocity was given by infinitesimal method which modified the generalized dilution formula. Then, the internal relationship between the traditional formula and the new one was discussed. A method to deal with the practical data was given combining with an engineering case. The result indicated that the new formula could get more abundant information of the horizontal seepage velocity in the aquifer, which was much close to the local geological condition and more reliable.