利用逆统计模型确定秦岭特长隧道地下水年龄

针对基岩裂隙介质中地下水流普遍存在的水动力弥散作用及地下水年龄的同位素数学模型复杂的状况,作者介绍一种计算地下水年龄的逆统计模型(ISM).该模型不仅因考虑了上述影响因素使其理论上更完善,而且使地下水年龄计算较之传统的同位素指数活塞模型(EPM)更为简便.利用ISM模型,计算出秦岭特长隧道地区地下水年龄的下限约55 a,与EPM模型计算结果基本吻合.该模型可作为裂隙介质中地下水年龄计算的一种基本方法.

Use of inverse statistical model to estimate the groundwater age in Qinling extra-long tunnel

The inverse statistical model(ISM) for groundwater age is introduced in the paper on the basis of the status that hydrodynamic dispersion of groundwater occurs commonly in fractured bedrock mediums and the isotopic mathematical model is quite complicated for groundwater age. The ISM is not only (relatively) perfect in theory because of the above-mentioned influential factors involved, but it also makes the calculation of groundwater age simple compared with the traditional isotope exponent-piston model(EPM). The down limit of deeper groundwater age in the Qinling extra-long tunnel area is estimated by the ISM at about 55 years, coinciding principally with the result calculated by the EPM. The model can serve as an essential approach to determine groundwater age in fractured bedrock mediums.