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指示点法是一种介于传统分区反演和复杂的单元格参数反演的中间方法。传统分区反演将模型区分为若干个分区,需要反演的参数少,但分布通常过于简单;复杂的逐单元格反演方法理论上能得到最接近实际的参数分布,但通常运算量极大,并且需要大量的调查数据对模拟区进行地质统计。指示点法采用在不同区域内添加特征点进行参数估值的方法,保证各地质单元内参数的非均质性和特异性,利用克里格插值法将结果分配到模型域内,减少了对模拟区地质统计资料的要求,弥补了两者之间的差距。该方法较传统方法拥有节约计算时间、提高拟合度、减少由参数数量引起数值模型的不稳定性等优点。本文简单介绍了指示点法,并将其应用在一个地层结构非均质性显著,场地水力学参数不明的案例中。在案例中,首先根据地形地貌单元分布以及野外调查资料划分水文地质单元分区,通过拟合研究区水位,进行分区反演,初步获得渗透系数的简单分布,在分区反演的基础上,添加指示点及扰动值范围,进一步进行指示点反演,最终获得了比简单分区反演更好的水位拟合结果,渗透系数场分布也更接近实际。
The pointing-point method is an intermediate method between traditional zonal inversion and complex inversion of cell parameters. The traditional zoning inversion divides the model into several zoning and needs fewer parameters to be inverted, but the distribution is usually too simple. The complex inverse inversion method theoretically can get the closest actual parameter distribution, but it usually takes a lot of computation , And requires a large amount of survey data to conduct geological statistics on the simulated area. The indicator point method adopts the method of parameter estimation by adding the feature points in different regions to ensure the heterogeneity and specificity of the parameters in the geological units. The result is distributed to the model domain by using the Kriging interpolation method, thereby reducing the influence on the simulation The requirements for geological statistics in the district make up the difference between the two. Compared with the traditional method, this method has the advantages of saving calculation time, improving the fitting degree and reducing the instability of the numerical model caused by the number of parameters. In this paper, we briefly introduce the indicator point method and apply it in a case where the stratum structural heterogeneity is significant and the site hydraulics parameters are unknown. In the case, the division of hydrogeological units is first divided into units according to the distribution of topography and geomorphology and the field survey data. By fitting the water level in the study area and carrying out zonal inversion, preliminary distribution of permeability coefficient is obtained preliminarily. On the basis of zoning inversion, Point and perturbation value range, the inversion of the indicator point is further carried out. Finally, a better fitting result of the water level than the simple zoning inversion is obtained, and the distribution of the permeability coefficient field is also closer to reality.