3D inverse modelling of groundwater flow at a fractured site using a stochastic continuum model with multiple statistical populations |
| |
| Authors: | H J W M Hendricks Franssen J J Gómez-Hernández |
| |
| Institution: | (1) Department of Hydraulic and Environmental Engineering, Technical University of Valencia, C./ Camino de Vera s/n, 46071 Valencia, Spain, ES |
| |
| Abstract: | 3D groundwater flow at the fractured site of Asp? (Sweden) is simulated. The aim was to characterise the site as adequately
as possible and to provide measures on the uncertainty of the estimates. A stochastic continuum model is used to simulate
both groundwater flow in the major fracture planes and in the background. However, the positions of the major fracture planes
are deterministically incorporated in the model and the statistical distribution of the hydraulic conductivity is modelled
by the concept of multiple statistical populations; each fracture plane is an independent statistical population. Multiple
equally likely realisations are built that are conditioned to geological information on the positions of the major fracture
planes, hydraulic conductivity data, steady state head data and head responses to six different interference tests. The experimental
information could be reproduced closely. The results of the conditioning are analysed in terms of ensemble averaged average
fracture plane conductivities, the ensemble variance of average fracture plane conductivities and the statistical distribution
of the hydraulic conductivity in the fracture planes. These results are evaluated after each conditioning stage. It is found
that conditioning to hydraulic head data results in an increase of the hydraulic conductivity variance while the statistical
distribution of log hydraulic conductivity, initially Gaussian, becomes more skewed for many of the fracture planes in most
of the realisations. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
