Abstract
Investigating and modeling fluid flow in fractured aquifers is a challenge. This study presents the results of a series of packer tests conducted in a fractured aquifer in Freiberg, Germany, where gneiss is the dominant rock type. Two methods were applied to acquire hydraulic properties from the packer tests: analytical and numerical modeling. MLU (Multi-Layer Unsteady state) for Windows is the analytical model that was applied. ANSYS-FLOTRAN was used to build a two-dimensional numerical model of the geometry of the layered aquifer. A reasonable match between experimental data and simulated data was achieved with the 2D numerical model while the solution from the analytical model revealed significant deviations with respect to direction.
Highlights
Fractured aquifers are very important for groundwater supply because about 75% of the earth’s surface consists of fractured aquifers [1] and 25% of the global population is supplied by karst waters [2]
This study presents the results of a series of packer tests conducted in a fractured aquifer in Freiberg, Germany, where gneiss is the dominant rock type
Gernand and Heidtman [12] used the analytical model by Jenkins and Prentice to analyze a pumping test in a fractured gneiss aquifer
Summary
Fractured aquifers are very important for groundwater supply because about 75% of the earth’s surface consists of fractured aquifers [1] and 25% of the global population is supplied by karst waters [2]. Flow velocity in fractured gneiss is known to be highly variable over a range of scales and uncertainties which arises from heterogeneous flow pattern in fissures and fractures. This has significant implications on water resource management from borehole to catchment scales. Wang and Cui [14] analyzed fluid flow and heat transfer by using the distributed resistance application in ANSYS FLOTRAN. Their analysis was done without comparing the modeled results with those from experiments (Gu et al [15] and Cen and Chi [16]). Crandall et al [19] used ANSYS FLUENT to obtain the flow solution in a fractured aquifer
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