Abstract Understanding fluid flow through a rough‐walled fracture is important in many problems such as petroleum and geothermal reservoir exploitation, geological storage of CO 2 , sitting radioactive waste repositories. In order to advance the understanding flow, we conducted first direct measurement velocity across fractures at Reynolds number ( Re ) 0.014 0.086. The results were used for an magnitude analysis evaluate assumptions underlying Stokes equations, which are derived from...

Abstract Causal mechanisms for fluid injection-induced earthquakes remain a challenge to identify. Past studies largely established spatiotemporal correlations. Here, we propose multi-process causal mechanism through case study of the 2017 M w 5.5 induced earthquake near Pohang Enhanced Geothermal System, Korea, where detailed hydraulic stimulation and on-site seismicity monitoring data provide an unprecedented opportunity. Pore pressure modeling reveals that pore changes initiate on...

Abstract Understanding fluid flow and solute transport in rough‐walled fractures is important many problems such as geological storage of CO 2 siting radioactive waste repositories. The first microscopic observation through a fracture was made to assess the evolution eddies their effect on non‐Fickian tailing. A noteworthy phenomenon observed that eddy grew, particles were initially caught swirled around within eddies, then cast back into main channel, which reduced This differs from...

Abstract This study made the first experimental attempt to visualize transition processes from linear nonlinear flow regimes in rough‐walled rock fractures for a better understanding of evolution fractures. The experiments visualized narrowing mainstream channel associated with eddies enlarged near fracture wall increasing applied flux. measured fluid velocity field showed that these structures resulted significant increase narrowed main and relatively small eddy zone. order‐of‐magnitude...

Experiments were carried out to investigate the influence of groundwater flow regime on dense nonaqueous phase liquid (DNAPL) migration in a rough‐walled fracture. Hydraulic and DNAPL experiments performed at Reynolds numbers ranging from 0 60.8. Nonlinear occurred fracture number approximately 10. Different paths taken by observed between linear nonlinear regimes. quantitatively analyzed using modified invasion percolation (MIP) model, which was found be attributed inertial force flowing...

Abstract This study investigates the impact of transition from viscous linear to inertial nonlinear flows on solute mixing and partitioning at rough‐walled fracture intersections, using direct observations flow dynamics processes through microscopic particle image velocimetry. It is generally known that intersections decreases when transport shifts diffusion‐dominated advection‐dominated processes, but this trend holds only in flows. The experimental results conducted reveal flows,...

ABSTRACT The difficulty in experimentally visualising solute transport leads to theoretical and numerical studies of rock fractures. This study presents the comprehensive experimental method for investigating microscopic processes rough‐walled fractures, including setup micro‐PIV system combined with time‐lapse imaging, visualisation a detailed calibration process convert fluorescence intensity into concentration analysis. transition dispersion regime from macrodispersion Taylor increasing...

The effects of various wetting conditions and aperture sizes on water flow slip in a parallel‐walled fracture were investigated. Water experiments showed that larger occurred as the surface became more hydrophobic. For creosote‐wetted with an 508 μ m, increase rate due to was much 10.0% compared water‐wetted surface. Similarly surface, no took place at gasoline‐wetted which weakly lengths, notional distance from wall point inside where fluid velocity extrapolates zero, for light oil‐...

Abstract A better understanding of solute transport and retention mechanism in rock fractures has been challenging due to difficulty their direct observations microscale rough‐walled fractures. Six representative troughs a fracture were selected for eddy formation with increasing flow velocity its effect on spatiotemporal changes concentration. This experimental study was enabled by visualization technique micro particle image velocimetry. With (Re ≤ 2.86), no eddies generated, solutes along...

This study aims at investigating the relationship between ratio of dispersion coefficient to molecular diffusion ( D L /D m ) and Peclet number Pe for a multi‐solute system in non‐Darcian flow regimes. Existing understanding on solute is primarily derived from Darcian regime with one solute. We find that rock fractures can be characterized by mechanism both macrodispersion Taylor dispersion, domains. For regime, different solutes lead same ‐ relationship. However, as becomes non‐Darcian,...

Analytical solutions have been suggested to delineate the capture zone created by multiwells for remediation design of contaminated groundwater. These previous analytical are often restricted pumping wells only, specific well locations, a limited number wells, and isotropic aquifer. An alternative steady state solution was deal with arbitrarily located multiinjection‐pumping in an anisotropic homogeneous The can be easily conveniently calculating hydraulic head gradient complex flow field...

We consider the influence of ambient groundwater flow on migration DNAPL within a fracture network. In context modified invasion percolation (MIP) growth algorithm, we formulate mechanistic model that includes capillary and gravity forces as well viscous groundwater. The MIP is verified against laboratory experiments, which show good agreement in path through two‐dimensional results both simulations experiments suggest can be significant factor controlling path, velocity, channeling pattern

Three kinds of experiments were conducted to test existing methods and develop an effective methodology for the remediation DNAPL trapped in vertical dead‐end fractures. A water‐flushing method failed remove TCE from fractures where no fluid flow occurs. experiment implies that methods, utilizing water‐based remedial such as surfactant‐enhanced method, have difficulty removing downward fractures, because water through capillary, gravity forces. Fluid denser than was injected into fracture...

Abstract In this study, the derivative analysis using of drawdown with respect to log‐time was utilized determine candidates for hydraulic conductor domains ( HCDs ). At a 500‐m deep borehole in study site, fractured rocks crossing were first classified and nonfractured zones by core logging geophysical loggings, such as acoustic televiewing, density, flow loggings. After conducting tests constant head withdrawal recovery at zones, analyses carried out, which results evaluated . For...