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Characterization of preferential flow paths between boreholes in fractured rock using a nanoscale zero-valent iron tracer test

Recent advances in borehole geophysical techniques have improved characterization of cross-hole fracture flow. The direct detection of preferential flow paths in fractured rock, however, remains to be resolved. In this study, a novel approach using nanoscale zero-valent iron (nZVI or ‘nano-iron’) as a tracer was developed for detecting fracture flow paths directly. Generally...

Impacts of hydrogeological characteristics on groundwater-level changes induced by earthquakes

Changes in groundwater level during earthquakes have been reported worldwide. In this study, field observations of co-seismic groundwater-level changes in wells under different aquifer conditions and sampling intervals due to near-field earthquake events in Taiwan are presented. Sustained changes, usually observed immediately after earthquakes, are found in the confined aquifer...

Mapping fracture flow paths with a nanoscale zero-valent iron tracer test and a flowmeter test

The detection of preferential flow paths and the characterization of their hydraulic properties are important for the development of hydrogeological conceptual models in fractured-rock aquifers. In this study, nanoscale zero-valent iron (nZVI) particles were used as tracers to characterize fracture connectivity between two boreholes in fractured rock. A magnet array was installed...

Streamflow Changes in the Vicinity of Seismogenic Fault After the 1999 Chi–Chi Earthquake

. Streamflow; gauge; Chi-Chi earthquake; deformation; groundwater - CHING-YI LIU,1 YEEPING CHIA,1 PO-YU CHUANG,1,2 CHI-YUEN WANG,3 SHEMIN GE,4 and MAO-HUA TENG1 1. Introduction Hydrological changes