Single‐hole GPR reflection imaging of solute transport in a granitic aquifer

  title={Single‐hole GPR reflection imaging of solute transport in a granitic aquifer},
  author={Caroline Dorn and Niklas Linde and Tanguy Le Borgne and Olivier Bour and Ludovic Baron},
  journal={Geophysical Research Letters},
Identifying transport pathways in fractured rock is extremely challenging as flow is often organized in a few fractures that occupy a very small portion of the rock volume. We demonstrate that saline tracer experiments combined with single‐hole ground penetrating radar (GPR) reflection imaging can be used to monitor saline tracer movement within mm‐aperture fractures. A dipole tracer test was performed in a granitic aquifer by injecting a saline solution in a known fracture, while repeatedly… 

Inferring transport characteristics in a fractured rock aquifer by combining single‐hole ground‐penetrating radar reflection monitoring and tracer test data

Investigations of solute transport in fractured rock aquifers often rely on tracer test data acquired at a limited number of observation points. Such data do not, by themselves, allow detailed

Imaging Fracture Anisotropic Flow Channeling Using GPR Signal Amplitude and Phase

Summary Flow in fractured rocks is highly heterogeneous and occurs along preferred pathways referred as flow channels. Conventional borehole hydraulic tests do not capture the heterogeneous flow

Hydrogeophysical characterization of transport processes in fractured rock by combining push‐pull and single‐hole ground penetrating radar experiments

The in situ characterization of transport processes in fractured media is particularly challenging due to the considerable spatial uncertainty on tracer pathways and dominant controlling processes,

4D Tracer Flow Reconstruction in Fractured Rock through Borehole GPR Monitoring

Abstract. Two borehole ground penetrating radar (GPR) surveys were conducted during saline tracer injection experiments in fully-saturated crystalline rock at the Grimsel Test Site in Switzerland.

Monitoring salt tracer transport in granite rock using ground penetrating radar reflection imaging

Investigating preferential flow paths and fractures in rock formations is a crucial task in ongoing research for geothermal reservoir characterization. The work presented here relies on ground

Time-lapse ground penetrating radar difference reflection imaging of saline tracer flow in fractured rock

The characterization of flow and transport processes in fractured rock is challenging because they cannot be observed directly and hydrologic tests can only provide sparse and local data. Time-lapse

Permeability Enhancement From a Hydraulic Stimulation Imaged With Ground Penetrating Radar

We present evidence of permeability enhancement from hydraulic stimulation experiments in fractured crystalline rock. A total of 9.49 m3 was injected in two fractured intervals of a 300 m long

Four-dimensional tracer flow reconstruction in fractured rock through borehole ground-penetrating radar (GPR) monitoring

Abstract. Two borehole ground-penetrating radar (GPR) surveys were conducted during saline tracer injection experiments in fully saturated crystalline rock at the Grimsel Test Site in Switzerland.

Computing Localized Breakthrough Curves and Velocities of Saline Tracer from Ground Penetrating Radar Monitoring Experiments in Fractured Rock

Solute tracer tests are an established method for the characterization of flow and transport processes in fractured rock. Such tests are often monitored with borehole sensors which offer high

Comparison of Hydraulic and Tracer Tomography for Discrete Fracture Network Inversion

Fractures serve as highly conductive preferential flow paths for fluids in rocks, which are difficult to exactly reconstruct in numerical models. Especially, in low-conductive rocks, fractures are



Comparing flux‐averaged and resident concentration in a fractured bedrock using ground penetrating radar

Saline tracer transport experiments were performed to compare flux‐averaged and resident concentration in a single subhorizontal fracture in sandstone bedrock. Tracer migration over a 14 m distance

Time‐lapse imaging of saline‐tracer transport in fractured rock using difference‐attenuation radar tomography

Accurate characterization of fractured‐rock aquifer heterogeneity remains one of the most challenging and important problems in groundwater hydrology. We demonstrate a promising strategy to identify

Four dimensional mapping of tracer channelization in subhorizontal bedrock fractures using surface ground penetrating radar

To observe flow channeling in situ, surface ground‐penetrating radar (GPR) was used to detect a saline tracer moving through a sub‐horizontal bedrock fracture. The tracer is mapped using amplitude

Ground-penetrating-radar response to fracture-fluid salinity: Why lower frequencies are favorable for resolving salinity changes

Time-lapse ground-penetrating-radar GPR surveys exploit signal-amplitude changes to monitor saline tracers in fractures and to identify groundwater flow paths. However, the relationships between GPR

A Practical Guide to Wavelet Analysis.

A practical step-by-step guide to wavelet analysis is given, with examples taken from time series of the El Nino–Southern Oscillation (ENSO). The guide includes a comparison to the windowed Fourier