Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-hole GPR reflection imaging of solute transport in a granitic
  aquifer   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 acquiring single-hole GPR sections in the
pumping borehole located 6 m away. The final depth-migrated difference sections
make it possible to identify consistent temporal changes over a 30 m depth
interval at locations corresponding to fractures previously imaged in GPR
sections acquired under natural flow and tracer-free conditions. The experiment
allows determining the dominant flow paths of the injected tracer and the
velocity (0.4-0.7 m/min) of the tracer front.

31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg