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Table 2 Summary of the tracer transport parameters

From: Solute tracer test quantification of the effects of hot water injection into hydraulically stimulated crystalline rock

Monitoring location

Test 8

Test 9

Changea (%)

Recovery, R (%)

 AU tunnel

\(\sim\) 65

\(\sim\) 23

− 64

 PRP1-int3

2.84

2.02

− 29

 PRP2-int2

2.47

1.46

− 41

 PRP1-int2

0.97

2.17

123

Peak arrival time, \(t_{p}\) (min)

 AU tunnel

235

375

60

 PRP1-int3

30

18

− 41

 PRP2-int2

122

183

50

 PRP1-int2

950

3020

218

Mean residence time, \(t^{*}\) (min)

 AU tunnel

2242

1383

− 38

 PRP1-int3

1232

286

− 77

 PRP2-int2

866

1511

75

 PRP1-int2

2126

3373

59

 Swept volume, \(V_{p}\) m3

 AU tunnel

\(\sim\)3.05

\(\sim\)0.57

− 81

 PRP1-int3

0.074

0.010

− 86

 PRP2-int2

0.045

0.040

− 12

 PRP1-int2

0.043

0.13

202

Dispersion, \(m_{2,c}\) (\({\text{min}}^{2}\))

 AU tunnel

4.63E+06

1.31E+06

− 72

 PRP1-int3

2.76E+06

1.91E+05

− 93

 PRP2-int2

8.54E+05

1.94E+06

127

 PRP1-int2

1.24E+06

2.15E+06

73

Gini coefficient, G (–)

 AU tunnel

0.50

0.44

− 13

 PRP1-int3

0.64

0.67

4

 PRP2-int2

0.54

0.50

− 7

 PRP1-int2

0.30

0.25

− 16

  1. aChange from Test 8 to Test 9