Table 2 Results of the mean velocities in each section and the corresponding rates of deceleration for each test.

From: The effect of tetrahedron framed permeable weirs on river bed stability in a mountainous area under clear water conditions

No.

U u (cm/s)

U d (cm/s)

∆U (cm/s)

η (%)

1

60.04

43.95

16.08

26.79

2

60.22

53.84

6.39

10.60

3

58.35

36.81

21.54

36.91

4

53.03

37.92

15.11

28.50

5

58.79

43.33

15.46

26.30

6

47.93

45.22

2.72

5.67

  1. Note: U u  = mean velocity in section upstream the TFPW; U d  = mean velocity in section downstream of the TFPW; ∆U = difference between the mean velocities in sections upstream and downstream of the TFPW; η = deceleration rate of the mean velocities in each section.
Back to article page