Geoscience Reference
In-Depth Information
20
(b) Walnut Gulch, Arizona
Q
(d) Tanque Verde Creek,
Arizona
15
Water
discharge,
Q
(m
3
s
-
1
)
200
3
50
10
Mean
water
velocity,
2
_
_
5
u
(m s
-
1
)
u
1
0
0
4
8
0
1.5
0
1 500 000
(c) Nahal Yael, Israel
100
1.0
1 000 000
Fr
Froude No:
0.5
_
Fr = uY
0.5
500 000
Re
0
0.0
100
0
1.0
Unit stream
power,
ω = ρg
QS
w
50
0
0
6
12
18
0
0
2
4
6
8
(W m
-
2
)
0
0
1
2
Time (hour)
Figure 13.5
Flood hydrographs and hydraulic parameters of ephemeral rivers in desert regions: (a) Il Kimere, Kenya (after Reid
and Frostick, 1987); (b) Walnut Gulch, Arizona (after Renard and Laursen, 1975); (c) Nahal Yael, Israel (after Lekach and Schick,
1982); (d) Tanque Verde Creek, Arizona (after Hjalmarson, 1984). Note that the unit of the time axis is an hour.
(a)
(c)
(b)
