Saeed Mosmar Alawad, Saeed
developed new drainage channels that not found in 1973 (Figures 4,5). The drainage density in the study area has
increased profoundly from 0.0963 Km/Km2 in 1973 to 0.2176 Km/Km2 in 1993 with an increasing rate of 126%.
Fig.. A:Drainage density-Gedaref region (1973 )
Fig. 5.Drainage density - Gedaref reglon (1993 )
MAP LEGENO
e ' international bouadacy
e Town
ere Railway line
R Jebel and outcrops
-^ Main river
«-_~ Seasonal stream (khor)
Source Landsat image interpretation, dated (1973)
MAP LEGEND
>... international boundry
e Town
epp Rattway line
- Jebel and outcrops
^ Main river
PY d Seasonal siream ( khor)
Source:Landsat image interpretation dated (1985).
The 1973 images show slight degradation rate, while the
degradation rate. The degradation range between slight to high.
Fig..6:Present degradation/erosion rate. Gedaref region
(1993)
1993 map (Figure 6) shows substantial increases in
14
MAP LEGEND
e Town
——— Railway Ime
~~ Main river
vr Seasonal stream
7*9 intérnatonal boundary
em Jebel and outcrops
Source Landsat image Interpretation dated(1985)and fieldwork(1987)
M 2
X (unn “
-
sn ds 30
A
dr
2 d
3
.
-—— ta
-
60
Km
EROSION RATE
None to slight
Modrate
High
Very high
1298 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000.