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1e typical area of the 
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lution d'information, 
al remote sensing 
ge maps in color 
scal 1:5000 and 
p (Scal 1:5000) to 
he image. 
| ortho—images in 
of gully and gully 
o on. 
nd established ba- 
the digital terrain 
ro—computer Dy- 
der-the Support-of 
about the Charac- 
1 piece and the to- 
m and the mean 
perimental site of 
= 
Table 1. The character-of gully length 
  
Length quantity mean length 
Level 
  
  
  
  
| m) (piece) (m) 
| p 
| 35240! 215 165 
27% 20520 | 55 379 
3 | 10594 11 963 
4 2626 | 1 2626 
5 5692 1 5692 
"Total | 74972 | 281 267 
  
  
The mean rate of qully gradation is 4.316. 
2.2.2 The Characters.of the Elevation Change 
The category of the elevation change is 945—1289m 
and the mean elevation is 1064m and the one-half 
area of the change category of relative elevation is 
between 50m and 120m. So we can clearly know 
change degree which the landform has been deteri- 
orated. Seeing figure 1. 
altitude 
Cm» 
1300 — 
1260 4 
1220 4 
1180 4 
1140 4 
1100 
À 
  
1060 
N 
i 
1020 
980 4 
  
L À L 
0 20 40 60 80 100 (9%) 
10 20 30 10 50 
1 2 3 4 5 
1. The percent of area in different elevated zone. 
2. The integral curve of area in different elevated zone. 
3. The mean elevation in the basin. 
Figure 1. Map of the elevation change analysis 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996 
2.2.3 The Character-of the Slope Change 
The mean slope is 21 ^ in the site and that grid—cell 
within 10m x 10m accuracy. The slope of one-third 
area is 19° —25° and the slope of sixty percent 
area is 16 ° —30 ° . So we can clearly know breakup 
degree which surface has been deteriorate. Seeing 
  
figure 2. 
slope 
(degree) 
ol 4 
30 À 
mcn —2 
30 4 
20 4 —3 
10 4 
n T T T T T——P- area 
  
  
20 10 60 80 100 ies 
2 3 4 5 
1. The percent of area in different slope 
2. The integral curve of area in different slope 
3. The mean slope in the basin 
Figure 2. Map of the slope change analysis 
2.2.4 The Character-of the Slope Aspect Change 
The slope aspect has great meaning for researching 
landuse and development of ground surface. We 
analysed the change of sixteen slope aspect based 
on the grid—cell accuracy same above. The sum of 
slope aspect area of south—west is one—fourth of 
total area and the sum of slope aspect area of south 
and south—west and west is one—half of total area. 
This character is a result of the landform