Journal of Geographical Sciences ›› 2015, Vol. 25 ›› Issue (12): 1452-1466.doi: 10.1007/s11442-015-1245-0
• Research Articles • Previous Articles Next Articles
Guoan TANG1,2,3, Xiaodong SONG4, Fayuan LI1,2,3, Yong ZHANG5, Liyang XIONG1,2,3
Received:
2015-04-01
Accepted:
2015-06-18
Online:
2015-12-31
Published:
2016-01-05
About author:
Author: Ren Huiru (1983-), PhD Candidate, specialized in coastal environment and modeling. E-mail:
Supported by:
Guoan TANG, Xiaodong SONG, Fayuan LI, Yong ZHANG, Liyang XIONG. Slope spectrum critical area and its spatial variation in the Loess Plateau of China[J].Journal of Geographical Sciences, 2015, 25(12): 1452-1466.
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Table 1
Parameters of elevation data on experimental plots"
Site | Area name | 1: 10,000 DEM | |||
---|---|---|---|---|---|
Minimum (m) | Maximum (m) | Mean (m) | Standard deviation (m) | ||
I | Shenmu | 1005 | 1322 | 1197.92 | 49.95 |
II | Yulin | 1110 | 1310 | 1212.20 | 37.27 |
III | Suide | 814 | 1188 | 995.35 | 62.10 |
IV | Yanchuan | 922 | 1251 | 1088.92 | 61.14 |
V | Yanan | 990 | 1404 | 1196.86 | 79.45 |
VI | Ganquan | 1151 | 1432 | 1296.00 | 55.87 |
VII | Yijun | 761 | 1158 | 986.09 | 73.08 |
VIII | Chunhua | 768 | 1188 | 1044.75 | 75.27 |
Table 2
Statistics of SSCA of typical landforms"
Site | Area name | SSCA (km2) 1:10,000 | Landform types |
---|---|---|---|
I | Shenmu | 13.29 | Loess deep incision gorge-hill |
III | Suide | 8.21 | Loess hill-ridge |
IV | Yanchuan | 10.08 | Loess hill-ridge |
VI | Ganquan | 10.60 | Loess ridge-low-mountain |
VII | Yijun | 13.21 | Loess tableland |
VIII | Chunhua | 35.01 | Loess middle-low mountain, loess platform-tableland |
Table 3
Algorithms for slope spectrum indices"
Indicators | Algorithms | Units | Significance |
---|---|---|---|
Gully density | ΣL: The gully distance in watershed A:The area of watershed | km/km2 | Reflecting the fragmentation of the surface |
Skewness of the slope spectrum (S) | σ: Standard deviation | Unitless | Reflecting the distribution of slope gradient combination |
Terrain dynamic force (Td) | Pi: Frequency of each slope class aij: Slope gradient of grid ij j: Number of grid for slope class i | Unitless | Reflecting the erosional potential by the terrain |
Slope of slope (SOS) | fx: The variation rate of slope along x axis fy: The variation rate of slope along y axis | Unitless | Reflecting the complexity of the surface |
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