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Table 3 Computation of LNRF model on landslide determining Factors

From: Landslide susceptibility mapping using knowledge driven statistical models in Darjeeling District, West Bengal, India

Parameters

Area

Landslides Area

LNRF

Fuzzy membership values using LNRF model

In Hectare

In Percentage

In Hectare

In Percentage

Rainfall (mm)

 Very Low (1877.38–1991.97)

27659.36

8.78

0

0

0

0

 Low (1991.97–2090.54)

24856.96

7.89

0

0

0

0

 Moderate (2090.45–2167.44)

80967.44

25.71

31.56

7.32

0.37

0.11

 High (2167.44–2239.06)

114335.78

36.31

294.58

68.29

3.41

1.00

 Very High (2239.06–2333.96)

67080.46

21.3

105.21

24.39

1.22

0.36

Slope (Degree)

 Very Low (0–9.32)

101505.25

32.23

14.5

3.36

0.17

0.11

 Low (9.32–18.64)

58545.55

18.59

52.56

12.18

0.61

0.39

 Medium (18.44–27.34)

70795.02

22.48

103.31

23.95

1.2

0.76

 High (27.34–36.66)

57571.95

18.28

135.93

31.51

1.58

1.00

 Very High (36.66–79.23)

26482.23

8.41

125.06

28.99

1.45

0.92

Altitude (m)

 Very Low (15–422.93)

115880.61

36.8

35.17

8.15

0.41

0.16

 Low (422.93–985.6)

71784.89

22.8

224.01

51.93

2.6

1.00

 Medium (985.6–1576.4)

63320.09

20.11

81.46

18.88

0.94

0.36

 High (1576.4–2279.73)

44471.47

14.12

72.2

16.74

0.84

0.32

 Very High(2279.73–3602)

19442.94

6.17

18.51

4.29

0.21

0.08

Aspect

 Flat (−1)

163.37

0.05

0

0

0

0

 North (0–22.5)

20317.92

6.45

7.41

1.72

0.09

0.07

 North-East (22.5–67.5)

39614.59

12.58

25.92

6.01

0.3

0.22

 East (67.5–112.5)

39009.88

12.39

59.24

13.73

0.69

0.51

 South-East (112.5–157.5)

44774.25

14.22

87.01

20.17

1.01

0.75

 South (157.5–202.5)

45083.47

14.32

116.63

27.04

1.35

1.00

 South-West (202.5–247.5)

39204.16

12.45

70.35

16.31

0.82

0.61

West (247.5–292.5)

32441.32

10.3

49.98

11.59

0.58

0.43

 North-West (292.5–337.5)

35974.84

11.42

12.96

3

0.15

0.11

 North (337.5–360)

18316.21

5.82

1.85

0.43

0.02

0.01

Geology

 Triassic

166113.98

52.75

302.86

70.21

3.51

1

 Cenozoic

23200.35

7.37

82.6

19.15

0.96

0.27

 Pliocene-Pleistocene

11258.98

3.58

45.89

10.64

0.53

0.15

 Holocene

58152.53

18.47

0

0

0

0

 Middle-upper Pleistocene

56174.15

17.84

0

0

0

0

Soil texture

 Gravelly loamy

23549.04

7.48

68.11

15.79

0.79

0.46

 Fine loamy Coarse Loamy

126713.02

40.24

113.51

26.32

1.32

0.77

 Gravelly loamy, Loamy Skeletal

38586.66

12.25

147.57

34.21

1.71

1

 Gravelly Loamy Coarse Loamy

120449.25

38.25

90.81

21.05

1.05

0.61

 Coarse Loamy

5602.03

1.78

11.35

2.63

0.13

0.08

Distance from River (km)

 0–0.42 km

99542.45

31.61

73.65

17.07

0.85

0.37

 0.42–1.10 km

110752.04

35.17

199.89

46.34

2.32

1

 1.10–1.66 km

64340.57

20.43

115.73

26.83

1.34

0.58

 1.66–2.26 km

32920.37

10.45

42.08

9.76

0.49

0.21

 2.26–4.33 km

7344.58

2.33

0

0

0

0

Distance from Lineament (km)

 0–1.54 km

81563.6

25.9

110.6

25.64

1.28

0.77

 1.54–2.85 km

95262.67

30.25

44.24

10.26

0.51

0.31

 2.85–4.20 km

77028.98

24.46

143.78

33.33

1.67

1.00

 4.20–5.75 km

44870.1

14.25

99.54

23.08

1.15

0.69

 5.75–10.12 km

16174.66

5.14

33.18

7.69

0.38

0.23

Distance from Road (km)

 0–1.74 km

140275.58

44.55

88.48

20.51

1.03

0.67

 1.74–3.94 km

84741.4

26.91

44.24

10.26

0.51

0.33

 3.94–6.72 km

50166.43

15.93

66.36

15.38

0.77

0.50

 6.72–10.22 km

27267.21

8.66

132.72

30.77

1.54

1.00

 10.22–16.49

12449.37

3.95

99.54

23.08

1.15

0.75

Land use/Land cover

 Water bodies

3466.31

1.1

39.87

9.24

0.46

0.16

 Vegetation

227240.32

72.16

255.55

59.24

2.96

1.00

 Fallow land

14437.29

4.58

29

6.72

0.34

0.11

 Agricultural Land

65442.75

20.78

106.93

24.79

1.24

0.42

 Settlement

4313.33

1.37

0

0

0

0.00

NDVI

 Very Low (−0.07–0.12)

37936.34

12.05

114.18

26.47

1.32

0.91

 Low (0.12–0.17)

83384.9

26.48

125.06

28.99

1.45

1.00

 Medium (0.17–0.23)

85506.39

27.15

96.06

22.27

1.11

0.77

 High (0.23–0.29)

70015.86

22.23

65.25

15.13

0.76

0.52

 Very High (0.29–0.49)

38056.51

12.09

30.81

7.14

0.36

0.25

TWI

 Very Low (1.95–7.37)

49986.44

15.87

63.12

14.63

0.73

0.35

 Low (7.37–8.53)

113766.56

36.13

178.85

41.46

2.07

1.00

 Medium (8.53–9.76)

93346.92

29.64

115.73

26.83

1.34

0.65

 High (9.76–11.70)

46923.5

14.9

73.65

17.07

0.85

0.41

 Very High (11.70–18.91)

10876.58

3.45

0

0

0

0