Probabilistic Risk Assessment in Medium Scale for Rainfall-Induced Earthflows: Catakli Catchment Area (Cayeli, Rize, Turkey)

Table 1

Descriptive statistics for the conditioning factors.

Parameter	Min.	Max.	Mean	Std. Deviation	Variance
Data
The catchment area (𝑁=266,613)
Topographic parameters
Topographic altitude (m)	6.92	1212.25	357.79	202.88	41161.71
Slope gradient (°)	0.00	60.81	25.47	9.76	95.24
Profile slope curvature (100^−1 m)	−15.28	15.27	0.03	1.88	3.55
Plan slope curvature (100^−1 m)	−13.41	13.58	0.03	1.64	2.69
Hydrotopographic parameters
Topographic wetness index	4.53	20.51	5.63	0.64	0.41
Stream power index	0.00	11.97	1.22	1.30	1.68
Sediment transport capacity index	0.00	611.52	6.46	9.53	90.84
Distance to drainage (m)	0.00	546.08	85.44	69.03	4765.66
Drainage density (km−^1)	0.00	8.32	3.71	1.47	2.16
Environmental factors
Distance to roads (m)	0.00	728.33	123.46	122.16	14922.51
Road density (km^−1)	0.00	9.61	3.45	2.06	4.23
Building density (km^−2)	0.00	170.70	38.89	31.98	1023.01
Norm. difference vegetation index	−0.28	0.73	0.54	0.14	0.02
The earthflows (𝑁=101)
Topographic parameters
Topographic altitude (m)	78.08	449.56	261.87	78.22	6117.68
Slope gradient (°)	3.35	41.33	24.28	7.72	59.65
Profile slope curvature (100^−1 m)	−4.21	4.59	0.18	1.47	2.17
Plan slope curvature (100^−1 m)	−5.24	5.54	−0.57	1.55	2.39
Hydrotopographic parameters
Topographic wetness index	5.06	6.65	5.52	0.29	0.08
Stream power index	0.00	4.24	1.37	0.94	0.88
Sediment transport capacity index	0.00	14.53	6.21	3.74	14.03
Distance to drainage (m)	0.48	314.56	110.22	62.41	3894.78
Drainage density (km^−1)	4.32	6.60	3.54	1.33	1.76
Environmental factors
Distance to roads (m)	2.90	246.86	70.11	52.25	2729.69
Road density (km^−1)	0.64	9.46	4.79	1.94	3.78
Building density (km^−2)	12.81	161.25	62.39	30.04	902.44
Norm. difference vegetation index	0.16	0.68	0.55	0.10	0.01