Risk assessment of landslide-induced surge disaster of river type reservoir in mountainous area

Figures & data

Figure 1. Hierarchy of landslide-induced surge risk assessment.

Table 1. Judgment matrix of A-B layer.

A	B1	B2	W
B1	b11	b12	Wb1
B2	b21	b22	Wb2

Table 2. Judgment matrix of B₁-C layer.

B1	C1	C2	W
C1	C11	C12	WC1
C2	C21	C22	WC2

Table 3. Judgment matrix of B₂-C layer.

B2	C3	C4	C5	C6	W
C3	C33	C34	C35	C36	WC3
C4	C43	C44	C45	C46	WC4
C5	C53	C54	C55	C56	WC5
C6	C63	C64	C65	C66	WC6

Table 4. Judgment matrix of A-C layer.

	B
C	B1	B2	…	Bn
C	Wb1	Wb2	…	Wbn	W Total weight
C1	WC1	0	…	0	W1
C2	0	Wc2	…	0	W2
…	…	…	…	…	…
Cn	0	0	0	WCn	Wn

Table 5. Average random consistency index chart.

Order	1	2	3	4	5	6	7	8	9	10	11	12
RI	0	0	0.52	0.89	1.12	1.26	1.36	1.41	1.49	1.49	1.52	1.54

Table 6. Classification of evaluation factors and determination criteria for different levels.

	Risk factor classification
Discriminant	High (1)	Medium (0.618)	Low (0.382)
Landslide scale	≥10 × 10^4 m^3	1 × 10^4 m^3 to 10 × 10^4m^3	≤1 × 10^4 m^3
Slope angle	≥40^0	20^0 to 40^0	≤20^0
Initial position of landslide mass	Above water	Partial submergence	Underwater
Reservoir operating level	Low	Medium	High
Wave height	≥0.6 m	0.4 to 0.6 m	≤0.4 m
Runup	≥1.0 m	0.5 to 1.0 m	≤0.5 m

Table 7. Criteria for risk classification.

Risk level	Judgement index ($D_L$)	Risk assessment
I	≥0.75	High
II	0.50–0.75	Medium
III	≤0.50	Low

Table 8. Judgment matrix of layer A-B.

A	B1	B2	W
B1	1	2	0.6667
B2	1/2	1	0.3333

Table 9. Judgment matrix of layer B₁-C.

B1	C1	C2	W
C1	1	1/3	0.2500
C2	3	1	0.7500

Table 10. Judgment matrix of layer B₂-C.

B2	C3	C4	C5	C6	W
C3	1	3	2	5	0.4717
C4	1/3	1	2	5	0.2723
C5	1/2	1/2	1	3	0.1875
C6	1/5	1/5	1/3	1	0.0685

Table 11. General layer judgment matrix A-C.

B	B1	B2
C	0.6667	0.3333	W Total weight
C1	0.25	0	0.5000
C2	0.75	0	0.1667
C3	0	0.4717	0.1572
C4	0	0.2723	0.0908
C5	0	0.1875	0.0625
C6	0	0.0685	0.0228

Table 12. Effect factors of evaluation factors of swell waves in Hongyanzi landslide.

Evaluation factor	Wave height	Runup	Landslide scale	Slope angle	Initial position of landslide mass	Reservoir operating level
Interaction index	1	1	1	0.618	0.618	0.618