Risk Assessment of Drought in the Yangtze River Delta Based on Natural Disaster Risk Theory

Table 2

Assignment table of terrain vulnerability.

Terrain elevation (m)	Topographic standard deviation
	0–10	10–25	25–50	≥50
<100	0.3	0.4	0.5	0.6
100–200	0.4	0.5	0.6	0.7
200–500	0.5	0.6	0.7	0.8
≥500	0.6	0.7	0.8	0.9