Fractional Linear Regression Equation in Agricultural Disaster Assessment Model Based on Geographic Information System Analysis Technology
Publié en ligne: 22 nov. 2021
Pages: 275 - 284
Reçu: 17 juin 2021
Accepté: 24 sept. 2021
© 2021 Lihua Wen et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Fig. 1
Spatial distribution of accumulated rainfall in Hebei Province from 08:00 on July 18 to 08:00 on July 21, 2017Fig. 2
Spatial distribution of comprehensive rainfall intensity grades in Hebei Province from 08:00 on July 18 to 08:00 on July 21, 2017Fig. 3
Risk assessment of heavy rain disaster in Hebei Province from 08:00 on July 18 to 08:00 on July 21, 2017Fig. 4
Agricultural impact assessment of heavy rain disaster in Hebei Province from 08:00 on July 18 to 08:00 on July 21, 2017Rainfall duration index assignment standard
Rain duration index |
Number of consecutive rainy days/d |
|
1 |
≥ 6 |
2 |
4 ≤ T < 6 |
3 |
2 ≤ T < 4 |
4 |
<2 |
Evaluation standard of daily precipitation intensity index
Daily Precipitation Intensity Index |
24 h rainfall/mm |
|
1 |
≥ 80.0 |
2 |
60.0–79.9 |
3 |
40.0–59.9 |
4 |
20.0–39.9 |
Elevation and elevation standard deviation evaluation criteria
Terrain elevation/m |
Elevation standard deviation/m |
|
≤ 1 |
1–10 |
≥ 10 |
|
≤ 100 |
0.9 |
0.8 |
0.7 |
100–300 |
0.8 |
0.7 |
0.6 |
300–700 |
0.7 |
0.6 |
0.5 |
≥ 700 |
0.6 |
0.5 |
0.4 |
Grading Standard of Comprehensive Rainfall Intensity Index
Grading standards |
Rain intensity index |
|
Super strong |
1 ≤ RSI ≤ 4 |
Strong |
4 < RSI ≤ 8 |
Stronger |
8 < RSI ≤ 12 |
Medium |
12 < RSI ≤ 16 |