Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (11): 1859-1875.doi: 10.1007/s11442-019-1993-z
• Research Articles • Previous Articles Next Articles
CHEN Qiong1, LIU Fenggui1,2, CHEN Ruijie1, ZHAO Zhilong2, ZHANG Yili2,3,4,*(), CUI Peng2,3,5, ZHENG Du2
Received:
2018-07-11
Accepted:
2019-03-06
Online:
2019-11-25
Published:
2019-12-05
Contact:
Yili ZHANG
E-mail:zhangyl@igsnrr.ac.cn
About author:
Chen Qiong (1975–), Associate Professor, specialized in land change science and GIS. E-mail: qhchen-qiong@163.com
Supported by:
CHEN Qiong, LIU Fenggui, CHEN Ruijie, ZHAO Zhilong, ZHANG Yili, CUI Peng, ZHENG Du. Trends and risk evolution of drought disasters in Tibet Region, China[J].Journal of Geographical Sciences, 2019, 29(11): 1859-1875.
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Table 1
The index system used in drought disaster hazard assessment"
Grade I indexes | Grade II indexes | Grade Ⅲ indexes |
---|---|---|
$H$ Risk | Hl Historical risk (0.4) | Historical drought frequency (0.500); Historical drought intensity (0.500) |
Hq Potential risk (0.6) | Annual mean precipitation (0.530); Annual mean temperature (0.173); Average runoff depth (0.297) |
Table 2
The index system of drought disaster vulnerability assessment"
Grade I indexes | Grade II indexes | Grade Ⅲ indexes | |
---|---|---|---|
V | E Physical exposure (0.286) | Number of animals per unit area/cultivated area (0.173); Population density (0.297); Proportion of agricultural output/Proportion of animal husbandry output (0.530) | |
Vulnerability | S Susceptibility (0.286) | Dry land proportion/Grassland proportion (0.667); Grain yield/ Proportion of large domestic animals (0.333) | |
D ability to cope (0.428) | Di Basic disaster capability (0.6) | Per-capita net income of farmers and herdsmen (0.317); Per cultivated area/Per grassland area (0.091); Grain output per capita/Livestock per capita (0.091); Average cultural level of farmers and herdsmen (0.2); Topographic relief (0.091); Government emergency management capability (0.210) | |
Dz Special disaster capacity (0.4) | Meteorological station density (0.167); Engineering disaster prevention ability (0.833) |
Figure 2
Spatio-temporal variation of drought disasters in the Tibet Region (a) Frequency of drought disasters in the TR from 1912 to 2012; (b) A wavelet analysis of the cyclic variation of drought disasters in the TR from 1965 to 2015; (c) The spatial pattern of changes in the frequency of drought disasters in the TR (red for increasing areas, blue for decreasing areas) "
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