| Variation of drought in Shaanxi from 2004 to 2014 based on remotely sensed data |
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| DOI：10.7606/j.issn.1000-7601.2018.01.33 |
| Key Words: variation of drought remote sensing temperature vegetation drought index wetness index Shaanxi |
| Author Name | Affiliation | | WEN Guo-tao | School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an, Shaanxi 710119, China | | BAI Jian-jun | School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an, Shaanxi 710119, China | | SUN Song-song | School of Geography and Tourism, Shaanxi Normal University, Xi'an, Shaanxi 710119, China
National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an, Shaanxi 710119, China |
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| Abstract: |
| NDVI, simple linear regression method, Theil-Sen Median trend analysis method and Mann-Kendall test method were used to calculate the monthly TVDI in Shaanxi from 2004 to 2014, thereby analyzing the spatial distribution features，temporal variation features and the evolution trend of drought. The results indicate that: (1) The occurrence frequency of drought in Shaanxi province was higher in the north and lower in the south，with Shanbei, Guanzhong and Shannan being 68.2%、53.8% and 22.7% respectively. (2) The drought of Shaanxi province mainly occurred in spring, the average TVDI in spring over the past eleven years varied between 0.6 and 0.7. (3) The drought of Shaanxi province showed a downward trend as a whole. (4) TVDI was consistent with wetness index on monitoring drought, and annual TVDI value had a significantly negative correlation with annual precipitation, precipitation was an important meteorological factor causing the decline of TVDI. |
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