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| Comparison and Application of Drought Monitoring Remote Sensing Indices in the Hedong Area of Gansu, China |
| Wang Ying1, Sha Sha1, Zhang Lei2 |
1. Key Laboratory of Arid Climatic Change and Disaster Reduction of Gansu Province/Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. State Key Laboratory of Grassland Agro-ecosystems/College of Pastoral Agriculture Science and Technology, Lanzhou Univestity, Lanzhou 730020, China |
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Abstract Drought is one of the major meteorological disasters which affect the agricultural production in the Hedong Area, Gansu, China. Various remote sensing indices of agriculture drought are proposed, but it is difficult to decide which one is more appropriate. Analysis on the construction principle and simulation results of seven remote sensing indices was made with the relative soil moisture and MODIS data in different depth from 30 agriculture meteorological stations in the studied area. Then the appropriate remote sensing indices were chosen to monitor the temporal and spatial distribution of drought in the area in 2006. The results showed that the seven remote sensing indices could reflect the spatiotemporal variation of soil moisture in the studied area. The best depth for monitoring soil moisture was 20 cm by the seven remote sensing indices, followed by 10 cm. A dynamic change of relative soil moisture during different seasons showed that monitoring effects of PDI and MPDI were good in spring, VSWI and NDWI were good in summer, and in addition to MEI, the other indexes were good in autumn. According to the correlation coefficients between the indexes and relative soil moisture, we selected PDI and MEI in spring, VSWI and NDWI in summer and PDI and MPDI in autumn to monitor the drought in Hedong Area in 2006. By considering the frequency of each drought grade and the relative soil moisture, we evaluated the drought grade for each indexes. Monitoring results showed that the drought occurred continuously in spring, late spring and early summer, midsummer, and autumn in the northern part of Qingyang. The continuous drought was very serious in the northern part of Longzhong and Qingyang.
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Received: 13 June 2014
Published: 20 July 2015
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2015, Vol. 35 
