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Arid Land Geography ›› 2019, Vol. 42 ›› Issue (4): 735-744.doi: 10.12118/j.issn.1000-6060.2019.04.04

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Monitoring and analysis of historical drought in southeast Tibet based on multi-source data

XIONG Junnan1,2,LI Wei1,LIU Zhi3,CHEN Weiming2,FAN Chunkun4,ZHANG Hao1   

  1. 1 School of Civil Engineering and Architecture,SWPU,Chengdu 610500,Sichuan,China;  2 State Key Laboratory of Resources and Environmental Information System, Institute of Geographic and Natural Resources  Research,Chinese Academy of Sciences,Beijing 100101,China;3 Sichuan Provincial Coalfield Surveying and Mapping Engineering Institute,Chengdu 610072,Sichuan,China;4 Agriculture Research Institute,Tibet Academy of Agriculture and Animal Husbandry Sciences,Lhasa 850000,Tibet,China
  • Received:2018-11-29 Revised:2019-02-24 Online:2019-07-25 Published:2019-07-24

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Abstract: As one of the global natural disasters which take place frequently,drought has caused problems in society,economy,and ecological environment. Based on the MODIS,TRMM and SRTM-DEM data from 2001 to 2015 as the data sources,this paper takes the main farming area of Tibet Province,China as the research area and constructed a regional drought comprehensive monitoring model by using the spatial principal component analysis method and adopting the vegetation state index (VCI),temperature condition index (TCI) and precipitation state index (PCI).The accuracy and reliability of the model is verified.The model was then used to identify the monthly drought in the study area from 2001 to 2015,and the geospatialtemporal analysis method was used to study the characteristics and trends of drought changes in the study area.The results show that the drought comprehensive monitoring index (DCMI) can better reflect the changes of regional soil relative humidity and standardized precipitation evapotranspiration index (SPEI),and the comprehensive drought monitoring model has good applicability.The spatial distribution of annual drought frequency in the west of the study area was higher than that in the east,and the drought frequency in most areas was less than 20%,and about 12.41% of the regions had a drought frequency more than 20%.From the perspective of the frequency of droughts in different grades,Shigatse City was a light drought and moderate drought area,while the severe drought areas were concentrated in the central and eastern parts of Shigatse City and Changdu City.The spatial pattern of monthly drought frequency in the study area was quite different.The drought in the whole year was prone to occur in January,August and November,and there were differences in the drought prone months in some areas.The change trend of drought in the study area was quite different during a year.From October to September,the drought intensified area showed a trend of gradually shifting from the east to the west of the cultivated area along the month.

Key words: multi-source data, drought, monitoring, Tibet