The application study of using temperature vegetation dryness index in regional drought monitoring

摘要

In this study, the temperature vegetation dryness index (TVDI) which derived from NOAA/AVHRR data was applied to monitor the severe drought in Sichuan Basin in the summer of 2006. The result using TVDI shown : the drought developed rapidly in the last ten days of July, and became most severe at the end of August, then alleviated in the first ten days of September. The change trends of TVDI with low rainfall and high air temperature were basically consistent. The sensitivity of TVDI to air temperature and principle was also analyzed. TVDI had positive correlation with temperature, negative correlation with precipitation. TVDI is an effective method for the monitoring of the regional drought.