Temporal and spatial variation characteristics of drought in Panxi region based on TVDI
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DOI:10.7606/j.issn.1000-7601.2024.01.26
Key Words: drought  remote sensing monitoring  TVDI  temporal and spatial variation  Panxi region
Author NameAffiliation
DENG Jinshan Hydraulic Science Research Institute of Sichuan ProvinceChengduSichuan 610072China 
LI Zhuoman Hydraulic Science Research Institute of Sichuan ProvinceChengduSichuan 610072China 
CHEN Shangshu Water Security and Flood and Drought Disaster Prevention Center of Sichuan ProvinceChengduSichuan 610041China 
CHEN Yue Hydraulic Science Research Institute of Sichuan ProvinceChengduSichuan 610072China 
LI Liangdong Water Security and Flood and Drought Disaster Prevention Center of Sichuan ProvinceChengduSichuan 610041China 
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Abstract:
      Land surface temperature data (LST) and normalized vegetation index (NDVI) of MODIS were used to construct Ts-NDVI feature space, and the temporal and spatial variation of drought in Panxi region from 2001 to 2020 were analyzed by calculating the temperature vegetation drought index (TVDI). The results showed that:(1) From the perspective of time, the annual mean TVDI in Panxi area varied between 0.5481 and 0.5820 in 2001-2020, and decreased slowly at a rate of -0.0001·a-1, and there was a large\|scale medium drought in 2001 and 2009. The seasonal drought was characterized by dry winter and dry spring. The average TVDI of each season was 0.5618 in winter, 0.6058 in spring, 0.5590 in summer and 0.5365 in autumn, indicating that drought was more likely to occur in winter and spring than in summer and autumn.The monthly average value of TVDI was 0.6089 in May, the lowest value was 0.5204 in September. From February to June each year, the drought was mainly moderate. The drought eased in July and turned to light drought. In October, the drought gradually increased from light drought. (2) From the perspective of space, there was a significant difference between the north and the south in the variation trend of drought in Panxi. The frequency and scope of drought in the south were higher than those in the north, showing a spatial distribution characteristic of higher in the middle, south, southwest, and lower in the north, northwest,northeast. (3) From the perspective of typical drought years, the spatial distribution of spring dry farmland in Panxi in 2001, 2006 and 2011 had certain similarities. Among them, the cultivated land affected by moderate drought was mainly distributed in the north and middle of Panxi. The cultivated land affected by severe drought was mainly distributed in the southwest of Panxi. The results showed that the drought situation in Panxi eased slightly from 2001 to 2020, and the drought varied greatly among different seasons, and the drought scope was mainly in the central and southern Panxi.