JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (7): 1145-1157.doi: 10.11849/zrzyxb.20160655

• Resource Evaluation • Previous Articles     Next Articles

Remote Sensing Monitoring of Summer Drought at Monthly-scale Considering Vegetation, Temperature and Precipitation in Sichuan Province

LU Xiao-ning1, ZHANG Jing-yi1, WANG Ling-ling2, MENG Cheng-zhen1, ZENG De-yu1   

  1. 1. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China;
    2. Zigong Meteorological Bureau, Zigong 643000, China
  • Received:2016-06-22 Revised:2016-11-01 Online:2017-08-02 Published:2017-08-02
  • Supported by:
    National Natural Science Foundation of China, No. 41401103Sichuan Province Science and Technology Plan Applied Basic Research, No. 2014JY0084.

Abstract: Considering the comprehensive role of precipitation (TRM), vegetation (VCI) and surface thermal state (TCI) in the occurrence and development of droughts, a drought monitoring model is constructed at monthly scale in Sichuan Province based on remote sensing data during 2000-2015. Furthermore, the condition, evolution trend and frequency of droughts in different morphological areas are discussed. The results show as follows: 1) The SDCI modes is the most applicable model for drought monitoring at month scale in mountain areas, which can be described as SDCI=0.25×VCI+0.5×TRM+0.25×TCI. This model embodies the importance of precipitation in drought monitoring. 2) In temporal scale, the intensities of droughts in July are the strongest, while those in August become weaker. In spatial scale, the intensities of droughts in East Sichuan Basin are the strongest in both July and August, then followed by those in the transition area between Plateau and Basin, while those in plateau area in west of Sichuan is the weakest. 3) In greatly, the summer drought in July becomes weaker while the summer drought in August becomes more severe. However, it shows spatial difference. The summer drought in east Sichuan Province becomes aggravated in July but weaker in August; while in plateau and basin transition zone and western Sichuan Plateau, the summer drought becomes weaker in July but aggravated in August. 4) The frequency of occurrence of droughts is the highest in the eastern Sichuan Basin, followed by the plateau and basin transition zone, and then the western Sichuan Plateau. Moderate droughts occurred frequently in eastern Sichuan Basin and Plateau and Basin transition zone, while mild droughts occurred frequently in the Western Sichuan Plateau.

Key words: drought, geomorphic regionalization, remote sensing monitoring, Sichuan Province

CLC Number: 

  • P426.616