Construction of comprehensive drought index and its application in Jinghui irrigation area
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DOI:10.7606/j.issn.1000-7601.2019.04.30
Key Words: SPEI  NDVI  SSI  SGI  Comprehensive drought index  CRITIC objective weighting method  Jinghui irrigation area
Author NameAffiliation
WANG Xi-zhen College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China 
SU Xiao-ling College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China 
ZHANG Geng-xi College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China 
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Abstract:
      Based on the indices of standardized precipitation evapotranspiration index (SPEI), normalized vegetation index (NDVI), standardized soil moisture index (SSI),and standardized groundwater index (SGI), acomprehensive drought index (CDI) was constructed using the objective weighting method of CRITIC forJinghui irrigation area.The drought index, and the correlation analysis of the self-calibrating palmer drought severity index (sc-PDSI), was used to evaluate its applicability, and the development trend of agricultural drought in the study area in 2002-2013 was analyzed with Mann-Kendall test.The comprehensive drought index (CDI) was strongly correlated with the self-calibrating palmer drought index(sc-PDSI). The correlation coefficient was 0.73 indicating that the comprehensive drought index (CDI) could accurately reflect the drought situation in the study area, and has strong applicability in the study area.The comprehensive drought index (CDI) was used to analyze the drought characteristics of the Jinghui irrigation area. Inter-monthly analysis found that the Jinghuiirrigation area was prone to drought in April, June, and November, while the irrigation areas in February and August were relatively humid. Inter-seasonal analysis found that the irrigation area experienced severe spring drought in 2003. In 2002, severe summer drought and autumn drought occurred. In 2009, a severe winter drought occurred.The inter-annual analysis found that the CDI value of the Jinghuiirrigation area fluctuated at a rate of 0.032·a-1 between 2002 and 2013 indicating that the drought in the study area had a tendency to alleviate.The Mann-Kendall mutation test was used to analyze the drought in the Jinghuiirrigation area. In July 2011, a significant change occurred, and the CDI trend changed from decreasing to increasing indicating that the study area showed a humidification trend after this time point.
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