Simplification of crop shortage water index and its application in drought remote sensing monitoring

Abstract

Abstract: Based on the principle of energy balance, the method for calculating latent evaporation was simplified, and hence, the construction of the drought remote sensing monitoring model of crop water shortage index was also simplified. Since the modified model involved fewer parameters and reduced computing times, it was more suitable for the operation running in the routine services. After collecting the concerned meteorological elements and the NOAA/AVHRR image data, the new model was applied to monitor the spring drought in Guanzhong, Shanxi Province. The results showed that the monitoring results from the new model, which also took more considerations of the effects of the ground coverage conditions and meteorological elements such as wind speed and the water pressure, were much better than the results from the model of vegetation water supply index. From the view of the computing times, service effects and monitoring results, the simplified crop water shortage index model was more suitable for practical use. In addition, the reasons of the abnormal results of C_WSI>1 in some regions in the case studies were also discussed in this paper.

Key words: Crop water shortage index, Drought, Remote sensing, Monitoring

CLC Number:

P407.8

LIU Anlin, LI Xingmin, HE Yanbo, DENG Fengdong . Simplification of crop shortage water index and its application in drought remote sensing monitoring[J]. Chinese Journal of Applied Ecology, 2004, (2): 210-214.

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