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| DOI： |
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| Analyzing the Drought Characteristic of Zunyi Using the Accumulated Relative Humidity Index |
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QIAO Shanshan, PAN Hongwei, LEI Hongjun, XU Jianxin, SAHNG Chongju
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School of Water Conservancy, North China University of Water Conservancy and Electric Power, Zhengzhou 450045, China; Center for Disaster Prevention and Mitigation, Water Resources Research Institute of Guizhou Province, Guiyang 550002, China
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| Abstract: |
| This paper analyzed the characteristics of drought in Zunyi based on national meteorological data measured from weather stations within Zunyi City and its proximal areas from 1953 to 2012. The accumulated relative humidity index （Ma） was calculated from the actual crop evapotranspiration and the effective rainfall in a Karst region. The results showed that from 1953 to 2012, the annual average net irrigation water requirement ranged from 160 mm to 353 mm in this region. The value of Ma in seven counties of Zunyi decreased with the inter-annual Ma ranging from -0.44 to 0.68 and the annual average ranging from -0.24 to 0.23. The likely occurrence of drought was between August and October. The accumulated humidity index Ma in the region decreased from the north to the south. Tongzi County, Meitan County, Yuqing County and Zunyi County were the counties where greatest care should be taken in managing droughts. |
| Key words: Zunyi city; accumulated humidity index; agricultural drought; spatial and temporal distribution; influencing factor |
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