| Application of drought monitoring index constructed based on soil relative wilting moisture in Yunnan |
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| DOI：10.7606/j.issn.1000-7601.2022.04.29 |
| Key Words: drought monitoring soil hydrological parameter relative wilting moisture MCI index Yunnan Province |
| Author Name | Affiliation | | MA Siyuan | Yunnan Climate Center, Kunming, Yunnan 650034, China
Key Laboratory of Monitoring, Warning and Risk Management of Characteristic Agrometeorological Disasters in Arid Regions, China Meteorological Administration, Yinchuan, Ningxia 750004, China | | HE Yuqin | Yunnan Climate Center, Kunming, Yunnan 650034, China | | JIN Yan | Yunnan Climate Center, Kunming, Yunnan 650034, China
Key Laboratory of Monitoring, Warning and Risk Management of Characteristic Agrometeorological Disasters in Arid Regions, China Meteorological Administration, Yinchuan, Ningxia 750004, China | | ZHANG Mingda | Yunnan Climate Center, Kunming, Yunnan 650034, China | | YAN Weixiong | Institute of Meteorological Sciences of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750004, China | | FAN Lizhang | Yunnan Climate Center, Kunming, Yunnan 650034, China |
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| Abstract: |
| By analyzing the hydrogeological parameters of Yunnan soil, the drought monitoring index IRWM based on soil relative wilting moisture was constructed in this paper, and its applicability in Yunnan region was analyzed. The results indicated that the spatial distribution characteristics of the hydrogeological parameters about Yunnan 0~20 cm soil were consistent relatively, which was the utilization rate of soil moisture was higher in east and lower in west, and higher in south and lower in north generally. In terms of the IRWM, the corresponding upper line indexes of light drought, moderate drought, severe drought and extreme drought in Yunnan were 45.6%, 36.5%, 27.5% and 18.4% soil moisture respectively, and the moderate drought was very likely to occur when the relative soil moisture was lower than 60% in most parts of Yunnan. The western edge of Yunnan soil was more sensitive to moisture, and it has the characteristic of high fluctuation of drought. IRWM reduced the interference of extreme precipitation in drought monitoring, and its description on drought disaster was more accurate than MCI. To sum up, the applicability of IRWM was superior to MCI in Yunnan. |
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