Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records
Temporal-Spatial Characteristics of Drought in Guizhou Province, China, Based on Multiple Drought Indices and Historical Disaster Records
复制标题
基于多重干旱指数和历史灾害记录的贵州省干旱时空特征
DOI：
10.1155/2018/4721269
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发表时间：
2018-01-01
影响因子：
2.9
通讯作者：
Chen, Xingwei
中科院分区：
文献类型：
--
作者：
Cheng, Qingping;Gao, Lu;Chen, Xingwei
中国贵州省在1960年至2013年期间经历了几次严重的干旱事件，造成了巨大的经济损失和棘手的水资源冲突。利用标准降水指数（SPI）、综合气象干旱指数（CI）和侦察干旱指数（RDI）分析了干旱的时空特征。同时，历史干旱记录被用来测试每个指标在识别干旱的性能。所有这三个指数都显示出每年和秋季的下降趋势，后者尤为突出。1960-2013年期间，SPI、CI和RDI分别识别了29、30和32次干旱事件。持续干旱在冬春和夏秋季节更为频繁。进入世纪以来，中国干旱事件的发生频率、峰值和强度都有明显增加的趋势。CI表示的干旱持续时间在贵州中西部高海拔地区持续时间较长。这些地区相应的干旱严重程度很高。SPI和RDI表明贵州中东部低海拔地区干旱持续时间较长，相应的干旱强度也很强。贵州大部分地区的干旱持续时间和严重程度均呈增加趋势。总体来看，贵州省西部地区的SPI和RDI呈上升趋势，而贵州中东部地区则呈下降趋势。通过与历史资料的对比分析，发现RDI比SPI和CI更能客观、可靠地识别贵州的干旱期。
Guizhou Province, China, experienced several severe drought events over the period from 1960 to 2013, causing great economic loss and intractable conflicts over water. In this study, the spatial and temporal characteristics of droughts are analyzed with the standard precipitation index (SPI), comprehensive meteorological drought index (CI), and reconnaissance drought index ( RDI). Meanwhile, historical drought records are used to test the performance of each index at identifying droughts. All three indices show decreasing annual and autumn trends, with the latter particularly prominent. 29, 30, and 32 drought events were identified during 1960-2013 by the SPI, CI, and RDI, respectively. Continuous drought is more frequent in winter-spring and summer-autumn. There is a significant increasing trend in drought event frequency, peak, and strength since the start of the 21st century. Drought duration indicated by CI shows longer durations in the higher-elevation region of central and western Guizhou. The corresponding drought severity is high in these regions. SPI and RDI indicate longer drought durations in the lower elevation central and eastern regions of Guizhou Province, where the corresponding drought severity is also very strong. SPI shows an increasing trend in drought duration and drought severity across most of the regions of Guizhou. In general, SPI and RDI show an increasing trend in the western Guizhou Province and a decreasing trend in central and eastern Guizhou. Comparing these three drought indices with historical records, the RDI is found to be more objective and reliable than the SPI and CI when identifying the periods of drought in Guizhou.