| 王玺圳,粟晓玲,张更喜.综合干旱指数的构建及其在泾惠渠灌区的应用[J].干旱地区农业研究,2019,37(4):223~230 |
| 综合干旱指数的构建及其在泾惠渠灌区的应用 |
| 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 |
| 中文关键词: SPEI NDVI SSI SGI 综合干旱指数 CRITIC客观赋权法 泾惠渠灌区 |
| 英文关键词:SPEI NDVI SSI SGI Comprehensive drought index CRITIC objective weighting method Jinghui irrigation area |
| 基金项目:国家自然科学基金项目(51879222) |
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| 中文摘要: |
| 基于标准化降水蒸散发指数(SPEI)、归一化植被指数(NDVI)、标准化土壤含水量指数(SSI)和标准化地下水指数(SGI)4个反映地区农业干旱的指数，利用CRITIC客观赋权法构建了综合干旱指数(CDI)，以泾惠渠灌区为研究区，计算综合干旱指数，并与改进的帕默尔干旱指数（sc-PDSI）进行相关性分析评价其适用性，采用Mann-Kendall检验法分析了泾惠渠灌区2002-2013年农业干旱的发展趋势。结果表明：构建的综合干旱指数(CDI)与自适应帕默尔干旱指数(sc-PDSI)具有强相关性，皮尔逊相关系数为0.73，CDI与sc-PDSI在对旱情监测结果上相关性显著，两者在时间演进上趋势整体相同，说明综合干旱指数(CDI)可以较为准确地反映研究区的干旱情况，在研究区适用性较强。利用综合干旱指数(CDI)对泾惠渠灌区的干旱特性进行了分析，月际间分析发现泾惠渠灌区在4、6月和11月较容易发生干旱，而2月和8月灌区较为湿润，季节间分析发现灌区在2003年发生了严重的春旱，2002年发生了严重的夏旱和秋旱，2009年发生了严重的冬旱。年际间分析发现泾惠渠灌区的CDI值在2002—2013年间大约以0.032·a-1的速度波动上升，说明研究区干旱有缓解趋势。利用Mann-Kendall突变检验法分析出泾惠渠灌区的旱情在2011年7月发生了显著突变，CDI趋势由降低转为增加，表明研究区在此时间点后呈湿润化趋势。 |
| 英文摘要: |
| 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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