Examining the Relationship between Drought Indices and Groundwater Levels

Examining the Relationship between Drought Indices and Groundwater Levels
复制标题

检查干旱指数与地下水位之间的关系

DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Oduor
P. Oduor
中科院分区：
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文献类型：
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作者：
Navaratnam Leelaruban;G. Padmanabhan;P. Oduor

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彻底描述有限水资源对气候因素的响应对于水的监测和管理是至关重要的。本研究利用美国地质调查局地下水气候响应网络井的地下水位数据，分析了选定的干旱指标与地下水位波动的关系。利用气候区划干旱指数选择了本研究所包括的干旱时段。指数包括帕尔默干旱严重程度指数、帕尔默水文干旱指数和标准化降水指数(SPI-6、9、12、24)。还使用了降雨量和平均温度。SPI-24被发现与干旱期间的地下水位相关性最好。对于32口井中的17口井，SPI-24在所有指标中显示出最好的相关性。在32口井中，有12口井的相关系数在−0.6或以上；对于其他井，相关性较好。检验了SPI-24在地下水位预测中的统计意义。对于所有研究的井，月平均地下水位与SPI-24的相关性在整个时间框架内没有太大变化。干旱的持续时间与地下水位的下降也有显著的相关性。这项研究说明了如何利用干旱指数快速评估干旱对地下水位的影响。
Thorough characterization of the response of finite water resources to climatic factors is essential for water monitoring and management. In this study, groundwater level data from U.S. Geological Survey Ground-Water Climate Response Network wells were used to analyze the relationship between selected drought indices and groundwater level fluctuation. The drought episodes included in this study were selected using climate division level drought indices. Indices included the Palmer Drought Severity Index, Palmer Hydrological Drought Index, and Standardized Precipitation Index (SPI-6, 9, 12, 24). Precipitation and the average temperature were also used. SPI-24 was found to correlate best with groundwater levels during drought. For 17 out of 32 wells, SPI-24 showed the best correlation amongst all of the indices. For 12 out of 32 wells, SPI-24 showed correlation coefficients of −0.6 or stronger; and for other wells, reasonably good correlation was demonstrated. The statistical significance of SPI-24 in predicting groundwater level was also tested. The correlation of average monthly groundwater levels with SPI-24 does not change much throughout the timeframe, for all of the studied wells. The duration of drought also had a significant correlation with the decline of groundwater levels. This study illustrates how drought indices can be used for a rapid assessment of drought impact on groundwater level.