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http://dx.doi.org/10.3741/JKWRA.2013.46.6.613

Analysis for the Regional Characteristic of Climatic Aridity Condition in May  

Rim, Chang-Soo (Dept. of Civil Engineering, Kyonggi University)
Kim, Seong-Yeop (Dept. of Civil Engineering, Kyonggi University)
Publication Information
Journal of Korea Water Resources Association / v.46, no.6, 2013 , pp. 613-627 More about this Journal
Abstract
In this study, to understand the May aridity condition of each region for the year of the worst drought on record in each duration (1-, 3-, 6-, 12-, 24 months), monthly climate data recorded from 1973 to 2006 at 53 climatological stations in South Korea were used to estimate the FAO Penman-Monteith reference potential evapotranspiration (RET). Monthly precipitation and RET were used to estimate P/RET as aridity index and variation index (VI) of P/RET, and these indexes are compared with SPI (Standard Precipitation Index). Fifty three climatological stations were grouped into 20 regions, so that May aridity conditions of 20 regions were studied. Furthermore, regional trend of May aridity index was studied by applying Mann-Kendall trend analysis, Spearman rank test, and Sen's slope estimator. The study results show that variation index (VI) of P/RET and SPI have close correlation. Throughout the country, as the duration is shorter, May aridity was more severe. In case of 3-month and 6-month duration, most of region show significant or non-significant decreasing trend of aridity index. However, no region show significant decreasing trend of aridity index in case of 12-month and 24-month duration.
Keywords
aridity index; drought; precipitation; evapotranspiration; trend analysis;
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