Establishment of hydrological drought index based on sources of regional water supply and its application to drought frequency analysis for Kunming
Establishment of hydrological drought index based on sources of regional water supply and its application to drought frequency analysis for Kunming
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DOI：
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发表时间：
2014
影响因子：
2.4
通讯作者：
Zhou Yu-lian
中科院分区：
文献类型：
--
作者：
Zhou Yu-lian
A hydrological drought composite index has been established through integrating the standardized soil water content index and standardized runoff index as the way of establishment of meteorological drought composite index,based on the analysis of the main supply sources of regional water demand inKunming city. In which,the standardized soil water content index and standardized runoff index are obtained from monthly average soil moisture and runoff respectively,and they are used to reflect crop evapotranspiration and water supply of various purposes. The threshold method is used to identify the drought processes based on hydrological drought composite index,and the drought duration is defined as the numberof time intervals in which the value of drought index is less than the threshold value of drought occurrence,Meanwhile,the drought severity is defined as the cumulative deficit below the threshold value of drought event in above-mentioned time intervals. The frequency curve fitting method is adopted to calculate frequency of each drought characteristic variable. Then with GH Copula,the joint marginal distribution of drought duration and severity is constructed and accordingly the drought recurrence interval of Kunming during 1956 to 2011 has been estimated. In comparison with actual drought circumstances and the drought pro-cesses identified through the standardized soil water content index and standardized runoff index,the re-sults show that the drought processes identified from hydrological drought composite index and the calculated recurrence interval of drought events agree well with drought processes of Kunming,the hydrological drought composite index can more directly and fully reflect the driving forces of regional drought with comparison to meteorological drought index and single hydrological drought index,such as soil water content or runoff index.
