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Çѱ¹¼öÀÚ¿øÇÐȸ / v.40, no.4, 2007³â, pp.335-343
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( Evaluation of Droughts in Seoul Using Two-Dimensional Drought Frequency Analysis ) |
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Drought characteristics need to be preceded before establishing a drought mitigation plan. In this study, using a Standardized Precipitation Index (SPI), a hydrologic drought was defined as an event during which the SPIs are continuously below a certain truncation level. Then, a methodology of drought frequency analysis was performed to quantitatively characterize droughts considering drought duration and severity simultaneously. The theory of runs was used to model drought recurrence and to determine drought properties like duration and severity. Short historical records usually do not allow reliable bivariate analyses. However, more than hundred years of precipitation data (1770 ${sim}$ 1907) collected in Chosun Kingdom Age using an old Korean rain gage called Chukwooki can provide valuable information about past events. It is shown that a bivariate gamma distribution well represented the joint probabilistic properties of Korean drought duration and severity. The overall results of this study show that the proposed bivariate drought frequency analysis overcomes the drawbacks of the conventional univariate frequency analysis by providing a consistent representation of the drought recurrent property. |
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°¡¹³;Ç¥Áذ¼öÁö¼ö;Ãø¿ì±â ÀÚ·á;°¡¹³ÀÇ ÀçÇöƯ¼º;Drought;Standardized Precipitation Index;Chukwooki;Recurrence; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.40, no.4, 2007³â, pp.335-343
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200727543088234)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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