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Çѱ¹¼öÀÚ¿øÇÐȸ / v.37, no.7, 2004³â, pp.553-567
¼öÁ¤ Ç¥Áذ­¼öÁö¼öÀÇ Á¦¾È ¹× Àû¿ë
( A Modified Standardized Precipitation Index (MSPI) and Its Application )
·ù¼Ò¶ó;À¯Ã¶»ó; Çѱ¹¼öÀÚ¿ø°ø»ç ¼öÀÚ¿ø¿¬±¸¿ø ¼öÀÚ¿ø½Ã½ºÅÛ¿¬±¸¼Ò;°í·Á´ëÇб³ °ø°ú´ëÇÐ »çȸȯ°æ½Ã½ºÅÛ°øÇаú;
 
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º» ¿¬±¸¿¡¼­´Â SPIÀÇ ¹®Á¦Á¡À» º¸¿ÏÇÏ´Â Ãø¸é¿¡¼­ ¼öÁ¤ SPI(MSPI)¸¦ Á¦¾ÈÇϰí, À̸¦ ¼­¿ïÁöÁ¡ÀÇ °¡¹°ºÐ¼®¿¡ Àû¿ëÇÏ¿© ºñ±³ÇÏ¿´´Ù. MSPI´Â °­¼ö·®À» À̵¿Æò±ÕÇϱâ Àü¿¡ Á¤±ÔÈ­ ÇÏ´Â °úÁ¤À» Ãß°¡ÇÏ´Â °æ¿ì·Î SPI°¡ °­¼öÀÇ Àý´ë·®À» ÀÌ¿ùÇÏ´Â ¹Ý¸é MSPI´Â °­¼öÀÇ »ó´ë·®À» ÀÌ¿ùÇÏ´Â ÇüŸ¦ °¡Áö°Ô µÈ´Ù. ¼­¿ïÁöÁ¡ ¿ù°­¼ö·®ÀÚ·á´Â 1777³â-1996³â±îÁöÀÇ °ÍÀ¸·Î °¢°¢ ÀüüÀÚ·á ¹× 1900³âÀ» ÀüÈÄ·Î ÇÑ Àå±â°ÇÁ¶±âÀÇ Àü¹ÝºÎ ¹× ÈĹݺθ¦ µû·Î ºÐ¼®ÇÏ¿© ºñ±³µÉ ¼ö ÀÖµµ·Ï ÇÏ¿´´Ù. ±× °á°ú¸¦ Á¤¸®ÇÏ¸é ´ÙÀ½°ú °°´Ù. (1) MSPI°¡ SPI¿¡ ºñÇØ º¸´Ù Çö½ÇÀûÀÎ °á°ú¸¦ ÁØ´Ù. ÀÌ´Â 1900³âµµ ÀüÈÄ·ÎÀÇ Àå±â°ÇÁ¶±â°¡ Æ÷ÇÔµÈ ±â·Ï°ú Æ÷ÇÔµÇÁö ¾ÊÀº ±â·ÏÀ» ºÐ¼®ÇÑ °á°úÀÇ ºñ±³¿¡¼­ È®ÀεǾú´Ù. (2) MSPI´Â SPI¿¡ ºñÇØ ±Ø´ÜÀûÀÎ °­¼ö»ç»ó¿¡ ´ú ¹Î°¨ÇÑ °á°ú¸¦ ÁØ´Ù. Àå±â°ÇÁ¶±âÀÇ Àü¹ÝºÎ ¹× ÈĹݺο¡ ´ëÇØ MSPI¸¦ Àû¿ëÇÑ °á°ú¸¦ ºñ±³ÇÏ¸é °¡¹³ÀÇ ¹ß»ý°¡´É¼ºÀº º¸Åë °¡¹³ÀÇ °æ¿ì´Â ´ëü·Î ºñ½ÁÇϳª ¾ÆÁÖ ½ÉÇÑ °¡¹³ÀÇ °æ¿ì´Â ¾à°£ ÁÙ¾îµé¾úÀ½À» ÆÄ¾ÇÇÒ ¼ö ÀÖ´Ù(ÀçÇö±â°£ ¾à 18³â¿¡¼­ 16³âÀ¸·Î). ±×·¯³ª °¡¹³ ¹ß»ý ½Ã ±× Áö¼Ó±â°£Àº Àü¹ÝºÎ¿¡ ºñÇØ ÈĹݺΰ¡ ±æ°Ô ³ªÅ¸³ª°í ÀÖ´Ù(¾ÆÁÖ ½ÉÇÑ °¡¹³ÀÇ °æ¿ì ¾à 2°³¿ù¿¡¼­ 2.5°³¿ù·Î). ÀÌ·¯ÇÑ °á°ú´Â »ó´ëÀûÀ¸·Î ±Ø´ÜÀûÀÎ °á°ú·Î ³ªÅ¸³»´Â SPI(¾ÆÁÖ ½ÉÇÑ °¡¹³ÀÇ °æ¿ì ÀçÇö±â°£Àº ¾à 25³â¿¡¼­ 10³âÀ¸·Î, Áö¼Ó±â°£Àº 1.5°³¿ù¿¡¼­ 3.5°³¿ù·Î)¿¡ ºñÇØ º¸´Ù Çö½ÇÀûÀ̶ó°í ÆÇ´ÜÇÒ ¼ö ÀÖ´Ù.
This study proposes a modified standardized precipitation index (MSPI) which was developed to make up for the weakness of the SPI. Both MSPI and SPI are applied to the monthly rainfall at the Seoul station for the drought analysis. The MSPI proposed is nothing but the SPI for the normalized monthly rainfall, that is, an extra step for normalizing the monthly rainfall is included before driving the SPI. Thus, the MSPI has a structure to transfer the relative amount of rainfall to the next months, but the SPI the absolute amount of rainfall. The monthly rainfall data at the Seoul station used in this study are those collected from 1777 to 1996. The rainfall data collected before and after the long dry period around 1900 were also analyzed separately for the comparison. The results derived are as follows. (1) The MSPI was found to be more practical compared to the SPI. This was assured by comparing the analysis results of the data including and excluding the long dry period around 1900. (2) The MSPI is found to be less sensitive than the SPI to the extreme rainfall events. For the MSPI, the occurrence probabilities of moderate drought before and after the long dry period are similar, but those for the extreme drought becomes slightly decreased after the long dry period (from about 18 years of return period before the long dry period to the 16 years after the long dry period). However, the duration becomes longer after the long dry period (the duration for the extreme drought has been increased from 2 to 2.5 months after the long dry period). This results can also be compared with a rather unreasonable result derived by applying the SPI (for the extreme drought the return period has been decreased to be from 25 to 10 years after the long dry period, on the other hand the duration has been increased from 1.5 months to 3.5 months). So, we man conclude that the MSPI is more practical for the drought analysis that the SPI.
 
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Ç¥Áذ­¼öÁö¼ö;¼öÁ¤Ç¥Áذ­¼öÁö¼ö;°¡¹³;ÀçÇöƯ¼º;Áö¼ÓƯ¼º;Standardized Precipitation Index;MSPI;Drought;Return Period;Duration;Poisson Process;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.37, no.7, 2004³â, pp.553-567
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200411922379245)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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