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Çѱ¹ÇÏõȣ¼öÇÐȸ / v.33, no.3, 2000³â, pp.213-221
ÇÏÀý±â À帶µ¿¾È ¿ëÁ¸»ê¼ÒÀÇ ¿ªµ¿Àû º¯È­
( Dynamic Changes of Dissolved Oxygen during Summer Monsoon )
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º» ¿¬±¸´Â 1993³âºÎÅÍ 1994³â±îÁö ´ëûȣÀÇ 17°³ ÁöÁ¡¿¡¼­ °èÀýÀû »ê¼Ò³óµµ ¹× ½ÉÃþ »ê¼Ò °áÇÌÀ²À» Á¶»çÇÏ¿´´Ù. 1993³â º»·ù·ÎºÎÅÍÀÇ À¯ÀÔ¼ö´Â 7${sim}$8¿ùÀÇ À帶ö¿¡ Ãִ븦 º¸¿´À¸¸ç, ÀÌ´Â »ó·ùÀÇ ¼ö¿Â ¼ºÃþ ¹× ¹«»ê¼ÒÃþÀ» ÆÄ±«ÇÏ¿©, ½ÉÃþ ¹«»ê¼Ò´ë´Â È£¼ö Áß ÇÏ·ù¿ª¿¡ Á¦ÇѵǾú´Ù. ÀÌ ±â°£µ¿¾È ¹«»ê¼ÒÃæÀº È£¼öÀüü ºÎÇÇÀÇ 10%ÀÌÇÏ¿¡ ºÒ°úÇÏ¿´´Ù. ¹Ý¸é, 1994³â ÇÏÀý±â¿¡ ¹«»ê¼ÒÃæÀº È£¼öÀü¿ª¿¡ °ÉÃÄ ºÐÆ÷ÇÏ¿´°í, »ê¼ÒÆ÷È­µµ´Â 30% ÀÌÇϸ¦ À¯ÁöÇÏ¿´À¸¸ç, ¹«»ê¼Ò´ëÀÇ Ã¼ÀûÀº ¼öü ÃѺÎÇÇÀÇ 85%¸¦ Â÷ÁöÇÏ¿´´Ù. È£¼ö³» »ê¼ÒÀÇ ±Þ°ÝÇÑ °¨¼Ò´Â ³Ã¼ö¼º ¾îÁ¾(ºù¾î)ÀÇ ´ë·®Æó»ç¸¦ ¾ß±â½ÃÄ×´Ù. ÇÏÀý±âµ¿¾È »ó´ëÀû »ê¼Ò°áÇ̵µ(Relative Areal Oxygen Deficit, RAOD)´Â 1993³â¿¡ $-0.024;mg;O_2;cm^{-2};d^{-1}$·Î »ê¼ÒÇÔ·®ÀÌ Áõ°¡ÇÑ ¹Ý¸é, 1994³â¿¡´Â $-0.080;mg;O_2;cm^{-2};d^{-1}$·Î¼­ »ê¼ÒÀÇ ºü¸¥ °¨¼ÒÀ²À» º¸¿´´Ù. °è»êµÈ ¹«»ê¼Òµµ(Anoxic Factor, AF)´Â RAOD¿Í µ¿ÀÏ ÆäÅÏÀ» º¸¿´À¸¸ç, 1993º¸´Ù 1994³â¿¡ 50 d ÀÌ»ó Áõ°¡¸¦ º¸¿´´Ù. ¼ö½Éº° Æò±Õ ¿©¸§ »ê¼Ò³óµµÀÇ °è»ê¿¡ µû¸£¸é, 1993³âÀÇ °æ¿ì ´ëºÎºÐÁöÁ¡¿¡¼­ °­(River)ÀÇ Æ¯¼º ($6{sim}11;mg/l;DO$)À» º¸ÀÎ ¹Ý¸é, 1994¿¡´Â ¼öü Àü¿ª¿¡¼­ ÀüÇüÀûÀΠȣ¼öƯ¼º (<4mg/l DO)À» º¸¿´´Ù. À¯ÀÔ·®¿¡ ´ëÇÑ ¿ëÁ¸»ê¼ÒÀÇ È¸±âºÐ¼®¿¡ µû¸£¸é, »ê¼Ò º¯È­´Â À帶öÀ¯ÀÔ·®ÀÇ Å©±â¿¡ ÀÇÇØ °áÁ¤µÇ¾ú´Ù($R^2;=;0.99$). ÀÌ·± °á°ú´Â ´ëûȣ¿¡¼­ ÇÏÀý±â ¿ëÁ¸»ê¼Ò¸¦ Á¶ÀýÇÏ´Â 1Â÷Àû ¿äÀÎÀÌ ÇÏÀý±â °­¿ìÀÇ °­µµ¶ó´Â »ç½ÇÀ» Á¦½ÃÇÑ´Ù.
Seasonal oxygen content and deficit rates were evaluated from 17 sites of Taechung Reservoir during 1993${sim}$1994. In 1993, river inflows peaked during the monsoon in July${sim}$August and disrupted thermal stratification and anoxic layers in the headwaters, thereby confining the anoxia to the mid-lake and downlake reach. The volume of anoxic water with < 4 mg/l DO comprised only < 10% of the total lake volume in this period. In contrast, during monsoon 1994, 85% of total lake volume was subject to hypoxic conditions with oxygen concentrations < 30% saturation, resulting in massive fishkills (Hypomesus olidus). Relative areal oxygen deficit (RAOD) was -0.024mg O$_{2}$cm$^{-2}$d$^{-1}$ during monsoon 1993, whereas it rapidly decreased at the rate of 0.080mg O$_{2}$cm$^{-2}$d$^{-1}$ during monsoon 1994. Anoxic factor (AF) showed a same interannual pattern as the RAOD and was greater >50 d in 1994 (76.5 d) than 1993 (21.3 d). Thus, the reservoir showed a river-characteristics (6${sim}$11 mg/l DO) in 1993 while lacustrine conditions (<4mg/l DO) dominated in 1994. Regression analysis showed that the variation of summer DO was mostly determined (R$^{2}$=0.99, p<0.0001) by inflow. These findings suggest that the primary factor regulating the oxygen content in this system during summer is an intensity of the monsoon rain.
 
Ű¿öµå
Monsoon;Oxygen;Hypoxia;Anoxia;Reservoir;Korea;
 
Çѱ¹ÇÏõȣ¼öÇÐȸÁö / v.33, no.3, 2000³â, pp.213-221
Çѱ¹ÇÏõȣ¼öÇÐȸ
ISSN : 1976-8087
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200018317175954)
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