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Çѱ¹¼öÀÚ¿øÇÐȸ / v.27, no.2, 1994³â, pp.85-96
°³¼ö·Î¿¡¼­ÀÇ »ó·ù-»ç·ù õÀÌ¿µ¿ª¿¡ ´ëÇÑ ºÎÁ¤·ù ÇØ¼®
( Unsteady Flow Analysis through the Subcritical-Supercritical Transition Region )
ÇѰǿ¬;¹ÚÀçÈ«;ÀÌÁ¾ÅÂ; °æºÏ´ëÇб³ °ø°ú´ëÇÐ, Åä¸ñ°øÇаú;°æºÏ´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;°æ±â´ëÇб³ °ø°ú´ëÇÐ;
 
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ÀÚ¿¬ÇÏõÀÇ ºÎÁ¤·ù¿¡ Preissmann ±â¹ýÀ» Àû¿ë½Ã ³ªÅ¸³ª´Â ¼öÄ¡ ºÒ¾ÈÁ¤¼ºÀÇ ¿øÀÎÀ» ±Ô¸íÇÏ°í ºÒ¾ÈÁ¤¼ºÀ» ±Øº¹Çϱâ À§ÇÑ ÀûÀýÇÑ ´ëÃ¥À» Á¦½ÃÇÏ¿´´Ù. ÁÖµÈ ºÒ¾ÈÁ¤¼ºÀÇ ¿øÀÎÀ¸·Î´Â õÀÌ·ù, Çϵµ´Ü¸éÀÇ ±Þ°ÝÇÑ º¯È­, ºÎÀûÀýÇÑ Á¶µµ°è¼ö, °è»ê½Ã°£ ¹× °Å¸®°£°Ý, ±Þ°ÝÇÏ°Ô Áõ°¡ÇÏ´Â À¯ÀÔ¼ö¹®°î¼±, ±×¸®°í ¸¶¸¥ ÇÏ»ó µîÀÌ´Ù. ÀÌ·± ºÒ¾ÈÁ¤¼ºÀÇ ÁÖµÈ ¿øÀÎÀº õÀÌ·ùÀÇ ¹ß»ý°ú °ü°è°¡ ÀÖÀ¸¸ç »ó·ù-»ç·ù°¡ °øÁ¸ÇÏ´Â ÀÚ¿¬ Çϵµ¿¡¼­ õÀÌ·ù¸¦ ÇØ¼®ÇÒ ¼ö ÀÖ´Â ¸ðÇüÀ» Á¦¾ÈÇÏ¿´´Ù. °¡»óÇϵµ¸¦ ÅëÇÏ¿© ¸ðÀÇ ¼öÄ¡½ÇÇèÀ» ¼öÇàÇÑ °á°ú ÀüÇϵµ±¸°£¿¡ ´ëÇÏ¿© ¾ÈÁ¤¼ºÀÖ°Ô ¼ö·ÅÇϰí ÀÖ¾úÀ¸¸ç, Àϰü¼ºÀÖ´Â À¯·®, ¼öÀ§ÀڷḦ ¾òÀ» ¼ö ÀÖ¾ú´Ù. º» ¿¬±¸ÀÇ ¸ðÇüÀº ¾ÕÀ¸·Î ½ÇÁ¦ ÇÏõÀڷḦ ÅëÇØ Àû¿ë¼ºÀÇ °ËÁõÀÌ ÀÌ·ç¾îÁø´Ù¸é õÀÌ·ù·Î ¹ß»ýÇÏ´Â ¼öÄ¡°è»êÀÇ ¾î·Á¿òÀÇ ÇØ°á¿¡ ±â¿©ÇÒ ¼ö ÀÖ´Ù°í ÆÇ´ÜµÈ´Ù.
Numerical instability of Preissmann scheme is studied for unsteady flow analysis in a natural river. The solution strategies to overcome the instability problems are presented in this paper. The main causes of numerical instability of Preissmann scheme are transition flow, abrupt change in cross section, in-appropriate roughness coefficients, time step and distance step, rapidly rising hydrograph, dry bed and so on. Transition flow model is proposed for the analysis of the transition flow which changes from subcritical to supercritical or conversely. The subcritical and supercritical reaches are groped in the channel, then appropriate boundary conditions are introduced for each reach. The transition flow analysis produces stable solutions in calculating through the various transition conditions. Verification with an actual river system is necessary in the future.
 
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Çѱ¹¼öÀÚ¿øÇÐȸÁö / v.27, no.2, 1994³â, pp.85-96
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1738-9488
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199411920094906)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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