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Çѱ¹¼öÀÚ¿øÇÐȸ / v.43, no.11, 2010³â, pp.945-956
º¹ÇÕ Á¶µµ°è¼ö »êÁ¤À» À§ÇÑ ´Ü¸é ºÐÇÒ±â¹ý °³¹ß
( Development of Subsection Division Method to Estimate a Composite Roughness Coefficient )
±èÁö¼º;±è±Ø¼ö;±è¿ø; Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏÃµÇØ¾ÈÇ׸¸¿¬±¸½Ç;Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏÃµÇØ¾ÈÇ׸¸¿¬±¸½Ç;Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ÇÏÃµÇØ¾ÈÇ׸¸¿¬±¸½Ç;
 
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½Ç¹«Àû ¸ñÀûÀ¸·Î Ⱦ¹æÇâÀ¸·Î È帧ÀúÇ× ¿ä¼Ò°¡ º¯È­ÇÏ´Â ´Ü¸é¿¡¼­´Â ´Ü¸éÀüüÀÇ ÀúÇ×À» ¹Ý¿µÇÒ ¼ö ÀÖ´Â º¹ÇÕ Á¶µµ°è¼ö¸¦ »êÁ¤ÇÔÀ¸·Î½á °³¼ö·Î Èå¸§ÇØ¼®¿¡ »ç¿ëÇϰí ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â ±âÁ¸ º¹ÇÕ Á¶µµ°è¼ö »êÁ¤½ÄÀ» °¡ÁßÄ¡ ºÎ¿©¹æ¹ý¿¡ µû¶ó ±¸ºÐÇϰí, ÃÖÀûÀÇ º¹ÇÕ Á¶µµ°è¼ö °ªÀ» »êÁ¤Çϱâ À§ÇÏ¿© °¢ ¼Ò´Ü¸é ³»¿¡¼­ ÈûÀÇ ±ÕÇüÀ» °í·ÁÇÑ ´Ü¸éºÐÇÒ±â¹ýÀ» °³¹ßÇÏ¿´´Ù. Djajadi (2009)¿Í Knight and Macdonald (1979)ÀÇ ¼ö¸®½ÇÇè¿¡ ÀÇÇÑ ½ÇÃø º¹ÇÕ Á¶µµ°è¼ö¿Í ºñ±³ÇÔÀ¸·Î½á °³¹ßµÈ ´Ü¸éºÐÇÒ±â¹ýÀÇ Á¤È®¼º°ú Ÿ´ç¼ºÀ» °ËÁõÇÏ¿´À¸¸ç, ´õºÒ¾î ±âÁ¸ 13°³ º¹ÇÕ Á¶µµ°è¼ö »êÁ¤½ÄµéÀÇ ÇÑ°è ¹× Àû¿ë¼ºÀ» ºÐ¼®ÇÏ¿´´Ù. ºÐ¼®°á°ú, ´ëÇ¥ÀûÀÎ º¹ÇÕ Á¶µµ°è¼ö »êÁ¤½ÄÀÎ Horton ¹æ¹ýÀº ´Ü¸éÀÇ Åë¼ö´ÉÀ» °ú¼ÒÆò°¡ÇÒ ¼ö ÀÖÀ¸¸ç, Lotter ¹æ¹ýÀº ½ÇÃøÄ¡¿Í Àß ÀÏÄ¡ÇÏ´Â °á°ú¸¦ Á¦°øÇÒ ¼ö ÀÖÀ¸³ª, ¼±ÇàÁ¶°ÇÀ¸·Î º» ¿¬±¸¿¡¼­ Á¦¾ÈµÈ Z-method¿¡ ±Ù°ÅÇÑ ¹æ¹ýó·³ ÀûÇÕÇÑ ´Ü¸éºÐÇÒ¹æ¹ýÀÌ »ç¿ëµÇ¾î¾ß ÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.
Practically, the composite roughness coefficient, which is the equivalent roughness coefficient of a cross-section where the wall roughness is not constant along the wetted perimeter, is used to describe the flow conditions in open channels. In this study, it was conducted that the previous formulae was classified according to a weighting factor of the local resistance. The new subsection division method was also developed based on the force-balance concept in each subsection. The accuracy of the proposed method was examined and the applicability and limitation of the 13 existing formulae were analyzed by comparing the calculated with the experimental measured data from Djajadi (2009) and Knight and Macdonald (1979). It was found that Horton's method might underestimate the total conveyance of a composite channel and Lotter's method showed a good agreement between calculated and measured data. However, the proper division method, such as the proposed method based on the Z-method, is required for the application of Lotter's method.
 
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º¹ÇÕ Á¶µµ°è¼ö;¼Ò´Ü¸é ºÐÇÒ;´Ü¸éºÐÇÒ¹æ¹ý;composite roughness coefficient;subsection division;divided-channel method;Z-method;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.43, no.11, 2010³â, pp.945-956
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201001039068355)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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