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Çѱ¹¼öÀÚ¿øÇÐȸ / v.38, no.11, 2005³â, pp.917-925
Ç¥¸éÀ¯¼ÓÀ» ÀÌ¿ëÇÑ Æò±ÕÀ¯¼Ó ÃßÁ¤¹æ¹ýÀÇ °³¹ß
( Estimatation of Mean Velocity from Surface Velocity )
³ë¿µ½Å;À±º´¸¸;·ù±Ç±Ô; Çѱ¹°Ç¼³±â¼ú¿¬±¸¿ø ¼öÀÚ¿ø¿¬±¸ºÎ;¸íÁö´ëÇб³ Åä¸ñȯ°æ°øÇаú;¸íÁö´ëÇб³ Åä¸ñȯ°æ°øÇаú;
 
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LSIVÀº Ç¥¸éÀ¯¼ÓÀ» ÃøÁ¤ÇÏ´Â ¿µ»ó±â¹Ý À¯¼ÓÃøÁ¤¹ýÁßÀÇ ÇϳªÀÌ´Ù. ÀÌ ¹æ¹ýÀº ±âÁ¸ ÃøÁ¤±â¹ý¿¡ ºñÇØ ÃøÁ¤ÀÌ ¿ëÀÌÇÒ »Ó¸¸ ¾Æ´Ï¶ó °æÁ¦ÀûÀ̱⠶§¹®¿¡ À¯·®ÃøÁ¤ µîÀÇ ½ÇÁ¦ ÇÏõÀÇ À¯¼Ó ÃøÁ¤¿¡ Ȱ¿ëÇÏ·Á´Â ¿¬±¸µéÀÌ ½ÃµµµÇ°í ÀÖ´Ù. ±×·¯³ª ÀÌ ±â¹ýÀº Ç¥¸éÀ¯¼ÓÀ» ÃøÁ¤Çϱ⠶§¹®¿¡ À¯·® »êÁ¤À» À§Çؼ­´Â ÃøÁ¤µÈ Ç¥¸éÀ¯¼ÓÀ» Æò±ÕÀ¯¼ÓÀ¸·Î ȯ»êÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀÌ ÇÊ¿äÇÏ´Ù. º» ¿¬±¸¿¡¼­´Â ÇÏ»ó ¹× È帧Á¶°Ç¿¡ ´ëÇÑ ´Ù¾çÇÑ ¼ö¸®½ÇÇèÀ» ÅëÇØ °³¼ö·Î ³­·ù È帧¿¡ ´ëÇÑ ¿¬Á÷À¯¼ÓºÐÆ÷ÀÇ Æ¯¼ºÀ» ÆÄ¾ÇÇÏ¿´´Ù. ¼ö¸®½ÇÇè°á°ú ¼öÇ¥¸é ¿µ¿ªÀÇ À¯¼Ó°¨¼Ò¸¦ È®ÀÎÇÏ¿´À¸¸ç, ÀÌ·¯ÇÑ À¯¼Ó°¨¼Ò´Â Á¶µµº¸´Ù´Â Froude ¼öÀÇ ¿µÇâÀÌ ´õ Å« °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ½ÇÇè °á°ú¸¦ ÀÌ¿ëÇÏ¿© Ç¥¸éÀ¯¼ÓÀ¸·ÎºÎÅÍ Æò±ÕÀ¯¼ÓÀ» ÃßÁ¤ÇÏ´Â µÎ °¡Áö ¹æ¹ýÀ» Á¦½ÃÇÏ¿´´Ù. Á¦¾ÈµÈ ¹æ¹ýµéÀº Ç¥¸éÀ¯¼Ó º¸Á¤·®À» ÀÌ¿ëÇÏ¿© ÈÄ·ù¹ýÄ¢ÀÇ À¯¼ÓºÐÆ÷¸¦ º¸Á¤ÇÏ´Â ¹æ¹ý°ú Æò±ÕÀ¯¼Ó°ú Ç¥¸éÀ¯¼ÓÀÇ ºñ¸¦ ÀÌ¿ëÇÑ ¹æ¹ýÀÌ´Ù. Á¦½ÃµÈ ¹æ¹ýµéÀº ½ÇÁ¦ ÇÏõÀÇ À¯¼Ó ÃøÁ¤ ÀÚ·áµéÀ» ÀÌ¿ëÇÏ¿© °ËÁõÇÏ¿´´Ù °ËÁõ°á°ú ÀÌ ¹æ¹ýµéÀº $6%$ À̳»ÀÇ ¿ÀÂ÷¸¦ º¸ÀÌ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
LSIV (Large Scale Image Velcocimetry) Is one of the image-based velocity measurement techniques. Since it measures surface velocities, it gives simple and inexpensive way to measure velocity, compared to other methods. Because of these advantages, there have been many studies to apply LSIV to the river discharge measurement in the field. Measuring the discharge by using LSIV requires a method which converts a surface velocity to a mean velocity In the present study, experiments and analysis of vortical velocity profile of open-channel flow in various conditions were performed to develop methods which estimate a mean velocity from a surface velocity. The result of this experiment reveals that velocity-dip phenomena occur at free-surface layer in open channel flow and Froude number affects more than bed roughness does. Two methods for estimating the mean velocity were proposed. One is to correct the wake law's profiles by using the difference of surface velocity from the mean velocity, and the other is to use the ratio of mean and surface velocities. The result of applying these methods in an experiment shows that they are quite accurate having an error of approximately $6%$ only.
 
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Ç¥¸éÀ¯¼Ó;Æò±ÕÀ¯¼Ó;À¯¼Ó°¨¼ÒÇö»ó;LSIV;surface velocity;mean velocity;velocity-dip phenomena;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.38, no.11, 2005³â, pp.917-925
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200507523360655)
¾ð¾î : Çѱ¹¾î
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