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Çѱ¹¼öÀÚ¿øÇÐȸ / v.44, no.5, 2011³â, pp.417-427
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ħ¼ö½Ä»ý °³¼ö·Î¿¡¼ ³·ù ¹× ºÎÀ¯»ç À̵¿ Ư¼º
( Characteristics of Turbulent Flows and Suspended Sediment Transport in Open-channel with Submerged Vegetation ) |
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ħ¼ö½Ä»ý °³¼ö·Î È帧Àº±¸Á¶ÀûÀ¸·Î»óºÎ¿µ¿ª°ú½Ä»ý¿µ¿ªÀ¸·Î±¸ºÐµÇ´Âµ¥, »óºÎ¿µ¿ªÀº ÀÏ¹Ý °³¼ö·ÎÀÇ È帧Ư¼ºÀ» º¸ÀÌ¸ç ½Ä»ý¿µ¿ªÀº Áٱ⿡ ÀÇÇØ ³·ù°¡ ¾ïÁ¦µÇ¾î Á¤¼ö½Ä»ý Á¶°ÇÀÇ È帧°ú À¯»çÇÏ°Ô ´Ü¼øÇÑ È帧Ư¼ºÀ» º¸ÀδÙ. º» ³í¹®Àº ħ¼ö½Ä»ý °³¼ö·Î È帧ÀÇ ³·ù ¹× À¯»çÀ̵¿ Ư¼º¿¡ °üÇÑ ½ÇÇ迬±¸ÀÌ´Ù. À̸¦ À§ÇØ Æø 0.5m, ±æÀÌ 12mÀÎ °³¼ö·Î ½ÇÇèÀåÄ¡¸¦ ÀÌ¿ëÇÏ¿©¼ö¸®½ÇÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ´Ù¾çÇÑ À¯·®¿¡ ´ëÇÏ¿© ¼ö½Éºñ 2¢¦3ÀÎ È帧À» ±¸ÇöÇÏ¿´°í, ³ª¹«¿øÇü ½Ç¸°´õ¸¦ ÀÌ¿ëÇÏ¿© ½Ä»ýÀ» ÀçÇöÇÏ¿´´Ù. ÆòÇü»óÅ¿¡¼ ºÎÀ¯»ç ³óµµ ºÐÆ÷¸¦ ÃøÁ¤Çϱâ À§ÇؼÁß¾ÓÀÔ°æÀÌ 75 ${mu}M$ÀÎ ¸ð·¡¸¦ ÇѰèÁ¶°Ç¿¡ µµ´ÞÇϱâ±îÁö Áö¼ÓÀûÀ¸·Î ÅõÀÔÇÏ¿´´Ù. À¯¼Ó ¼ººÐÀÇ °èÃøÀ» À§ÇÏ¿© ·¹ÀÌÀú µµÇ÷¯ À¯¼Ó°è¸¦ »ç¿ëÇÏ¿´°í, Æ©ºê¸¦ ÀÌ¿ëÇÑ »çÀÌÆ÷´× ¹æ½ÄÀ¸·Î ½Ã·á¸¦ Á÷Á¢ äÃëÇÏ¿© ºÎÀ¯»ç ³óµµ¸¦ ÃøÁ¤ÇÏ¿´´Ù. ÃøÁ¤µÈ ÀڷḦ ÀÌ¿ëÇÏ¿© ½ÇÇèÁ¶°Ç¿¡ µû¸¥ Æò±ÕÈ帧°ú ³·ù·®ÀÇ Æ¯¼ºÀ» »ìÆìº¸¾Ò°í, Rouse ¼ö¿¡ µû¸¥ ºÎÀ¯»ç ³óµµ ºÐÆ÷¸¦ Á¦½ÃÇÏ¿´´Ù. |
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The open-channel flow with submerged vegetation shows distinct features in two separate regions, namely upper and vegetation layers. In the upper layer, the flow is akin to the open-channel flow, while the flow in the vegetation layer is relatively uniform with suppressed turbulence due to vegetation stems. This paper presents laboratory experiments to investigate the characteristics of turbulent flows and suspended sediment transport in open-channel flows with submerged vegetation. An open-channel facility, 0.5 m wide and 12 m long, was used for laboratory experiments. Various discharges were employed with depth ratios of 2~3, and wooden cylinders were used for vegetation. To make equilibrium suspension, sediment particles of median diameter of 75 ${mu}M$ were fed until capacity condition. Laser Doppler velocimeter was used to measure instantaneous velocity, and direct sampling with vinyl tube was used to measure the concentration of suspended sediment. Using the sampled data, the mean flow and turbulence structures were provided and characteristics of suspended sediment concentration with Rouse number were presented. |
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Ű¿öµå |
°³¼ö·Î;³·ù;ºÎÀ¯»ç;ħ¼ö½Ä»ý;¼ö¸®½ÇÇè;open-channel;turbulence;suspended sediment;submerged vegetation;hydraulic experiments; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.44, no.5, 2011³â, pp.417-427
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201118834665974)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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