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Çѱ¹¼öÀÚ¿øÇÐȸ / v.36, no.3, 2003³â, pp.507-520
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VÇü ¿©¿ï¿¡¼ ¹ß»ýÇÏ´Â ¼¼±¼¿¡ °üÇÑ ½ÇÇè ¿¬±¸
( An Experimental Study on Scour at V-shaped Riffle ) |
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| VÇü ¿©¿ïÀº ÇÏõ ¾ç¾È¿¡ ¼³Ä¡ÇÏ¿© ¿©¿ïÀÇ °¡¿îµ¥·Î ¹°ÀÇ È帧À» ÁýÁß½ÃÄÑ Çϵµ Áß¾Ó Á÷ÇÏ·ù¿¡ ¼¼±¼·Î ÀÎÇÑ ¼Ò(pool)¸¦ Çü¼ºÇÏ´Â ¿ªÇÒÀ» ÇÏ´Â Àΰø ¿©¿ïÀÌ´Ù. VÇü ¿©¿ïÀÇ ¼³Ä¡ ¸ñÀûÀº ÆòÅºÈµÈ Çϵµ¿¡ ¼Ò¸¦ Çü¼º½ÃÄÑ °¥¼ö½Ã ¾î·ùÀÇ ¼½Äó ³ë´Â Çdzó¸¦ Á¦°øÇϰí, È«¼ö½Ã¿¡´Â À¯¼ÓÀÌ ¾àÇÑ ±¸°£À» ¹ß»ý½ÃÄÑ ¾î·ùÀÇ Çdzó¸¦ Á¦°øÇÏ´Â °ÍÀÌ´Ù. º» ¿¬±¸¿¡¼´Â VÇü ¿©¿ïÀÇ ¼ö¸® ¸ðÇü ½ÇÇèÀ» ½Ç½ÃÇÏ¿© °¢ Á¶°Ç¿¡ µû¸¥ ¼¼±¼½ÉÀ» ÃøÁ¤ÇÏ¿© ¼¼±¼ Ư¼ºÀ» ºÐ¼®ÇÏ¿´°í, ³ª¾Æ°¡ ¼ö¸®·® Á¶°Ç ¹× VÇü ¿©¿ï ÇüÅÂ¿Í ¼¼±¼ °£ÀÇ Á¤·®ÀûÀÎ °ü°è¸¦ ½ÇÇè °á°ú·ÎºÎÅÍ µµÃâÇÏ¿´´Ù. ¶ÇÇÑ VÇü ¿©¿ï°ú ÇüŰ¡ À¯»çÇÑ ¼öÁ¦¿¡¼ÀÇ ¼¼±¼½É¿¡ ´ëÇÑ ±âÁ¸ÀÇ ¿¬±¸ °á°ú¿Í VÇü ¿©¿ïÀÇ °æ¿ì¸¦ ºñ±³ÇÏ¿´´Ù. ±× °á°ú Breusers¿Í Raudkivi(1991)°¡ Á¦¾ÈÇÑ ¼öÁ¦¿¡¼ÀÇ ¼¼±¼½É ¿¹Ãø½ÄÀº VÇü ¿©¿ï¿¡¼ÀÇ ¼¼±¼½ÉÀ» °ú¼ÒÆò°¡ÇÏÁö¸¸ VÇü ¿©¿ï²²¼ÀÇ ¼¼±¼ Ư¼ºÀ» ÀϺΠ¹Ý¿µÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. VÇü ¿©¿ïÀÇ ¼¼±¼¿¡ ¿µÇâÀ» ÁÖ´Â ÀÎÀÚµéÀÇ ¹«Â÷¿øÈ¸¦ ÅëÇØ VÇü ¿©¿ï¿¡¼ÀÇ ¼¼±¼½É ¿¹Ãø½ÄÀ» Á¦¾ÈÇÏ¿´°í Á¦¾ÈµÈ ¿¹Ãø½ÄÀº VÇü ¿©¿ïÀÇ Àû¿ë¿¡ ÀÖ¾î¼ ¼¼±¼½ÉÀ» ÃßÁ¤Çϴµ¥ »ç¿ëµÉ ¼ö ÀÖ°í ÆÇ´ÜµÈ´Ù. VÇü ¿©¿ïÀÇ ¼¼±¼¿¡ Áö¹èÀûÀÎ ¿µÇâÀ» ÁÖ´Â ÀÎÀÚ´Â ¿©¿ï Áß¾Ó¿¡¼ÀÇ ÇÁ·çµå ¼öÀ̰í, ±×¹Û¿¡ ¿©¿ï°ú È帧ÀÇ °¢µµ¿Í ¿©¿ï °³±¸ºÎÀÇ Æøµµ ºÎºÐÀûÀ¸·Î ¿µÇâÀ» ÁØ´Ù. |
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| A V-shaped riffle is an artificial hydraulic structure haying two wings from the streamside with a narrow opening in between. It is usually made of crushed stones or large boulders. It limits channel width and accelerates the flow through the constricted section causing a local scour just downstream. The V-shaped riffle provides with a unique aquatic habitat by forming a pool and sandbars around the pool edge, increasing local morphologic, hydraulic and sedimentological diversity. This study investigates experimentally the scour characteristics of the V-shaped riffle in the sandbed stream and proposes a predictive equation for the scour. Total 45 cases of experiments were conducted to examine the effect of hydraulic factors and configuration of V-shaped riffle on the geometry of scour holes. From the comparison of the experimental results of this study with the predictive equation of spur dike by Breusers and Raudkivi(1991), it is found that their predictive equation of spur dike underestimates the maximum scour depth downstream of the V-shaped riffle. h new predictive equation for the maximum scour depth was developed using the non-dimensional hydraulic and geometrical variables. The parameters used in the proposed equations were determined using the experimental data. The analysis reveals that the scour depth is dependent dominantly on the Froude number at the opening of the V-shaped riffle, while the angle of riffle and the opening width also affect the scour depth. The proposed equation for the scour of V-shaped riffle well agrees with the experimental data. It can be used for estimating the scour of the V-shaped riffle in sandbed streams. |
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| Ű¿öµå |
| ¼¼±¼;VÇü ¿©¿ï;¼öÁ¦;¼ö»ý ¼¼®Ã³;¼¼±¼ ½ÇÇè;scour;V-shaped riffle;spur dike;aquatic habitat;scour experiment; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.36, no.3, 2003³â, pp.507-520
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200302612608347)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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