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Çѱ¹¼öÀÚ¿øÇÐȸ / v.44, no.1, 2011³â, pp.65-72
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( Gradation and Transport Characteristics of Bed Materials in Pool-Riffle Sequence in the Gap Stream, Korea ) |
| ÃÖ¼º¿í;¹èÇýµæ; ¿¬¼¼´ëÇб³ Åä¸ñȯ°æ°øÇаú;¿¬¼¼´ëÇб³ ´ëÇпø Åä¸ñȯ°æ°øÇаú;
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| ÀÚ¿¬ÇÏõÀº »çÇàÀ» º¸ÀÌ¸ç ¸¸°îºÎ ¿ÜÃø¿¡ ¿õµ¢ÀÌ ±×¸®°í ¸¸°î°ú ¸¸°îÀ» ¿¬°áÇÏ´Â Á÷¼± À¯·Î¿¡ ¿©¿ïÀÌ Çü¼ºµÈ´Ù. ¿õµ¢ÀÌ´Â ¼ö½ÉÀÌ ±íÀ¸¸ç À¯¼ÓÀÌ ´À¸®°í, ¿©¿ïÀº ¼ö½ÉÀÌ ºñ±³Àû ¾è°í À¯¼ÓÀÌ ºü¸¥ Ư¡ÀÌ ÀÖ´Ù. »çÇàÀ¯·Î¸¦ µû¶ó ÀÚ¿¬ÀûÀ¸·Î ¹ß´ÞÇÏ´Â ¿õµ¢ÀÌ-¿©¿ï ¿¬¼Ó±¸Á¶¿¡ ±Ù·¡µé¾î °ü½ÉÀÌ ÁýÁߵǴ ÀÌÀ¯´Â ÀÌ·¯ÇÑ ÇÏõÇüÅÂÇÐÀû ±¸Á¶°¡ »ý¹°ÇÐÀûÀÎ ´Ù¾ç¼ºÀ» Áõ°¡½Ã۱⠶§¹®ÀÌ´Ù. º» ¿¬±¸¿¡¼´Â ±Ý°ÀÇ Áö·ùÀÎ °©Ãµ »ó·ù±¸°£À» ´ë»óÀ¸·Î ¿õµ¢ÀÌ-¿©¿ï ¿¬¼Ó±¸Á¶¿¡¼ ÇÏ»óÅäÀÇ ÀÔµµÆ¯¼ºÀ» Á¶»çÇÏ¿´´Ù. ´ë»ó±¸°£ÀÎ °©Ãµ »ó·ùºÎ´Â ÀÚ°¥ÇÏõÀ¸·Î »çÇà¿¡ ÀÇÇÑ ¿õµ¢ÀÌ 1°³¼Ò¿Í ¿©¿ï 3°³¼Ò¸¦ Æ÷ÇÔÇϰí ÀÖÀ¸¸ç, ±¸°£ »ó·ùÃø¿¡ º¸·Î ÀÎÇØ »óÇÏ·ù¿¡ Çü¼ºµÈ ¿õµ¢ÀÌ 2°³¼Ò°¡ À§Ä¡ÇÑ´Ù. ¾Æ¿ï·¯ Á¶»ç´ë»ó ±¸°£ÀÇ ½ÀÁö ¹× »û°¿¡¼ äÃëÇÑ ÇÏ»óÅäÀÇ ÀÔµµÆ¯¼ºµµ »ìÆìº¸¾Ò´Âµ¥, ¿©¿ï¿¡¼ÀÇ Áß¾ÓÀÔ°æÀÌ ¿õµ¢ÀÌ¿¡¼º¸´Ù ¾à 4¹è Å« °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ¶ÇÇÑ, Æò¼ö·® ¹× È«¼ö·®¿¡ ´ëÇÏ¿© ºÎµî·ù °è»êÀ» ½Ç½ÃÇÏ¿©, À¯»çÀ̵¿¿¡ Áß¿äÇÑ ¿õµ¢ÀÌ¿Í ¿©¿ï¿¡¼ Æò±ÕÀ¯¼Ó, Àü´ÜÀÀ·Â, ¹«Â÷¿ø Àü´ÜÀÀ·Â(Shields ¼ö), ±×¸®°í ¹«Â÷¿ø Àü´Ü¼Óµµ¸¦ °ËÅäÇÏ¿´´Ù. |
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| Natural streams meander, forming pools at the outer part of bend and riffles at the crossing. Pools are deep at a lower flow velocity, and riffles are shallow at a higher flow velocity. Attentions are being paid to pool-riffle sequences in meandering streams because pool-riffle sequences tend to increase biodiversity of the stream ecosystem. This study investigates the characteristics of distribution of bed sediment particles in the upstream reach of the Gap Stream, which is a tributary of the Geum River in Korea. The upstream part of the Gap Stream, the study reach, is a gravel-bed stream, showing a pool and three riffles due to meandering. The reach also includes pools at the upstream and downstream parts of the weir. The characteristics of bed sediment particles sampled at the wetland and in the side channel are studied, revealing that the median particle diameter in the riffle is about four times larger than that in the pool. In addition, flow simulations are carried out for ordinary discharge and design flood, and such parameters important to sediment transport as velocity, shear stress, dimensionless shear stress (or Shields number), and dimensionless shear velocity are provided to see the mobility of sediment particles in the pool-riffle sequence. |
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| Ű¿öµå |
| ¿õµ¢ÀÌ-¿©¿ï ¿¬¼Ó±¸Á¶;ÇÏ»óÅä ÀÔµµºÐÆ÷;À¯»çÀ̵¿;Àü´ÜÀÀ·Â;Shields ¼ö;°©Ãµ;pool-riffle sequence;gradation of bed sediment particles;sediment transport;shear stress;Shields number;the Gap Stream; |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.44, no.1, 2011³â, pp.65-72
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201107049668128)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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