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Çѱ¹¼öÀÚ¿øÇÐȸ / v.33, no.2, 2000³â, pp.181-193
ÆÄ¶ûÁ¸Àç½Ã ÇØÀú ¸ð·¡°áÀ§ÀÇ ºÎÀ¯»ç ³óµµºÐÆ÷
( Suspended Sediment Concentrations over Ripples for Waves )
±èÈ¿¼·;±èÅÂÇü; ±¹¹Î´ëÇб³ °ø°ú´ëÇÐ Åä¸ñ¡¤È¯°æ°øÇкÎ;±¹¹Î´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;
 
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º» ³í¹®¿¡¼­´Â ÆÄ¶ûÀÌ Á¸ÀçÇÒ ¶§ ¸ð·¡°áÀ§¿¡¼­ÀÇ È帧°ú ºÎÀ¯»çÀÇ °Åµ¿¿¡ °üÇÏ¿© ±â¼úÇÑ´Ù. »õ·Î¿î ¼öÄ¡¸ðÇü½Ã½ºÅÛÀ» ±¸ÃàÇÏ¿´À¸¸ç À̸¦ ±ÔÄ¢ÆÄ¶ûÀ» ÀÌ¿ëÇÑ ±âÁ¸ ½ÇÇè½Ç ½ÇÇèÁ¶°Ç°ú °¡»óÀûºÒ±ÔÄ¢ÆÄ¶ûÁ¶°Ç¿¡ Àû¿ëÇÏ¿´´Ù. È帧Àå °è»êÀº SMAC ¹æ¹ý¿¡ ±Ù°ÅÇÑ ÇÁ·Î±×·¥ SOLA¸¦ Kim µî(1994)ÀÌ ÀϺΠ¼öÁ¤ÇÏ¿© Á¦½ÃÇÑ ÇÁ·Î±×·¥À» »ç¿ëÇÏ¿´´Ù. È帧°è»ê ºÎ¸ðÇüÀº x-z ¸é¿¡¼­ÀÇ ¿¬¼Ó¹æÁ¤½Ä°ú ReynoldsÀÇ ¿îµ¿¹æÁ¤½ÄÀ» ±âº»¹æÁ¤½ÄÀ¸·Î ÇÑ´Ù. È帧ºÎ¸ðÇüÀ¸·Î ÆÄ¶û±ËÀûµµ, Àü´ÜÀÀ·Â, ¾Ð·ÂÀÇ ºÐÆ÷¸¦ °è»êÇÏ¿´´Ù. ¸ðÇü½ÇÇè°á°ú Áß ¼öÁ÷¹æÇâ±ËÀûµµ´Â °üÃøÀÚ·á¿Í Àß ÀÏÄ¡ÇÏ¿´´Ù. ÅðÀû¹°À̵¿ ºÎ¸ðÇüÀº ºÎÀ¯»çÀÇ ÀÌ·ùÈ®»êÀ» ³ªÅ¸³»´Â ½ÄÀ» ±âº»¹æÁ¤½ÄÀ¸·Î ÇÑ´Ù. ¼öÄ¡±â¹ýÀº ºÐ¸®±â¹ýÀ» ÀÌ¿ëÇϸç, ¸ð·¡°á Ç¥¸éÀ¸·ÎºÎÅÍ ÅðÀû¹°ÀÌ ¿¬ÇàµÇ¾î À¯Ã¼³»·Î ÅõÀԵȴÙ. ±ÔÄ¢ÆÄ¶û ½ÇÇèÁ¶°Ç¿¡ ¼öÄ¡¸ðÇüÀ» Àû¿ëÇÑ °á°ú, ºÎÀ¯»ç³óµµÀÇ ¿¬Á÷ºÐÆ÷°¡ DeltaflumeÀÇ ½ÇÇèÀÚ·á¿Í À¯»çÇÏ°Ô ÀçÇöµÇ¾ú´Ù. °¡»óÀûÀÎ ºÒ±ÔÄ¢ ÆÄ¶ûÁ¶°Ç¿¡ ¸ðÇüÀ» Àû¿ëÇÑ °á°ú ºÎÀ¯»ç³óµµÀÇ ³ô°Ô, ºÎÀ¯»çÈ®»ê ¹üÀ§°¡ ´õ ³Ð°Ô ¿¹ÃøµÇ¾ú´Ù.
This paper presents the flow and the suspended sediment movement over ripples for oscillatory flows. A new numerical model system is developed, and applied to a laboratory experimental condition of regular waves and a fictitious condition of irregular waves. The flow field is obtained from a programme proposed by Kim et. al.(1994), which is a modified version of SOLA based on SMAC scheme. The sub-model solves the continuity and Reynolds momentum equations in the x-z plane. The wave orbital velocities, shear stresses, and pressure are all reasonably reproduced by the model. The model results on the vertical velocity component show good agreement with the measurements. The suspended sediment transport sub-model is newly set up to solve the advection-diffusion equation of suspended sediment using a split method, and involving a special shear entrainment from the whole ripple surface. The calculated suspended sediment concentrations for regular waves show reasonable agreement with measurements at Deltaflume. The model results for random waves show that the suspended sediment concentration is higher than those for regular waves and that the sediment diffuses higher than for regular waves with the significant wave height and the peak wave period of the irregular waves.
 
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ºÎÀ¯»ç³óµµ;ÆÄ¶û;¼öÄ¡¸ðÇü;suspended sediment concentration;wave;numerical model;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.33, no.2, 2000³â, pp.181-193
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200011920063594)
¾ð¾î : ¿µ¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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