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Çѱ¹¼öÀÚ¿øÇÐȸ / v.22, no.2, 1989³â, pp.191-200
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( A Study on the Bed-Load Transport Rate ) |
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| ¼Ò·ù»çÀÇ ÀÔÀÚÀ̵¿¼Óµµ¿Í ¼Ò·ù»ç³óµµÀÇ °öÀ¸·Î ¼Ò·ù»ç·®À» °è»êÇÒ ¼ö ÀÖ´Â ÇÑ ¹æ¹ýÀÌ Á¦½ÃµÇ¾ú´Ù. º» ¿¬±¸¿¡¼ »ç¸³ÀÇ Æò±ÕÀ̵¿¼Óµµ´Â ÇÏ»óºÎ±ÙÀÇ À¯¼Ó³·ù¼ººÐÀÇ ÃâÇöºóµµ°¡ Á¤±ÔºÐÆ÷ ÇÑ´Ù°í °¡Á¤Çϰí, ÀÔÀÚÀ̵¿¼Óµµ¸¦ ¼Ò·ù·ÂÀÇ ÇÔ¼ö¿Í ÇÏ»óºÎ±ÙÀÇ Æò±ÕÀ¯¼ÓÀÇ °öÀ¸·Î ³ªÅ¸³»¾ú´Ù. ¼Ò·ù»ç¿¡ À¯È¿ÇÏ°Ô ÀÛ¿ëÇÏ´Â ¼Ò·ù·ÂÀ» ±¸Çϱâ À§Çؼ Engelund°¡ Á¦½ÃÇÑ ½ÄÀ» »ç¿ëÇÏ¿© À¯È¿¸¶Âû¼Óµµ¸¦ ±¸ÇÏ¿´À¸¸ç Engelund°¡ Á¦½ÃÇÑ ½ÄÀÇ ÀûÇÕ¼ºÀ» °£Á¢ÀûÀ¸·Î °ËÁõÇß´Ù. ¼Ò·ù»ç³óµµ¸¦ ±¸Çϱâ À§Çؼ È£Àü¡¤µµ»óÀÇ ½ÄÀ» »ç¿ëÇÏ¿´´Ù. ½ÇÇèÀÚ·á´Â Ÿ ¿¬±¸ÀÚµéÀÇ ½Ä°ú ºñ±³µÇ¾úÀ¸¸ç Ÿ ¿¬±¸ÀÚµéÀÇ ½Ä°ú ºñ½ÁÇÑ °æÇâÀ» ³ªÅ¸³»¾ú´Ù. ¼Ò·ù·ÂÀÌ ºñ±³Àû ÀÛÀº °æ¿ì¸¦ Á¦¿ÜÇϰí Á¦½ÃµÈ ½Ä¿¡¼ °è»êµÈ °á°ú¿Í Ÿ¿¬±¸ÀÚµéÀÇ ÀÚ·á´Â Àß ÀÏÄ¡ÇÏ¿´´Ù. |
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| A method is presented which enables the computation of the bed-load transport rate as the product of particle velocity and bed-load Concentration. In this study, it is assumed that particle velocity is proportinal to the flow velocity near the particle and the apperance frequency of the component of the fluctuating velocity of turbulent flow close to bed is normally distributed, and the particle velocity is expressed by mean flow velocity near the particle and the function of bed shear stress. Engelund formula, which is checked indirectly to be proper to use in this study, is employed to estimate the effective shear velocity. And the dffective bed shear stress acting on particle is obtained by that shear velocity. Ashida-Michiue's formula is used to get the concentration of bed-load. Experimental data for bed-load is compared with the results of other studies and the transport fornula suggested in this paper gives results which are in good accordance with other's experimental data excepting the results obtained the case of comparatively small bed shear stress. |
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Çѱ¹¼öÀÚ¿øÇÐȸÁö / v.22, no.2, 1989³â, pp.191-200
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1738-9488
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO198911920092708)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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