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Çѱ¹¼öÀÚ¿øÇÐȸ / v.30, no.1, 1997³â, pp.3-13
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°³Á¤ Prand½Ã ÀÌ·ÐÀ» ÀÌ¿ëÇÑ À¯»ç ³óµµ ºÐÆ÷½Ä
( A Sediment Concentration Distribution Based on a Revised Prandtl Mixing Theory ) |
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| ¸è À¯¼Ó ºÐÆ÷¸¦ ±¸Çϱâ À§ÇØ °³Á¤ Prandtl È¥ÇÕ °Å¸® ÀÌ·ÐÀÌ ÀÌ¿ëµÇ¾úÀ¸¸ç, ¿©±â¿¡¼ »ç¿ëµÈ Áö¼ö°ªÀÇ ¹üÀ§´Â 1/4~1/7À̾ú´Ù. ÀÌ °³Á¤µÈ À¯¼ÓºÐÆ÷¸¦ ÀÌ¿ëÇÏ¿© °£´ÜÇÑ ºÎÀ¯»ç ³óµµ ºÐÆ÷½ÄÀ» °³¹ßÇÏ¿´´Ù. ¹Ì±¹ ÁöÁúÁ¶»ç±¹ÀÌ ¸®¿À±×¶õµ¥°¿¡¼ ½ÇÃøÇÑ ÀÚ·á¿Í ¸í¸ñ°ªÀÎ $eta$=1.0, $textsc{k}$=0.4, ±×¸®°í °¡½Ã°ü¿¡ ÀÇÇØ ¾ò¾îÁø ħ°¼Óµµ¸¦ ÀÌ¿ëÇÑ °³Á¤ ³óµµ½Ä °è»ê°á°ú¿Í ½ÇÃøÁö¿ÍÀÇ ºñ±³´Â ¾çÈ£ÇÑ ÆíÀ̾úÀ¸¸ç, Áö¼ö¿¡ ÀÓÀÇ·Î µÎ¹è¸¦ ÇØÁÖ¾úÀ» °æ¿ì¿¡´Â ÁÁÀº °á°ú¸¦ º¸¿´´Ù. Àû´çÇÑ $eta$, $textsc{k}$, ±×¸®°í ħ°¼Óµµ¸¦ ¼±ÅÃÇϱâ À§ÇØ ´õ ¸¹Àº ¿¬±¸°¡ ÇÊ¿äÇÏÁö¸¸ ÀÌ·¯ÇÑ ¿¬±¸°¡ ´ë±Ô¸ð ³·ù¿Í ÀÌÂ÷·ù ¿µÇâ¿¡ ´ëÇÑ ¼³¸íÀ» ÇÒ ¼ö´Â ¾øÀ» °ÍÀÌ´Ù. ÇÏÁö¸¸ ½Ç¿ëÀûÀÎ Ãø¸é¿¡¼ º¸¸é ¾î´À °üÃøÁöÁ¡¿¡ ´ëÇÑ ¸Å¿ì ÀÚ¼¼ÇÏ°í Æ¯º°ÇÏ°Ô ÃøÁ¤µÈ ÀÚ·á´Â ±× ÁöÁ¡¿¡ ¸Â´Â Áö¼ö³ª °è¼ö¸¦ ã¾Æ³¾ ¼öµµ ÀÖ´Ù. |
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| Modifications of Prandtl's mixing length theory were used to obtain a power velocity distribution in which the coefficient and exponent are variable over a range from 1/4 to 1/7. A simple suspended-sediment concentration distribution was developed which can be associated with this modified velocity distribution. Using nominal values of ${eta}$=1.0, $kappa$=0.4 and visual accumulation tube values of fall velocity, the comparison between theory and field measurements by the USGS on the Rio Grande is fair. Doubling the value of the exponent results in a good comparison. Further research is needed to be able to better choose ${eta}$, $kappa$, and fall velocity values, but such research will not be able to account for the effects of large-scale turbulence and secondary flows. In a pragmatic sense, a special set of fairly detailed measurements can establish coefficients and exponents for any gaging site. |
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Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.30, no.1, 1997³â, pp.3-13
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199711920099985)
¾ð¾î : ¿µ¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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